Search for chameleon-like scalar fields with the ammonia method (2009)
Levshakov, S. A., Molaro, P., Lapinov, A. V., Reimers, D., Henkel, C., Sakai, T.
(Abridged) The ammonia method, recently proposed to explore the electron-to-proton mass ratio, mu = m_e/m_p, is applied to nearby dark clouds in the Milky Way. This ratio, being measured in...
Thermal effects in the magnetic Casimir-Polder interaction (2009)
Haakh, H., Intravaia, F., Henkel, C.
We investigate the magnetic dipole coupling between a metallic surface and an atom in a thermal state, ground state and excited hyperine state. This interaction results in a repulsive correction and...
Temperature dependence of the magnetic Casimir-Polder interaction (2009)
Haakh, H., Intravaia, F., Henkel, C., Spagnolo, S., Passante, R., Power, B., ...
We analyze the magnetic dipole contribution to atom-surface dispersion forces. Unlike its electrical counterpart, it involves small transition frequencies that are comparable to thermal energy...
Optical BCS conductivity with arbitrary purity at imaginary frequencies (2009)
Bimonte, G., Haakh, H., Henkel, C., Intravaia, F.
We present an efficient expression for the analytic continuation to arbitrary complex frequencies of the complex optical and AC conductivity of a homogeneous superconductor with arbitrary mean free...
Henkel, C., Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, V. V., Braatz, J. A., ...
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS 1830–211, which is by far the best known...
New H2O masers in Seyfert and FIR bright galaxies. III. The Southern Sample (2009)
Surcis, G., Tarchi, A., Henkel, C., Ott, J., Lovell, J., Castangia, P.
Recently, a relationship between the water maser detection rate and far infrared (FIR) flux densities has been established as a result of two 22 GHz maser surveys in a complete sample of galaxies...
Henkel, C., Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, V. V., Braatz, J. A., ...
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS1830-211. Obtaining average radial velocities...
Discovery of a bright radio transient in M82: a new radio supernova? (2009)
Brunthaler, A., Menten, K. M., Reid, M. J., Henkel, C., Bower, G. C., Falcke, H.
In this Letter, we report the discovery of a new bright radio transient in M82. Using the Very Large Array, we observed the nuclear region of M82 at several epochs at 22 GHz and detected a new bright...
Lo, N., Cunningham, M. R., Jones, P. A., Bains, I., Burton, M. G., Wong, T., ...
We present multi-molecular line maps obtained with the Mopra Telescope towards the southern giant molecular cloud (GMC) complex G333, associated with the HII region RCW 106. We have characterised the...
Evidence of a pure starburst nature of the nuclear region of NGC 253 (2009)
Brunthaler, A., Castangia, P., Tarchi, A., Henkel, C., Reid, M. J., Falcke, H., ...
We present high-resolution spectral line and continuum VLBI and VLA observations of the nuclear region of NGC 253 at 22 GHz. While the water vapor masers in this region were detected on arcsecond and...
Properties of the Molecular Gas in Starburst Galaxies and AGN (2009)
Mühle, S., Seaquist, E. R., Henkel, C.
There is growing evidence that the properties of the molecular gas in the nuclei of starburst galaxies and in AGN may be very different from those seen in Galactic star forming regions and that a...
Espada, D., Matsushita, S., Peck, A., Henkel, C., Iono, D., Israel, F. P., ...
We present high resolution images of the 12CO(2-1) emission in the central 1' (1 kpc) of NGC 5128 (Centaurus A), observed using the SMA. We elucidate for the first time the distribution and...
A gravitationally lensed water maser in the early Universe (2009)
Impellizzeri, C. M. V., McKean, J. P., Castangia, P., Roy, A. L., Henkel, C., Brunthaler, A., ...
Water masers are found in dense molecular clouds closely associated with supermassive black holes in the centres of active galaxies. Based upon the understanding of the local water maser luminosity...
New H2O masers in Seyfert and FIR bright galaxies III. The southern sample (2009)
Surcis, G, Tarchi, A, Henkel, C, Ott, J, Lovell, JEJ, Castangia, P
Context. A relationship between the water maser detection rate and far infrared (FIR) flux densities was established as a result of two 22 GHz maser surveys in a complete sample of galaxies ( ) with...
The Megamaser Cosmology Project: I. VLBI observations of UGC 3789 (2008)
Reid, M. J., Braatz, J. A., Condon, J. J., Greenhill, L. J., Henkel, C., Lo, K. Y.
The Megamaser Cosmology Project (MCP) seeks to measure the Hubble Constant (Ho) in order to improve the extragalactic distance scale and constrain the nature of dark energy. We are searching for...
Properties of the molecular gas in a starbursting QSO at z = 1.83 in the COSMOS field (2008)
Aravena, M., Bertoldi, F., Schinnerer, E., Weiss, A., Jahnke, K., Carilli, C. L., ...
Using the IRAM 30 m telescope, we have detected the 12CO J = 2−1, 4−3, 5−4, and 6−5 emission lines in the millimeter-bright, blank-field selected AGN COSMOS J100038+020822 at redshift z =...
Experimental and theoretical challenges for the trapped electron quantum computer (2008)
Marzoli, I., Tombesi, P., Ciaramicoli, G., Werth, G., Bushev, P., Stahl, S., ...
We discuss quantum information processing with trapped electrons. After recalling the operation principle of planar Penning traps we sketch the experimental conditions to load, cool and detect single...
The CO line SED and atomic carbon in IRAS F10214+4724 (2008)
Ao, Y., Weiss, A., Downes, D., Walter, F., Henkel, C., Menten, K. M.
Using the IRAM 30m telescope and the Plateau de Bure interferometer we have detected the \ctwo and the CO 3$-$2, 4$-$3, 6$-$5, 7$-$6 transitions as well as the dust continuum at 3 and 1.2 mm towards...
Menten, K. M., Guesten, R., Leurini, S., Thorwirth, S., Henkel, C., Klein, B., ...
Using the Atacama Pathfinder Experiment (APEX) telescope we have detected the rotational ground-state transitions of ortho-ammonia and ortho-water toward the redshift ~0.89 absorbing galaxy in the...
Abundances and Isotope Ratios in the Magellanic Clouds: The Star Forming Environment of N113 (2008)
Wang, M., Henkel, C., Whiteoak, J. B., Cunningham, M.
With the goal of deriving the physical and chemical conditions of star forming regions in the Large Magellanic Cloud (LMC), a spectral line survey of the prominent star forming region N113 is...
Henkel, C., Braatz, J. A., Menten, K. M., Ott, J.
Using the Green Bank Telescope (GBT), we have detected the (J,K) = (1,1) to (10,10) ammonia inversion lines, up to 1030 K above the ground state, in a face-on spiral galaxy viewed against the radio...
Magnetic interactions of cold atoms with anisotropic conductors (2008)
David, T., Japha, Y., Dikovsky, V., Salem, R., Henkel, C., Folman, R.
We analyze atom-surface magnetic interactions on atom chips where the magnetic trapping potentials are produced by current carrying wires made of electrically anisotropic materials. We discuss a...
Galactic interstellar 18O/17O ratios - a radial gradient? (2008)
Wouterloot, J. G. A., Henkel, C., Brand, J., Davis, G. R.
(Abridged) Our aim is to determine 18O/17O abundance ratios across the entire Galaxy. These provide a measure of the amount of enrichment by high-mass versus intermediate-mass stars. Such ratios,...
Microscopic atom optics: from wires to an atom chip (2008)
Folman, R., Kruger, P., Schmiedmayer, J., Denschlag, J., Henkel, C.
We give a comprehensive overview of the development of micro traps, from the first experiments on guiding atoms using current carrying wires in the early 1990's to the creation of a BEC on an atom...
6.7 GHz methanol absorption toward the Seyfert 2 galaxy NGC 3079 (2008)
Impellizzeri, C. M. V., Henkel, C., Roy, A. L., Menten, K. M.
The detection of the 6.7 GHz line of methanol (CH3OH) is reported for the first time toward an object beyond the Magellanic Clouds. Using the Effelsberg 100 m telescope, two absorption features were...
A high-sensitivity 6.7 GHz methanol maser survey toward H2O sources (2008)
Xu, Y., Li, J. J., Hachisuka, K., Pandian, J. D., Menten, K. M., Henkel, C.
We present the results of a high sensitivity survey for 6.7 GHz methanol masers towards 22 GHz water maser using the 100 m Efflesberg telescope. A total of 89 sources were observed and 10 new...
Properties of the molecular gas in a starbursting QSO at z = 1.83 in the COSMOS field (2008)
Aravena, M., Bertoldi, F., Schinnerer, E., Weiss, A., Jahnke, K., Carilli, C. L., ...
The CO line SED and atomic carbon in IRAS F10214+4724 (2008)
Ao, Y., Weiß, A., Downes, D., Walter, F., Henkel, C., Menten, K. M.
Using the IRAM 30 m telescope and the Plateau de Bure interferometer we have detected the CI(^3P2 to ^3P1) and the CO 3-2, 4-3, 6-5, 7-6 transitions as well as the dust continuum at 3 and 1.2 mm...
Properties of the molecular gas in a starbursting QSO at z = 1.83 in the COSMOS field (2008)
Aravena, M., Bertoldi, F., Schinnerer, E., Weiss, A., Jahnke, K., Carilli, C. L., ...
Using the IRAM 30 m telescope, we have detected the 12CO J=2-1, 4-3, 5-4, and 6-5 emission lines in the millimeter-bright, blank-field selected AGN COSMOS J100038+020822 at redshift z = 1.8275. The...
New water masers in Seyfert and FIR bright galaxies. II (2007)
Castangia, P., Tarchi, A., Henkel, C., Menten, K. M.
Recently, a relationship between the water maser detection rate and far infrared (FIR) flux density has been found as a result of a 22 GHz maser survey in a sample comprised of northern galaxies with...
ASTRONOMY AND ASTROPHYSICS (2007)
C. Henkel, H. Falcke, J. A. Braatz
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
Heating of Trapped Atoms Near Thermal Surfaces (2007)
Henkel And, C. Henkel, M. Wilkens
We study the electromagnetic coupling and concomitant heating of a particle in a miniaturized trap close to a solid surface. Two dominant heating mechanisms are identified: proximity fields generated...
Molecular abundances in the Magellanic Clouds (2007)
C. Henkel, T. J. Millar, J. B. Whiteoak
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
Molecular abundances in the Magellanic Clouds (2007)
C. Henkel, J. B. Whiteoak, M. R. Hunt
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
Molecular abundances in the Magellanic Clouds II. Deuterated species in the LMC (2007)
C. Henkel, J. B. Whiteoak, R. Mauersberger
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
S. Huttemeister, G. Dahmen, R. Mauersberger, C. Henkel
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
XI. H 2 CO and CH 3 OH: Molecular abundances and physical conditions (2007)
S. Huttemeister, R. Mauersberger, C. Henkel
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
S. Huttemeister, C. Henkel, R. Mauersberger, N. Brouillet, T. Wiklind, T. J. Millar
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
Between H, G. B. Taylor, A. B. Peck, C. Henkel, H. Falcke, C. G. Mundell, ...
We report on the discovery of H i in absorption toward the gigamaser galaxy TXS 2226-184 using the VLA. The absorption appears to consist of two components { one with a width of 125 km s , and one...
A Flaring Megamaser in Mrk 348 (2007)
A. B. Peck, H. Falcke, C. Henkel, K. M. Menten, Y. Hagiwara, A Flaring, ...
We report new observations of the H 2 O megamaser in the Seyfert 2 galaxy Mrk 348. Following our initial detection in 2000 March using the Eelsberg 100 m telescope, re-analysis of previous data on...
Casimir interaction between absorbing and meta Materials (2007)
We investigate the Casimir energy between two dissipative mirrors in term of a sum over mode formula which can be interpreted by analogy to a quantum dissipative oscillator. We also show that...
Casimir energy and entropy between dissipative mirrors (2007)
We discuss the Casimir effect between two identical, parallel slabs, emphasizing the role of dissipation and temperature. Starting from quite general assumptions, we analyze the behavior of the...
Dense gas in luminous infrared galaxies (2007)
Baan, W. A., Henkel, C., Loenen, A. F., Baudry, A., Wiklind, T.
Molecules that trace the high-density regions of the interstellar medium have been observed in (ultra-)luminous (far-)infrared galaxies, in order to initiate multiple-molecule multiple-transition...
The Circumnuclear Molecular Gas in the Seyfert Galaxy NGC4945 (2007)
Chou, Richard C. Y., Peck, A. B., Lim, J., Matsushita, S., Muller, S., Sawada-Satoh, S., ...
We have mapped the central region of NGC 4945 in the $J=2\to1$ transition of $^{12}$CO, $^{13}$CO, and C$^{18}$O, as well as the continuum at 1.3 mm, at an angular resolution of $5\farc \times...
The innermost region of the water megamaser radio galaxy 3C403 (2007)
Tarchi, A., Brunthaler, A., Henkel, C., Menten, K. M., Braatz, J., Weiss, A.
The standard unified scheme of active galactic nuclei requires the presence of high column densities of gas and dust potentially obscuring the central engine. So far, few direct subarcsecond...
Galactic Edge Clouds I: Molecular Line Observations and Chemical Modelling of Edge Cloud 2 (2007)
Ruffle, P. M. E., Millar, T. J., Roberts, H., Lubowich, D. A., Henkel, C., Pasachoff, J. M., ...
Edge Cloud 2 (EC2) is a molecular cloud, about 35 pc in size, with one of the largest galactocentric distances known to exist in the Milky Way. We present observations of a peak CO emission region in...
Proper Motions in the Andromeda Subgroup (2007)
Brunthaler, A., Reid, M. J., Falcke, H., Henkel, C., Menten, K. M.
This article presents results of VLBI observations of regions of H2O maser activity in the Local Group galaxies M33 and IC10. Since all position measurements were made relative to extragalactic...
Formaldehyde as a Tracer of Extragalactic Molecular Gas I. Para-H_2CO Emission From M 82 (2007)
Mühle, S., Seaquist, E. R., Henkel, C.
Using the IRAM 30-m telescope and the 15-m JCMT, we explore the value of para-formaldehyde (p-H_2CO) as a tracer of density and temperature of the molecular gas in external galaxies. The target of...
Redshifted formaldehyde from the gravitational lens B0218+357 (2007)
Jethava, N., Henkel, C., Menten, K. M., Carilli, C. L., Reid, M. J.
The gravitational lens toward B0218+357 offers the unique possibility to study cool moderately dense gas with high sensitivity and angular resolution in a cloud that existed half a Hubble time ago....
Sobolev, A. M., Cragg, D. M., Ellingsen, S. P., Gaylard, M. J., Goedhart, S., Henkel, C., ...
General characteristics of methanol (CH3OH) maser emission are summarized. It is shown that methanol maser sources are concentrated in the spiral arms. Most of the methanol maser sources from the...
The Role of Surface Plasmons in The Casimir Effect (2007)
Intravaia, F., Henkel, C., Lambrecht, A.
In this paper we study the role of surface plasmon modes in the Casimir effect. The Casimir energy can be written as a sum over the modes of a real cavity and one may identify two sorts of modes, two...
Laser theory in manifest Lindblad form (2007)
We discuss the laser theory for a single-mode laser with nonlinear gain. We focus in particular on a micromaser which is pumped with a dilute beam of excited atoms crossing the laser cavity. In the...
Zhang, J. S., Henkel, C., Mauersberger, R., Menten, K. M., Tieftrunk, A. R., ...
Using the 15-m Swedish ESO Sub-millimeter Telescope (SEST), CO, HCN, and HCO+ observations of the galactic star-forming region NGC6334 FIR II are presented, complemented by [C I] 3^P_1--3^P_0 and...
Highly-excited CO emission in APM08279+5255 at z=3.9 (2007)
Weiss, A., Downes, D., Neri, R., Walter, F., Henkel, C., Wilner, D. J., ...
We report the detection of the CO 4-3, 6-5, 9-8, 10-9, and 11-10 lines in the Broad Absorption Line quasar APM08279+5255 at z=3.9 using the IRAM 30m telescope. We also present IRAM PdBI high spatial...
The interstellar medium of the Antennae Galaxies (2007)
Schulz, A., Henkel, C., Muders, D., Mao, R. Q., Roellig, M., Mauersberger, R.
To study the properties of the interstellar medium in the prototypical merging system of the Antennae galaxies (NGC 4038 and NGC 4039), we have obtained CO(1-0), (2-1) and (3-2) line maps, as well as...
Highly-excited CO emission in APM 08279+5255 at z = 3.9 (2007)
Weiß, A., Downes, D., Neri, R., Walter, F., Henkel, C., Wilner, D. J., ...
We report the detection of the CO 4-3, 6-5, 9-8, 10-9, and 11-10 lines in the Broad Absorption Line quasar APM 08279+5255 at z=3.9 using the IRAM 30 m telescope. We also present IRAM PdBI high...
CO line SEDs of high-redshift QSOs and submm galaxies (2007)
Weiss, A., Downes, D., Walter, F., Henkel, C.
Observations of multiple CO transitions provide a unique tool for constraining the excitation conditions of the molecular gas in high-redshift objects. We present the first results of our ongoing...
CO(1--0) emission from quasar host galaxies beyond redshift 4 (2007)
Riechers, D. A., Walter, F., Carilli, C. L., Knudsen, K. K., Lo, K. Y., Benford, D. J., ...
Molecular gas has now been detected in 15 z > 2 QSOs through observations of high-J CO transitions using millimeter interferometers. Observations of the CO ground-state transition CO(1--0), however,...
Detecting low-order CO emission from z >4 quasar host galaxies (2007)
Riechers, D. A., Walter, F., Carilli, C. L., Knudsen, K. K., Lo, K. Y., Benford, D. J., ...
Not Available
Towards a kinematic model of the Local Group (2006)
Brunthaler, A., Reid, M. J., Falcke, H., Henkel, C., Menten, K. M.
Measuring the proper motions and geometric distances of galaxies within the Local Group is very important for our understanding of the history, present state and future of the Local Group. Currently,...
The water megamaser in the merger system Arp299 (2006)
Tarchi, A., Castangia, P., Henkel, C., Menten, K. M.
We present preliminary results of an interferometric study of the water megamaser in the merger system Arp299. This system is composed of two main sources: IC694 and NGC3690. There is clear evidence...
The Proper Motion of the Local Group Galaxy IC 10 (2006)
Brunthaler, A., Reid, M. J., Falcke, H., Henkel, C., Menten, K. M.
We have measured the proper motion of the Local Group galaxy IC 10 with the Very Long Baseline Array by measuring the position of an H2O maser relative to two background quasars over 4.3 years. After...
The detection of the (J,K)=(18,18) line of NH3 (2006)
Wilson, T. L., Henkel, C., Huettemeister, S.
The first astronomical detection of the metastable ($J,K$) = (18,18) line of NH3 is reported. With 3130 K above the ground state, this is the NH3 line with by far the highest energy detected in...
Water masers in the Local Group of galaxies (2006)
Brunthaler, A., Henkel, C., Reid, M. J., Greenhill, L. J., Falcke, H.
We compare the number of detected 22 GHz H2O masers in the Local Group galaxies M31, M33, NGC6822, IC10, IC1613, DDO187, GR8, NGC185, and the Magellanic Clouds with the water maser population of the...
A 2 mm spectral line survey of the starburst galaxy NGC 253 (2006)
Martín, S., Mauersberger, R., Martín-Pintado, J., Henkel, C., García-Burillo, S.
We present the first unbiased molecular line survey towards an extragalactic source, namely the nuclear region of the starburst galaxy NGC 253. The scan covers the frequency band from 129.1 to 175.2...
Extragalactic H_2O masers and X-ray absorbing column densities (2005)
Zhang, J. S., Henkel, C., Kadler, M., Greenhill, L. J., Nagar, N., Wilson, A. S., ...
Having conducted a search for the 22 GHz water vapor line towards galaxies with nuclear activity, large nuclear column densities or high infrared luminosities, we present H_2O spectra for NGC2273,...
Optical microscopy via spectral modifications of a nano-antenna (2005)
Kalkbrenner, T., Hakanson, U., Schädle, A., Burger, S., Henkel, C., Sandoghdar, V.
The existing optical microscopes form an image by collecting photons emitted from an object. Here we report on the experimental realization of microscopy without the need for direct optical...
Henkel, C., Jethava, N., Kraus, A., Menten, K. M., Carilli, C. L., Grasshoff, M., ...
Using the Effelsberg 100-m telescope, absorption in the (J,K) = (1,1), (2,2) and (3,3) inversion lines of ammonia (NH_3) was detected at a redshift of z = 0.6847 toward the gravitational lens system...
Multiple CO lines in SMM J16359+6612 -- Further evidence for a merger (2005)
Weiss, A., Downes, D., Walter, F., Henkel, C.
Using the IRAM 30m telescope, we report the detection of the CO(3--2), CO(4--3), CO(5--4) and CO(6--5) lines in the gravitational lensed submm galaxy SMM J16359+6612 at z=2.5. The CO lines have a...
High-excitation CO in a quasar host galaxy at z=6.42 (2005)
Bertoldi, F., Cox, P., Neri, R., Carilli, C. L., Walter, F., Omont, A., ...
We report the detection of high excitation CO emission from the most distant quasar currently known, SDSS J114816.64+525150.3 (hereafter J1148+5251), at a redshift z=6.419. The CO (J=6-5) and (J=7-6)...
Reduction of Magnetic Noise in Atom Chips by Material Optimization (2005)
Dikovsky, V., Japha, Y., Henkel, C., Folman, R.
We discuss the contribution of the material type in metal wires to the electromagnetic fluctuations in magnetic microtraps close to the surface of an atom chip. We show that significant reduction of...
New H2O masers in Seyfert and FIR bright galaxies (2005)
Henkel, C., Peck, A. B., Tarchi, A., Nagar, N. M., Braatz, J. A., Castangia, P., ...
Extragalactic water vapor masers with 50, 1000, 1, and 230 solar (isotropic) luminosities were detected toward Mrk1066 (UGC2456), Mrk34, NGC3556 and Arp299, respectively. The interacting system...
The Geometric Distance and Proper Motion of the Triangulum Galaxy (M33) (2005)
Brunthaler, A., Reid, M. J., Falcke, H., Greenhill, L. J., Henkel, C.
We measured the angular rotation and proper motion of the Triangulum Galaxy (M33) with the Very Long Baseline Array by observing two H2O masers on opposite sides of the galaxy. By comparing the...
Casimir force between designed materials: What is possible and what not (2005)
We establish strict upper limits for the Casimir interaction between multilayered structures of arbitrary dielectric or diamagnetic materials. We discuss the appearance of different power laws due to...
Parsec-scale water maser structure in TXS 2226-184 (2005)
Ball, G. H., Greenhill, L. J., Moran, J. M., Zaw, I., Henkel, C.
The 2 mm line survey of the starburst galaxy NGC 253 : sulfur chemistry (2005)
Martín-Pintado, J., Mauersberger, R., Henkel, C., García-Burillo, S.
Properties and environment of the molecular complex near Holmberg IX (2005)
Boone, F., Brouillet, N., Hüttemeister, S., Henkel, C., Braine, J., Bomans, D. J., ...
The geometric distance and proper motion of the Triangulum Galaxy (M33) (2005)
Brunthaler, A., Reid, M. J., Falcke, H., Greenhill, L. J., Henkel, C.
H2O megamasers : Accretion disks, jet interaction, outflows or massive star formation? (2005)
Henkel, C., Braatz, J. A., Tarchi, A., Peck, A. B., Nagar, N. M., Greenhill, L. J., ...
New H2O masers in Seyfert and FIR bright galaxies (2005)
Henkel, C., Peck, A. B., Tarchi, A., Nagar, N. M., Braatz, J. A., Castangia, P., ...
Deuterium nucleosynthesis in AGN : Is D cosmological? (2005)
Lubowich, D. A., Kuno, N., Roberts, H., Millar, T. J., Henkel, C., Pasachoff, J., ...
Sulfur chemistry and isotopic ratios in the starburst galaxy NGC 253 (2005)
Martin, S., Martin-Pintado, J., Mauersberger, R., Henkel, C., Garcia-Burillo, S.
Probing the obscuring medium around active nuclei using masers : The case of 3C 403 (2005)
Tarchi, A., Henkel, C., Chiaberge, M., Menten, K. M., Brunthaler, A., Moscadelli, L.
Multiple CO lines in SMM J16359+6612 - further evidence for a merger (2005)
Weiß, A., Downes, D., Walter, F., Henkel, C.
Using the IRAM 30 m telescope, we report the detection of the CO(3-2), CO(4-3), CO(5-4) and CO(6-5) lines in the gravitational lensed submm galaxy SMM J16359+6612 at z=2.5. The CO lines have a double...
CO and CI at redshift 2.5 (2005)
Weiß, A., Downes, D., Henkel, C., Walter, F.
We report on the first results of an in depth study of the molecular gas properties in three high-redshift sources: IRAS FSC 10214 (z = 2.3), SMMJ14011+0252 (z = 2.5) and H1413+117 (Cloverleaf...
Atomic carbon at redshift ~2.5 (2005)
Weiß, A., Downes, D., Henkel, C., Walter, F.
Using the IRAM 30 m telescope we detected the lower fine structure line of neutral carbon (CI(3P1\to3P0), nurest = 492 GHz) towards three high-redshift sources: IRAS FSC 10214 (z=2.3), SMM...
A Green Bank Telescope Search for Water Masers in Nearby Active Galactic Nuclei (2004)
Braatz, J. A., Henkel, C., Greenhill, L. J., Moran, J. M., Wilson, A. S.
Using the Green Bank Telescope, we have conducted a survey for 1.3 cm water maser emission toward the nuclei of nearby active galaxies, the most sensitive large survey for H2O masers to date. Among...
Fuente, A., Rizzo, J. R., Caselli, P., Bachiller, R., Henkel, C.
We have carried out a molecular survey of the Class 0 IM protostar NGC 7129 -- FIRS 2 (hereafter FIRS 2) and the Herbig Be star LkH$\alpha$ 234 with the aim of studying the chemical evolution of the...
Ground based terahertz CO spectroscopy towards Orion (2004)
Kawamura, J., Hunter, T., Tong, C., Blundell, R., Papa, D., Patt, F., ...
Sulfur chemistry and isotopic ratios in the starburst galaxy NGC 253 (2004)
Martín, S., Martín-Pintado, J., Mauersberger, R., Henkel, C., García-Burillo, S.
Based on observations of the most abundant sulfur-bearing molecules (H2S, CS, NS, SO, H2CS, OCS, and SO2) carried out with the IRAM 30m telescope and SEST, we present the first analysis of the sulfur...
The interstellar C18O/C17O ratio in the solar neighbourhood: The rho Oph cloud (2004)
Wouterloot, J. G. A., Brand, J., Henkel, C.
Observations of up to ten carbon monoxide (CO and isotopomers) transitions are presented to study the interstellar C18O/C17O ratio towards 21 positions in the nearby (d~140pc) low-mass star forming...
Atomic carbon at redshift ~2.5 (2004)
Weiss, A., Downes, D., Henkel, C., Walter, F.
Using the IRAM 30m telescope we detected the lower fine structure line of neutral carbon towards three high--redshift sources: IRAS FSC10214 (z=2.3), SMMJ14011+0252 (z=2.5) and H1413+117 (Cloverleaf...
Disks, Tori, and Cocoons: Emission and Absorption Diagnostics of AGN Environments (2004)
Morganti, R., Greenhill, L. J., Peck, A. B., Jones, D. L., Henkel, C.
One of the most important problems in the study of active galaxies is understanding the detailed geometry, physics, and evolution of the central engines and their environments. The leading models...
Atomic diffraction by a thin phase grating (2004)
We present a semiclassical perturbation method for the description of atomic diffraction by a weakly modulated potential. It proceeds in a way similar to the treatment of light diffraction by a thin...
A modulated mirror for atomic interferometry (2004)
Henkel, C., Steane, A. M., Kaiser, R., Dalibard, J.
A novel atomic beam splitter, using reflection of atoms off an evanescent light wave, is investigated theoretically. The intensity or frequency of the light is modulated in order to create sidebands...
Properties and environment of the molecular complex near Holmberg IX (2004)
Boone, F., Brouillet, N., Huettemeister, S., Henkel, C., Braine, J., Bomans, D. J., ...
This paper is aimed at providing new insight into the nature and origin of the molecular complex situated near the line of sight toward Holmberg IX in the M81 group of galaxies. The first high...
Probing the obscuring medium around active nuclei using masers: The case of 3C403 (2004)
Tarchi, A., Henkel, C., Chiaberge, M., Menten, K. M., Brunthaler, A., Moscadelli, L.
We report the first detection of a water megamaser in a radio-loud galaxy, 3C403, and present a follow-up study using the VLA. 3C403 has been observed as a part of a small sample of FRII galaxies...
H2O megamasers: Accretion disks, jet interaction, outflows or massive star formation? (2004)
Henkel, C., Braatz, J. A., Tarchi, A., Peck, A. B., Nagar, N. M., Greenhill, L. J., ...
The 25 years following the serendipitous discovery of megamasers have seen tremendous progress in the study of luminous extragalactic H$_2$O emission. Single-dish monitoring and high resolution...
The abundance of 36S in IRC+10216 and its production in the Galaxy (2004)
Mauersberger, R., Ott, U., Henkel, C., Cernicharo, J., Gallino, R.
The J=2-1 and 3-2 rotational lines of the rare isotopomer C36S and the J=5-4 and 6-5 transitions of Si36S were detected in the carbon star IRC+10216 (CW Leo). These are the first detections of 36S...
The abundance of 36S in IRC+10216 and its production in the Galaxy (2004)
Gallino, R., Cernicharo, José, Henkel, C., Ott, U., Mauersberger, R.
The J=2-1 and 3-2 rotational lines of the rare isotopomer C36S and the J=5-4 and 6-5 transitions of Si36S were detected in the carbon star IRC+10216 (CW Leo). These are the first detections of 36S...
Dense gas in nearby galaxies XVI. The nuclear starburst environment in NGC4945 (2004)
Wang, M., Henkel, C., Whiteoak, J., Cunningham, M., Mauersberger, R., ...
A multi-line millimeter-wave study of the nearby starburst galaxy NGC 4945 has been carried out using the Swedish-ESO Submillimeter Telescope (SEST). The study covers the frequency range from 82 GHz...
A Masing Molecular Cloud in the Central Parsecs of Mrk348 (2004)
Peck, A. B., Henkel, C., Ulvestad, J. S.
We report new observations of the H_2O megamaser in the Seyfert 2 galaxy Mrk348. The line is redshifted by about 130 km s^-1 with respect to the systemic velocity, is extremely broad, with a FWHM of...
The abundance of 36S in IRC+10216 and its production in the Galaxy (2004)
Mauersberger, R., Ott, U., Henkel, C., Cernicharo, J., Gallino, R.
A Green Bank Telescope search for water masers in nearby active galactic nuclei (2004)
Braatz, J. A., Henkel, C., Greenhill, L. J., Moran, J. M., Wilson, A. S.
The abundance of S-36 in IRC+10216 and its production in the Galaxy (2004)
Mauersberger, R., Ott, U., Henkel, C., Cernicharo, J., Gallino, R.
Dense gas in nearby galaxies - XVI. The nuclear starburst environment in NGC 4945 (2004)
Wang, M., Henkel, C., Chin, Y. N., Whiteoak, J. B., Hunt Cunningham, M., Mauersberger, R., ...
Disks, Tori, and Cocoons : emission and absorption diagnostics of AGN environments (2004)
Morganti, R., Greenhill, L. J., Peck, A. B., Jones, D. L., Henkel, C.
Extragalactic water masers in bright IRAS sources (2004)
Tarchi, A., Henkel, C., Peck, A. B., Nagar, N., Moscadelli, L., Menten, K. M.
Optical discrimination between spatial decoherence and thermalization of a massive object (2003)
Henkel, C., Nest, M., Domokos, P., Folman, R.
We propose an optical ring interferometer to observe environment-induced spatial decoherence of massive objects. The object is held in a harmonic trap and scatters light between degenerate modes of a...
Water vapor in the starburst galaxy NGC 253: A new nuclear maser? (2003)
Henkel, C., Tarchi, A., Menten, K. M., Peck, A. B.
22 GHz water vapor emission was observed toward the central region of the spiral starburst galaxy NGC 253. Monitoring observations with the 100-m telescope at Effelsberg and measurements with the BnC...
First detections of extragalactic SO2, NS and NO (2003)
Martin, S., Mauersberger, R., Martin-Pintado, J., Garcia-Burillo, S., Henkel, C.
We report the first detections of SO_2, NS and NO in an extragalactic source, the nucleus of the starburst galaxy NGC 253. Five SO_2 transitions, three groups of hyperfine components of NO and five...
Extragalactic water masers in bright IRAS sources (2003)
Tarchi, A., Henkel, C., Peck, A. B., Nagar, N., Moscadelli, L., Menten, K. M.
We report the results of a search for 22 GHz water maser emission in IRAS-bright galaxies, using the 100-m Effelsberg telescope. In particular, we present the details of four new maser detections...
Gas and Dust in the Cloverleaf Quasar at Redshift 2.5 (2003)
Weiss, A., Henkel, C., Downes, D., Walter, F.
We observed the upper fine structure line of neutral carbon, CI(2-1), the CO(3-2) line and the 1.2mm continuum emission from H1413+117 (Cloverleaf quasar, z=2.5) using the IRAM interferometer....
High-excitation CO in a quasar host galaxy at z=6.42 (2003)
Bertoldi, F., Cox, P., Neri, R., Carilli, C. L., Walter, F., Omont, A., ...
We report the detection of high excitation CO emission from the most distant quasar currently known, SDSS J114816.64+525150.3 (hereafter J1148+5251), at a redshift z=6.419. The CO (J=6-5) and (J=7-6)...
Discovery of a luminous water megamaser in the FRII radiogalaxy 3C403 (2003)
Tarchi, A., Henkel, C., Chiaberge, M., Menten, K. M.
We report the first detection of a water megamaser in a radio-loud galaxy, 3C403. This object has been observed as part of a small sample of FRIIs with evidence of nuclear obscuration. The isotropic...
The Flaring H2O Megamaser and Compact Radio Source in Mrk 348 (2003)
Peck, A. B., Henkel, C., Ulvestad, J. S., Brunthaler, A., Falcke, H., Elitzur, M., ...
We report on single-dish monitoring and extremely high angular resolution observations of the flaring H2O megamaser in the Seyfert 2 galaxy Mrk 348. The H2O line is redshifted by ~130 km/s with...
Dense gas in nearby galaxies: XV. Hot ammonia in NGC253, Maffei2 and IC342 (2003)
Mauersberger, R., Henkel, C., Weiss, A., Peck, A. B., Hagiwara, Y.
The detection of NH3 inversion lines up to the (J,K)=(6,6) level is reported toward the central regions of the nearby galaxies NGC253, Maffei2, and IC342. The observed lines are up to 406K (for...
A Survey for H2O Megamasers III. Monitoring Water Vapor Masers in Active Galaxies (2003)
Braatz, J. A., Wilson, A. S., Henkel, C., Gough, R., Sinclair, M.
We present single-dish monitoring of the spectra of 13 extragalactic water megamasers taken over a period of 9 years and a single epoch of sensitive spectra for 7 others. Our data include the first...
Phase shifts of atomic de Broglie waves at an evanescent wave mirror (2003)
Henkel, C., Kaiser, R., Westbrook, C., Aspect, A.
A detailed theoretical investigation of the reflection of an atomic de Broglie wave at an evanescent wave mirror is presented. The classical and the semiclassical descriptions of the reflection...
High-excitation CO in a quasar host galaxy at z=6.42 (2003)
Bertoldi, F., Cox, P., Neri, R., Carilli, C. L., Walter, F., Omont, A., ...
We report the detection of high excitation CO emission from the most distant quasar currently known, SDSS J114816.64+525150.3 (hereafter J1148+5251), at a redshift z=6.419. The CO (J=6-5) and (J=7-6)...
High-excitation CO in a quasar host galaxy at z=6.42 (2003)
Bertoldi, F., Cox, P., Neri, R., Carilli, C. L., Walter, F., Omont, A., ...
We report the detection of high excitation CO emission from the most distant quasar currently known, SDSS J114816.64+525150.3 (hereafter J1148+5251), at a redshift z=6.419. The CO (J=6-5) and (J=7-6)...
A survey for H2O megamasers. III. Monitoring water vapor masers in active galaxies (2003)
Braatz, J. A., Wilson, A. S., Henkel, C., Gough, R., Sinclair, M.
We present single-dish monitoring of the spectra of 13 extragalactic water megamasers taken over a period of 9 years and a single epoch of sensitive spectra for seven others. The primary motivation...
Dense gas in nearby galaxies - XV. Hot ammonia in NGC 253, Maffei 2 and IC 342 (2003)
Mauersberger, R., Henkel, C., Weiss, A., Peck, A. B., Hagiwara, Y.
The detection of NH3 inversion lines up to the (J,K) = (6,6) level is reported toward the central regions of the nearby galaxies NGC 253, Maffei 2, and IC 342. The observed lines are up to 406 K (for...
Discovery of a luminous water megamaser in the FR II radiogalaxy 3C 403 (2003)
Tarchi, A., Henkel, C., Chiaberge, M., Menten, K. M.
We report the first detection of a water megamaser in a radio-loud galaxy, 3C 403. This object has been observed as part of a small sample of FR IIs with evidence of nuclear obscuration. The...
First detections of extragalactic SO2, NS and NO (2003)
Martin, S., Mauersberger, R., Martin-Pintado, J., Garcia-Burillo, S., Henkel, C.
We report the first detections of SO2, NS and NO in an extragalactic source, the nucleus of the starburst galaxy NGC 253. Five SO2 transitions, three groups of hyperfine components of NO and five of...
High-excitation CO in a quasar host galaxy at z=6.42 (2003)
Bertoldi, F., Cox, P., Neri, R., Carilli, C. L., Walter, F., Omont, A., ...
We report the detection of high excitation CO emission from the most distant quasar currently known, SDSS J114816.64+525150.3 (hereafter J1148+5251), at a redshift z = 6.419. The CO (J = 6 --> 5) and...
Optical emission-line profiles were evaluated in order to explore the structure of galactic nuclei containing H2O megamaser sources. Long-slit spectra of IC 2560, NGC 1386, NGC 1052 and Mrk 1210 were...
The flaring H2O megamaser and compact radio source in Markarian 348 (2003)
Peck, A. B., Henkel, C., Ulvestad, J. S., Brunthaler, A., Falcke, H., Elitzur, M., ...
We report on single-dish monitoring and extremely high angular resolution observations of the flaring H2O megamaser in the Seyfert 2 galaxy Mrk 348. The H2O line is redshifted by similar to130 km...
Optical emission-line profiles were evaluated in order to explore the structure of galactic nuclei containing H2O megamaser sources. Galactic rotation and outflow of narrow-line gas are common...
Discovery of water vapor megamaser emission from Mrk1419 (NGC 2690): An analogue of NGC 4258? (2002)
Henkel, C., Braatz, J. A., Greenhill, L. J., Wilson, A. S.
Water vapor emission at 22 GHz is reported from the nucleus of the LINER galaxy Mrk 1419 (NGC 2960). Single-dish spectra of the maser source show properties that are similar to those seen in NGC...
A high-sensitivity OH 5-cm line survey in late-type stars (2002)
Baudry, A., Sivagnanam, P., Henkel, C.
We have undertaken a comprehensive search for 5-cm excited OH maser emission from evolved stars representative of various stages of late stellar evolution. Observed sources were selected from known...
Towards Proper Motions in the Local Group (2002)
Brunthaler, A., Reid, M., Falcke, H., Greenhill, L. J., Henkel, C.
Key and still largely missing parameters for measuring the mass content and distribution of the Local Group are the proper motion vectors of its member galaxies. The problem when trying to derive the...
Observations of extragalactic masers in bright IRAS sources (2002)
Tarchi, A., Henkel, C., Peck, A. B., Moscadelli, L., Menten, K. M.
We report the first results of an ongoing survey at 22 GHz with the 100-m Effelsberg telescope to search for water maser emission in bright IRAS sources. We have detected water vapor emission in IC...
Tarchi, A., Henkel, C., Peck, A. B., Menten, K. M.
We report the detection of 22 GHz water vapor emission toward the starburst galaxy NGC2146, made using the Effelsberg 100-m telescope. Interferometric observations with the Very Large Array (VLA)...
Molecular Gas and Star Formation in Lynds 870 (2002)
Mao, R. Q., Yang, J., Henkel, C., Jiang, Z. B.
We present molecular line and submillimeter dust continuum observations of the Lynds 870 cloud in the vicinity of IRAS 20231+3440. Two submillimeter cores, SMM1 and SMM2, are identified mapping the...
Red-shifted H2O emission in NGC 3079: more evidence for a pc-scale circumnuclear torus? (2002)
Hagiwara, Y., Henkel, C., Sherwood, W. A., Baan, W. A.
Using the Effelsberg 100-m telescope, sensitive measurements of the H2O megamaser in NGC 3079 are presented. During 2000 - 2001, `high velocity' features are seen that are red-shifted up to 225 km/s...
Taylor, G. B., Peck, A. B., Henkel, C., Falcke, H., Mundell, C. G., O'Dea, C. P., ...
We report on the discovery of HI in absorption toward the gigamaser galaxy TXS2226-184 using the VLA. The absorption appears to consist of two components -- one with a width of 125 km/s, and one...
Water maser emission in IC342 (2002)
Tarchi, A., Henkel, C., Peck, A. B., Menten, K. M.
The detection of 22 GHz water vapor emission from IC342 is reported, raising the detection rate among northern galaxies with 100 micron IRAS point source fluxes > 50 Jy to 16%. The maser, associated...
High-resolution imaging of molecular line emission from high- redshift QSOs (2002)
Carilli, C. L., Kohno, K., Kawabe, R., Ohta, K., Henkel, C., Menten, K. M., ...
We present moderate-(1") and high-resolution (0."2) observations of the CO (2-1) emission at 43 GHz and radio continuum emission at 1.47 GHz from the z = 4.7 QSO BRI 1202- 0725 and the z = 4.4 QSO...
A high-sensitivity OH 5-cm line survey in late-type stars (2002)
Desmurs, J. F., Baudry, A., Sivagnanam, P., Henkel, C.
We have undertaken a comprehensive search for 5-cm excited OH maser emission from evolved stars representative of various stages of late stellar evolution. Observed sources were selected from known...
Monitoring of extragalactic water masers with the MPIfR 100-m telescope (2002)
Hagiwara, Y., Henkel, C., Sherwood, W. A.
We present single-dish monitoring of the 22 GHz water maser lines from the Seyfert 2 galaxies NGC 3079, M 51(NGC 5194), NGC 5793, and the radio galaxy NGC 315 with the Effelsberg 100-m radio...
Red-shifted H2O emission in NGC3079: More evidence for a pc- scale circumnuclear torus? (2002)
Hagiwara, Y., Henkel, C., Sherwood, W. A., Baan, W. A.
Using the Effelsberg 100-m telescope, sensitive measurements of the H2O megamaser in NGC3079 are presented. During 2000-2001, "high velocity" features are seen that are red-shifted up to 225 km s(-1)...
Henkel, C., Braatz, J. A., Greenhill, L. J., Wilson, A. S.
Water vapor emission at 22 GHz is reported from the nucleus of the LINER galaxy Mrk 1419 (NGC 2960). Single-dish spectra of the maser source show properties that are similar to those seen in NGC...
Ground-based terahertz CO spectroscopy towards orion (2002)
Kawamura, J., Hunter, T. R., Tong, C. Y. E., Blundell, R., Papa, D. C., Patt, F., ...
Using a superconductive hot-electron bolometer heterodyne receiver on the 10-m Heinrich Hertz Telescope on Mount Graham, Arizona, we have obtained velocity-resolved 1.037 THz CO (J = 9 --> 8) spectra...
Molecular gas and star formation in Lynds 870 (2002)
Mao, R. Q., Yang, J., Henkel, C., Jiang, Z. B.
We present molecular line and submillimeter dust continuum observations of the Lynds 870 cloud in the vicinity of IRAS 20231+3440. Two submillimeter cores, SMM1 and SMM2, are identified mapping the...
Tarchi, A., Henkel, C., Peck, A. B., Menten, K. M.
We report the detection of 22 GHz water vapor emission toward the starburst galaxy NGC 2146, made using the Effelsberg 100-m telescope. Interferometric observations with the Very Large Array (VLA)...
Water maser emission in IC 342 (2002)
Tarchi, A., Henkel, C., Peck, A. B., Menten, K. M.
The detection of 22 GHz water vapor emission from IC 342 is reported, raising the detection rate among northern galaxies with IRAS point source fluxes S-100mum > 50 Jy to 16%. The maser, associated...
Taylor, G. B., Peck, A. B., Henkel, C., Falcke, H., Mundell, C. G., O'Dea, C. P., ...
We report on the discovery of H I in absorption toward the gigamaser galaxy TXS 2226-184 using the Very Large Array. The absorption appears to consist of two components one with a width of 125 km...
Towards proper motions in the local group (2002)
Brunthaler, A., Reid, M., Falcke, H., Greenhill, L., Henkel, C.
A flaring megamaser in Mrk 348 (2002)
Peck, A. B., Falcke, H., Henkel, C., Menten, K. M., Hagiwara, Y., Gallimore, J. F., ...
Proceedings of the 6th European VLBI Network Symposium (2002)
Ros Porcas Lobanov, A. Brunthaler, M. Reid, H. Falcke, L. J. Greenhill, C. Henkel
Key and still largely missing parameters for measuring the mass content and distribution of the Local Group are the proper motion vectors of its member galaxies. The problem when trying to derive the...
Towards Proper Motions in the Local Group (2002)
Porcas R. W, J. A. (eds, A. Brunthaler, M. Reid, H. Falcke, L.J. Greenhill, ...
Key and still largely missing parameters for measuring the mass content and distribution of the Local Group are the proper motion vectors of its member galaxies. The problem when trying to derive the...
High resolution imaging of molecular line emission from high redshift QSOs (2001)
Carilli, C. L., Kohno, K., Kawabe, R., Ohta, K., Henkel, C., Menten, K., ...
We present moderate (1'') and high resolution (0.2'') observations of the CO(2-1) emission at 43 GHz, and radio continuum emission at 1.47 GHz, from the z=4.7 QSO BRI 1202-0725 and the z=4.4 QSO BRI...
Atomic and Molecular Gas in the Starburst Galaxy NGC4945 (2001)
Ott, M., Whiteoak, J. B., Henkel, C., Wielebinski, R.
Spatial and kinematical correlations between HI and CO (2-1) emission of the southern spiral galaxy NGC4945 are studied with a common angular (23 arcsec) and velocity resolution (7 km/s). The 21cm...
Submillimeter CO Line Emission from Orion (2001)
Wilson, T. L., Muders, D., Kramer, C., Henkel, C.
Images of an 8 square minute region around the Orion KL source have been made in the J=7-6 (806 GHz) and J=4-3 (461 GHz) lines of CO with angular resolutions of 13" and 18". These data were taken...
VLBA Observations and Effelsberg Monitoring of a Flaring Water Maser in Mrk 348 (2001)
Peck, A. B., Falcke, H., Henkel, C., Menten, K. M.
We report on single-dish monitoring as well as extremely high angular resolution observations of the flaring H2O maser in the Seyfert 2 galaxy Mrk 348. The H2O line is redshifted by ~130 km/s with...
First detection of ammonia in M82 (2001)
Weiss, A., Neininger, N., Henkel, C., Stutzki, J., Klein, U.
We report the detection of the (J,K) = (1,1), (2,2), and (3,3) inversion lines of ammonia (NH3) towards the south--western molecular lobe in M82. The relative intensities of the ammonia lines are...
Molecular gas and dust in NGC4550: A galaxy with two counterrotating stellar disks (2001)
We report the detection of 1 10^7 M_sun of molecular gas in the central region of the S0/E7 galaxy NGC4550, inferred from observations of CO(1-0) emission. Dust is detected in HST WFPC2 images and...
A Flaring Megamaser in Mrk 348 (2001)
Peck, A. B., Falcke, H., Henkel, C., Menten, K. M., Hagiwara, Y., Gallimore, J. F., ...
We report new observations of the H2O megamaser in the Seyfert 2 galaxy Mrk 348. Following our initial detection in 2000 March using the Effelsberg 100 m telescope, re-analysis of previous data on...
Shocked ammonia in the WR nebula NGC 2359 (2001)
Rizzo, J. R., Martin-Pintado, J., Henkel, C.
We report the detection of the (1,1) and (2,2) metastable lines of ammonia (NH_3) in the molecular cloud associated with the Wolf--Rayet (WR) nebula NGC 2359. Besides the CO and H_2, this is the...
Gallimore, J. F., Henkel, C., Baum, S. A., Glass, I. S., Claussen, M. J., Prieto, M. A., ...
We report new (1995) Very Large Array observations and (1984 - 1999) Effelsberg 100m monitoring observations of the 22 GHz H2O maser spectrum of the Seyfert 2 galaxy NGC 1068. The sensitive VLA...
VLBA Observations and Effelsberg Monitoring of a Flaring Water Maser in Mrk 348 (2001)
A. B. Peck, H. Falcke, C. Henkel, K. M. Menten
We report on single-dish monitoring as well as extremely high angular resolution observations of the aring H 2 O maser in the Seyfert 2 galaxy Mrk 348. The H 2 O line is redshifted by 130 km s with...
We discuss the transport of matter waves in low-dimensional waveguides. Due to scattering from uncontrollable noise fields, the spatial coherence gets reduced and eventually lost. We develop a...
Dense Gas in Nearby Galaxies: XIV. Detection of hot ammonia in Maffei 2 (2000)
Henkel, C., Mauersberger, R., Peck, A. B., Falcke, H., Hagiwara, Y.
The (J,K) = (1,1), (2,2), (3,3), and (4,4) inversion lines of ammonia (NH3) have been detected toward the nuclear 40'' sized bar of the nearby spiral galaxy Maffei 2. The relative intensities of the...
Spatial coherence of thermal near fields (2000)
Henkel, C., Joulain, K., Carminati, R.
We analyze the spatial coherence of the electromagnetic field emitted by a half-space at temperature T close to the interface. An asymptotic analysis allows to identify three different contributions...
Coherent transport of matter waves (2000)
A transport theory for atomic matter waves in low-dimensional waveguides is outlined. The thermal fluctuation spectrum of magnetic near fields leaking out of metallic microstructures is estimated....
HNCO in massive galactic dense cores (2000)
Zinchenko, I., Henkel, C., Mao, R. Q.
We surveyed 81 dense molecular cores associated with regions of massive star formation and Sgr A in the 5_{05}-4_{04} and 10_{010}-9_{09} lines of HNCO. Line emission was detected towards 57 objects....
Mao, R. Q., Henkel, C., Schulz, A., Zielinsky, M., Mauersberger, R., Stoerzer, H., ...
12CO 1-0,2-1,4-3,7-6, and 13CO 1-0, 2-1, and 3-2 line was mapped with angular resolutions of 13" - 22" toward the nuclear region of starburst galaxy M82. The difference of lobe spacings in...
Heating of trapped particles close to surfaces - Blackbody and beyond (2000)
We discuss heating and decoherence in traps for ions and neutral particles close to metallic surfaces. We focus on simple trap geometries and compute noise spectra of thermally excited...
Accelerations of Water Masers in NGC4258 (2000)
Bragg, A. E., Greenhill, L. J., Moran, J. M., Henkel, C.
The water masers in NGC4258 delineate the structure and dynamics of a sub-parsec-diameter accretion disk around a supermassive black hole. We report acceleration measurements for 12 systemic-velocity...
Dense gas in nearby galaxies - XIV. Detection of hot ammonia in Maffei 2 (2000)
C. Henkel, R. Mauersberger, A.B. Peck, Falcke H, Hagiwara Y
. The (J; K) = (1,1), (2,2), (3,3), and (4,4) inversion lines of ammonia (NH 3 ) have been detected toward the nuclear 40 00 sized bar of the nearby spiral galaxy Maffei 2. The relative intensities...
A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk (1999)
Herrnstein, J. R., Moran, J. M., Greenhill, L. J., Diamond, P. J., Inoue, M., Nakai, N., ...
The water maser in the mildly active nucleus in the nearby galaxy NGC4258 traces a thin, nearly edge-on, subparsec-scale Keplerian disk. Using the technique of very long baseline interferometry, we...
X-ray Emission from the Prototypical LINER Galaxy NGC 1052 (1999)
Weaver, K. A., Wilson, A. S., Henkel, C., Braatz, J. A.
We examine the 0.1 to 10.0 keV X-ray spectrum of the bright nuclear LINER galaxy NGC 1052, one of two elliptical galaxies known to contain a luminous H2O maser. The observed 2.0-10.0 keV spectrum is...
The Ionization Fraction in the Obscuring `Torus' of an Active Galactic Nucleus (1998)
Wilson, A. S., Roy, A. L., Ulvestad, J. S., Colbert, E. J. M., Weaver, K. A., Braatz, J. A., ...
In this paper, we report VLBA radio maps at three frequencies and an ASCA X-ray spectrum of the water megamaser galaxy NGC 2639, which is believed to contain an edge-on viewed accretion disk. The...
H_2O megamaser emission from FR I radio galaxies (1998)
Henkel, C., Wang, Y. P., Falcke, H., Wilson, A. S., Braatz, J. A.
A systematic search for 22 GHz H2O megamaser emission is reported for 50 nearby (z < 0.15) FR I galaxies. No detection was obtained, implying that ultraluminous H2O masers (L_H2O>10^3 L_sun) must be...
Molecular gas in the Galactic center region III. Probing shocks in molecular cores (1998)
Huettemeister, S., Dahmen, G., Mauersberger, R., Henkel, C., Wilson, T. L., Martin-Pintado, J.
Multiline observations of C18O and SiO isotopomers toward 33 molecular peaks in the Galactic center region, taken at the SEST, JCMT and HHT telescopes, are presented. The C18O presumably traces the...
Molecular abundances in the Magellanic Clouds III. LIRS 36, a star-forming region in the SMC (1997)
Henkel, C., Millar, T. J., Whiteoak, J. B., Marx-Zimmer, M.
Detections of CO, CS, SO, C2H, HCO+, HCN, HNC, H2CO, and C3H2 reported from LIRS 36, a star-forming region in the Small Magellanic Cloud. C18O, NO, CH3OH, and most notably CN have not been detected,...
Henkel, C., Mauersberger, R., Whiteoak, J. B.
$^{12}$C$/^{13}$C line intensity ratios have been derived from several carbon-bearing molecules to confine the range of carbon and oxygen isotope abundance ratios toward the nuclear regions of two...
Braatz, J. A., Wilson, A. S., Henkel, C.
A survey for H2O megamaser emission from 354 active galaxies has resulted in the detection of 10 new sources, making 16 known altogether. The galaxies surveyed include a distance-limited sample...
Codella, C., Welser, R., Henkel, C., Benson, P. J., Myers, P. C.
Trying to obtain a more complete picture of star forming regions in the Taurus Molecular Cloud, four newly discovered dense cores (L1521D, L1521F, L1524, L1507A) are identified and mapped through the...
Huettemeister, S., Mauersberger, R., Henkel, C.
Multilevel observations of formaldehyde (H_2CO) and methanol (CH_3OH) toward the nearby spiral galaxies NGC 253, Maffei 2, IC 342, M 82 and NGC 6946 are presented. H_2CO was detected in all galaxies...
Interstellar $^{36}$S: a probe of s-process nucleosynthesis (1996)
Mauersberger, R., Henkel, C., Langer, N.
The first detection of a $^{36}$S-bearing molecule in interstellar space is reported. The $J$=$2-1$ and $3-2$ transitions of C$^{36}$S have been observed toward eight Galactic molecular hot cores....
Molecular abundances in the Magellanic Clouds II. Deuterated species in the LMC (1996)
Henkel, C., Millar, T. J., Whiteoak, J. B., Mauersberger, R.
The first definite discoveries of extragalactic deuterium are reported. DCO$^+$ has been detected in three and DCN has been measured in one star-forming region of the Large Magellanic Cloud (LMC)....
Molecular abundances in the Magellanic Clouds I. A multiline study of five cloud cores (1996)
Henkel, C., Whiteoak, J. B., Millar, T. J., Hunt, M. R., Lemme, C.
Nine HII regions of the LMC were mapped in 13CO(1--0) and three in 12CO(1--0) to study the physical properties of the interstellar medium in the Magellanic Clouds. For N113 the molecular core is...
Interstellar sulfur isotopes and stellar oxygen burning (1995)
Henkel, C., Whiteoak, J. B., Langer, N., Churchwell, E. B.
A 12C32S, 13C32S, 12C34S, and 12C33S J = 2 - 1 line survey has been made to study interstellar 32S/34S and 34S/33S ratios from the galactic disk. The four CS isotopomers were detected in 20 star...
A modulated mirror for atomic interferometry (1994)
Henkel, C., Steane, A., Kaiser, R., Dalibard, J.
A novel atomic beam splitter, using reflection of atoms off an evanescent light wave, is investigated theoretically. The intensity or frequency of the light is modulated in order to create sidebands...
Atomic diffraction by a thin phase grating (1994)
We present a semiclassical perturbation method for the description of atomic diffraction by a weakly modulated potential. It proceeds in a way similar to the treatment of light diffraction by a thin...
A modulated mirror for atomic interferometry (1994)
Henkel, C., Steane, A., Kaiser, R., Dalibard, J.
A novel atomic beam splitter, using reflection of atoms off an evanescent light wave, is investigated theoretically. The intensity or frequency of the light is modulated in order to create sidebands...
Atomic diffraction by a thin phase grating (1994)
We present a semiclassical perturbation method for the description of atomic diffraction by a weakly modulated potential. It proceeds in a way similar to the treatment of light diffraction by a thin...
A modulated mirror for atomic interferometry (1994)
Henkel, C., Steane, A., Kaiser, R., Dalibard, J.
A novel atomic beam splitter, using reflection of atoms off an evanescent light wave, is investigated theoretically. The intensity or frequency of the light is modulated in order to create sidebands...
Atomic diffraction by a thin phase grating (1994)
We present a semiclassical perturbation method for the description of atomic diffraction by a weakly modulated potential. It proceeds in a way similar to the treatment of light diffraction by a thin...