A Search for H2O Megamasers in High-z Type-2 AGNs (2009)
Bennert, Nicola, Barvainis, Richard, Henkel, Christian, Antonucci, Robert
We report a search for H2O megamasers in 274 SDSS type-2 AGNs (0.3 < z < 0.83), half of which can be classified as type-2 QSOs from their [OIII] 5007 luminosity, using the Robert C. Byrd Green Bank...
Lo, Nadia, Cunningham, Maria R., Jones, Paul A., Bains, I., Burton, M. G., Wong, T., ...
We present multimolecular line maps obtained with the Mopra telescope towards the southern giant molecular cloud (GMC) complex G333, associated with the H II region RCW 106. We have characterized the...
Henkel, Christian, Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, Victor V., Braatz, James 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...
Lo, Nadia, Cunningham, Maria R., Jones, Paul A., Bains, I., Burton, M. G., Wong, T., ...
We present multimolecular line maps obtained with the Mopra telescope towards the southern giant molecular cloud (GMC) complex G333, associated with the H II region RCW 106. We have characterized the...
Henkel, Christian, Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, Victor V., Braatz, James 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...
Properties of the molecular gas in a starbursting QSO at z=1.83 in the COSMOS field (2008)
Aravena, Manuel, Bertoldi, Frank, Schinnerer, Eva, Weiss, Axel, Jahnke, Knud, Carilli, Chris L., ...
Using the IRAM 30m telescope, we have detected the CO 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...
Murphy, Michael T., Flambaum, Victor V., Muller, Sebastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
The Molecular Ridge Close to 30 Doradus in the Large Magellanic Cloud (2008)
Ott, Juergen, Wong, Tony, Pineda, Jorge L., Hughes, Annie, Muller, Erik, Li, Zhi-Yun, ...
With the ATNF Mopra telescope we are performing a survey in the 12CO(1-0) line to map the molecular gas in the Large Magellanic Cloud (LMC). For some regions we also obtained interferometric maps of...
Murphy, Michael T., Flambaum, Victor V., Muller, Sébastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
Murphy, Michael T., Flambaum, Victor V., Muller, Sébastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
The molecular ridge close to 30 Doradus in the Large Magellanic Cloud (2008)
Ott, Jurgen, Wong, Tony, Pineda, Jorge L., Hughes, Annie, Muller, Erik, Li, Zhi-Yun, ...
With the ATNF Mopra telescope we are performing a survey in the 12CO(1-0) line to map the molecular gas in the Large Magellanic Cloud. For some regions we also obtained interferometric maps of the...
The molecular ridge close to 30 Doradus in the Large Magellanic Cloud (2008)
Ott, Jürgen, Wong, Tony, Pineda, Jorge L., Hughes, Annie, Muller, Erik, Li, Zhi-Yun, ...
With the ATNF Mopra telescope we are performing a survey in the ^(12)CO(1–0) line to map the molecular gas in the Large Magellanic Cloud. For some regions we also obtained interferometric maps of...
Murphy, Michael T., Flambaum, Victor V., Muller, Sebastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
Murphy, Michael T., Flambaum, Victor V., Muller, Sebastien, Henkel, Christian
The Standard Model of particle physics assumes that the so-called fundamental constants are universal and unchanging. Absorption lines arising in molecular clouds along quasar sightlines offer a...
The molecular ridge close to 30 Doradus in the Large Magellanic Cloud (2008)
Ott, Jurgen, Wong, Tony, Pineda, Jorge L., Hughes, Annie, Muller, Erik, Li, Zhi-Yun, ...
With the ATNF Mopra telescope we are performing a survey in the 12CO(1-0) line to map the molecular gas in the Large Magellanic Cloud. For some regions we also obtained interferometric maps of the...
HST and VLA Observations of the H2O Gigamaser Galaxy TXS2226-184 (2007)
Heino Falcke, Andrew S. Wilson, Christian Henkel, Andreas Brunthaler, James A. Braatz
We present HST/WFPC2 images in Hff+[N II]6548,6583 lines and continuum radiation and a VLA map at 8 GHz of the H 2 O gigamaser galaxy TXS2226-184. This galaxy has the most luminous H 2 O maser...
M Telescope, Yoshiaki Hagiwara, Christian Henkel, William A. Sherwood
Abstract. We present single-dish monitoring of the 22 GHz water maser lines from the Seyfert 2 galaxies NGC 3079, M51(NGC 5194), NGC 5793, and the radio galaxy NGC 315 with the Effelsberg 100-m radio...
Signatures of inflow motion in cores of massive star formation: Potential collapse candidates (2007)
Wu, Yuefang, Henkel, Christian, Xue, Rui, Guan, Xin, Miller, Martin
Using the IRAM 30 m telescope, a mapping survey in optically thick and thin lines was performed towards 46 high mass star-forming regions. The sample includes UC H{\sc ii} precursors and UC H{\sc ii}...
Formaldehyde Densitometry of Starburst Galaxies (2007)
Mangum, Jeffrey G., Darling, Jeremy, Menten, Karl M., Henkel, Christian
With a goal toward deriving the physical conditions in external galaxies, we present a survey of the formaldehyde emission in a sample of starburst systems. By extending a technique used to derive...
Molecular tori in AGN: a search using excited states of OH (2006)
Impellizzeri, C. M. Violette, Roy, Alan L., Henkel, Christian
One of the fundamental concepts in the unified scheme of AGN is that both Seyfert 1 and Seyfert 2 galaxies harbour supermassive nuclear engines blocked from direct view by an optically and...
CO(1-0) in z >/~ 4 Quasar Host Galaxies: No Evidence for Extended Molecular Gas Reservoirs (2006)
Riechers, Dominik A., Walter, Fabian, Carilli, Christopher L., Knudsen, Kirsten K., Lo, K. Y., Benford, Dominic J., ...
We present CO(1-0) observations of the high-redshift quasi-stellar objects (QSOs) BR 1202-0725 (z=4.69), PSS J2322+1944 (z=4.12), and APM 08279+5255 (z=3.91) using the NRAO Green Bank Telescope (GBT)...
CO(1-0) in z >~ 4 quasar fost galaxies: No evidence for extended molecular gas reservoirs (2006)
Riechers, Dominik A., Walter, Fabian, Carilli, Christopher L., Knudsen, Kirsten K., Lo, K. Y., Benford, Dominic J., ...
We present 12CO(J=1-->0) observations of the high-redshift quasi-stellar objects (QSOs) BR 1202-0725 (z=4.69), PSS J2322+1944 (z=4.12), and APM 08279+5255 (z=3.91) using the NRAO Green Bank Telescope...
The Temperature Distribution of Dense Molecular Gas in the Center of NGC 253 (2005)
Ott, Juergen, Weiss, Axel, Henkel, Christian, Walter, Fabian
[abridged] We present interferometric maps of ammonia (NH3) of the nearby starburst galaxy NGC 253 [star formation rate: ~2.8 Mo yr^(-1)]. The observations have been taken with the Australia...
The temperature distribution of dense molecular gas in the center of NGC 253 (2005)
Ott, Jürgen, Weiss, Axel, Henkel, Christian, Walter, Fabian
We present interferometric maps of ammonia (NH3) of the nearby starburst galaxy NGC 253. The observations have been taken with the Australia Telescope Compact Array and include the para-NH3 (1, 1)...
The Temperature Distribution of Dense Molecular Gas in Starburst Cores (2005)
Ott, Jürgen, Weiß, Axel, Henkel, Christian, Walter, Fabian
We present interferometric maps of ammonia within the cores of a sample of eight prominent, southern starburst galaxies. The observations were performed with the Australia Telescope Compact Array. In...
Bennert, Nicola, Schulz, Hartmut, Henkel, Christian
Long-slit optical emission-line spectra of the H2O megamaser galaxies ESO 103-G03, TXS 2226-184, and IC 1481 are evaluated in order to look for characteristics typical for water-megamaser galaxies....
Taylor, Gregory, Peck, Alison, Henkel, Christian, Falcke, Heino, Mundell, Carole, O'Dea, Christopher, ...
Also archived in: arXiv: astro-ph/0203415 v1 22 Mar 2002
Taylor, Gregory, Peck, Alison, Henkel, Christian, Falcke, Heino, Mundell, Carole, O'Dea, Christopher, ...
Also archived in: arXiv: astro-ph/0203415 v1 22 Mar 2002
Water Maser Emission from the Active Nucleus in M51 (2001)
Hagiwara, Yoshiaki, Henkel, Christian, Menten, Karl. M., Nakai, Naomasa
22 GHz water vapor `kilomaser' emission is reported from the central region of the Whirlpool galaxy M 51 (NGC 5194). The red-shifted spectral features (Vlsr ~ 560 km/s), flaring during most of the...
Gallimore, Jack, Henkel, Christian, Baum, Stefi, Glass, Ian, Claussen, Mark, Prieto, M. Almudena, ...
Also archived in: arXiv: astro-ph/0104083 v1 4 Apr 2001
Gallimore, Jack, Henkel, Christian, Baum, Stefi, Glass, Ian, Claussen, Mark, Prieto, M. Almudena, ...
Also archived in: arXiv: astro-ph/0104083 v1 4 Apr 2001
Host galaxies and nuclear structure of AGN with H_2O megamasers as seen with HST (2001)
Falcke, Heino, Henkel, Christian, Wilson, Andrew S., Braatz, James A.
We present results of an HST survey in Halpha and continuum filters of a sample of H_2O megamaser galaxies compiled by Braatz et al., all of which contain AGN. These observations allow us to study...
Host Galaxies and Nuclear Structure of AGN with H2O Megamasers as Seen with HST (2001)
Heino Falcke, Christian Henkel, Andrew S. Wilson, James A. Braatz
We present results of an HST survey in H and continuum lters of a sample of H2O megamaser galaxies compiled by Braatz et al., all of which contain AGN. These observations allow us to study the...
Discovery of a very luminous megamaser during a radio flare in the Seyfert 2 galaxy Mrk 348 (2000)
Falcke, Heino, Henkel, Christian, Peck, Alison B., Hagiwara, Yoshiaki, Prieto, M. Almudena, Gallimore, Jack F.
We report the detection of a new H_2O megamaser in the Seyfert 2 galaxy Mrk 348 with the MPIfR 100 m telescope in Effelsberg. With an apparent isotropic luminosity of L_H2O ~ 420 L_sun the maser is...
Discovery of a very luminous megamaser during a radio are in the Seyfert 2 galaxy Mrk 348 (2000)
Heino Falcke, Christian Henkel, Alison B. Peck, Yoshiaki Hagiwara, M. Almudena Prieto, F. Gallimore
. We report the detection of a new H 2 O megamaser in the Seyfert 2 galaxy Mrk 348 with the MPIfR 100 m telescope in Eelsberg. With an apparent isotropic luminosity of LH2O ' 420L the maser is...
HST and VLA Observations of the H2O Gigamaser Galaxy TXS2226-184 (1999)
Falcke, Heino, Wilson, Andrew S., Henkel, Christian, Brunthaler, Andreas, Braatz, James A.
We present HST/WFPC2 images in Halpha+[NII]6548,6583 lines and continuum radiation and a VLA map at 8 GHz of the H2O gigamaser galaxy TXS2226-184. This galaxy has the most luminous H2O maser emission...
Chin, Yi-nan, Henkel, Christian, Langer, Norbert, Mauersberger, Rainer
Detections of extragalactic $^{15}$N are reported from observations of the rare hydrogen cyanide isotope HC$^{15}$N toward the Large Magellanic Cloud (LMC) and the core of the (post-) starburst...
Molecular gas in the elliptical galaxy NGC759. Interferometric CO observations (1997)
Wiklind, Tommy, Combes, Francoise, Henkel, Christian, Wyrowski, Friedrich
Interferometric observations of the CO(1-0) line in the elliptical galaxy NGC759 shows that it contains 2 10^9 Mo of molecular gas, confined to a circumnuclear ring with an average radius of only...
München, Univ., Diss., 1984.