Detections of water ice, hydrocarbons, and 3.3um PAH in z~2 ULIRGs (2009)
Sajina, A., Spoon, H., Yan, L., Imanishi, M., Fadda, D., Elitzur, M.
We present the first detections of the 3um water ice and 3.4um amorphous hydrocarbon (HAC) absorption features in z~2 ULIRGs. These are based on deep rest-frame 2-8um Spitzer IRS spectra of 11...
A differentially rotating disc in a high-mass protostellar system (2009)
Pestalozzi, M., Elitzur, M., Conway, J.
A strong signature of a circumstellar disc around a high-mass protostar has been inferred from high resolution methanol maser observations in NGC7538-IRS1 N. This interpretation has however been...
Unveiling the nature of Seyfert nuclei with 1 - 100 micron spectral energy distributions (2008)
Buchanan, C. L., Gallimore, J. F., O'Dea, C. P., Baum, S. A., Axon, D. J., Robinson, A., ...
The infrared is a key wavelength regime for probing the dusty, obscured nuclear regions of active galaxies. We present results from an infrared study of 87 nearby Seyfert galaxies using the Spitzer...
Silicates in ultraluminous infrared galaxies (2008)
Sirocky, M. M., Levenson, N. A., Elitzur, M., Spoon, H. W. W., Armus, L.
We analyze the mid-infrared (MIR) spectra of ultraluminous infrared galaxies (ULIRGs) observed with the Spitzer Space Telescope's Infrared Spectrograph. Dust emission dominates the MIR spectra of...
Silicates in Ultra-Luminous Infrared Galaxies (2008)
Sirocky, M. M., Levenson, N. A., Elitzur, M., Spoon, H. W. W., Armus, L.
We analyze the mid-infrared (MIR) spectra of ultraluminous infrared galaxies (ULIRGs) observed with the Spitzer Space Telescope's Infrared Spectrograph. Dust emission dominates the MIR spectra of...
Gemini Mid-IR Polarimetry of NGC 1068 (2008)
C. Packham, E. Perlman, J. H. Hough, J. Radomski, K. Volk, M. Elitzur, ...
Deo, R. P., Crenshaw, D. M., Kraemer, S. B., Dietrich, M., Elitzur, M., Teplitz, H., ...
We present Spitzer mid-infrared spectra of 12 Seyfert 1.8 and 1.9 galaxies over the 5-38 μm region. We compare the spectral characteristics of this sample to those of 58 Seyfert 1 and 2 galaxies...
Stellar Outflows Driven By Radiation Pressure (2007)
Ivezi Knapp, G. R. Knapp, M. Elitzur
We present a detailed, self-consistent model of radiatively driven stellar outflows which couples the radiative transfer and hydrodynamics equations. The circumstellar envelope, which consists of gas...
Deo, R. P., Crenshaw, D. M., Kraemer, S. B., Dietrich, M., Elitzur, M., Teplitz, H., ...
We present Spitzer Space Telescope mid-infrared spectra of 12 Seyfert 1.8 and 1.9 galaxies over the 5-38 um region. We compare the spectral characteristics of this sample to those of 58 Seyfert 1 and...
Gemini Mid-IR Polarimetry of NGC1068: Polarized Structures Around the Nucleus (2007)
Packham, C., Young, S., Fisher, R. S., Volk, K., Mason, R., Hough, J. H., ...
We present diffraction limited, 10um imaging polarimetry data for the central regions of the archetypal Seyfert AGN, NGC1068. The position angle of polarization is consistent with three dominant...
The Mid-Infrared Emission of M87 (2007)
Perlman, E. S., Mason, R. E., Packham, Christopher, Levenson, N. A., Elitzur, M., Schaefer, Justin J., ...
We discuss Subaru and Spitzer Space Telescope imaging and spectroscopy of M87 in the mid-infrared from 5-35 um. These observations allow us to investigate mid-IR emission mechanisms in the core of...
Gallagher, S. C., Richards, G. T., Lacy, M., Hines, D. C., Elitzur, M., Storrie-Lombardi, L. J.
We present an analysis of the effects of luminosity on the shape of the mid-infrared spectral energy distributions (SEDs) of 234 radio-quiet quasars originally presented by Richards et al. In quasars...
Dust and PAH emission in the star-forming active nucleus of NGC 1097 (2007)
Mason, R. E., Levenson, N. A., Packham, C., Elitzur, M., Radomski, J., Petric, A. O., ...
The nucleus of the nearby galaxy, NGC 1097, is known to host a young, compact (r < 9 parsec) nuclear star cluster as well as a low-luminosity active galactic nucleus (AGN). It has been suggested both...
Gemini mid-IR polarimetry of NGC1068: polarized structures around the nucleus. (2007)
Packham, C., Young, S., Fisher, R.S., Volk, K., Mason, R., Hough, J., ...
Original article can be found at: http://www.iop.org/EJ/journal/apjl Copyright American Astronomical Society DOI: 10.1086/518602 [Full text of this article is not available in the UHRA]
Measuring the inhomogeneous obscuration of AGN with mid-infrared observations (2007)
M. Elitzur, M. M. Sirocky, M. Nenkova, N. A. Levenson, R. E. Mason, T. R. Geballe
We apply inhomogeneous models of the ob- scuring torus of AGNs, emphasizing the mid- IR observational consequences.
The distribution of silicate strength in Spitzer spectra of AGNs and ULIRGs (2006)
Hao, Lei, Weedman, D. W., Spoon, H. W. W., Marshall, J. A., Levenson, N. A., Elitzur, M., ...
A sample of 196 AGNs and ULIRGs observed by the Infrared Spectrograph (IRS) on Spitzer is analyzed to study the distribution of the strength of the 9.7 micron silicate feature. Average spectra are...
Mid-IR Galaxy Classification Based on Silicate Obscuration and PAH Equivalent Width (2006)
Spoon, H. W. W., Marshall, J. A., Houck, J. R., Elitzur, M., Hao, L., Armus, L., ...
We present a new diagnostic diagram for mid-infrared spectra of infrared galaxies based on the equivalent width of the 6.2 micron PAH emission feature and the strength of the 9.7 micron silicate...
Levenson, N. A., Sirocky, M. M., Hao, L., Spoon, H. W. W., Marshall, J. A., Elitzur, M., ...
The silicate cross section peak near 10um produces emission and absorption features in the spectra of dusty galactic nuclei observed with the Spitzer Space Telescope. Especially in ultraluminous...
Spatially-resolved mid-ir spectroscopy of ngc 1068 (2006)
C. Packham, N. A. Levenson, R. E. Mason, R. S. Fisher, T. R. Geballe, M. Elitzur, ...
Spatially-resolved mid-ir spectroscopy of ngc 1068
Detection of a far-infrared bow shock nebula around R Hya: The first MIRIAD results (2006)
Ueta, T., Speck, A. K., Stencel, R. E., Herwig, F., Gehrz, R. D., Szczerba, R., ...
We present the first results of the MIRIAD (MIPS InfraRed Imaging of AGB Dust shells) project using the Spitzer Space Telescope. The primary aim of the project is to probe the material distribution...
Detached shells as tracers of AGB-ISM bow shocks (2006)
Wareing, C. J., Zijlstra, Albert A., Speck, Angela K., O'Brien, T. J., Ueta, Toshiya, Elitzur, M., ...
New Spitzer imaging observations have revealed the structure around the Mira variable star R Hya to be a one-sided parabolic arc 100 arcsec to the West stretching from North to South. We successfully...
Detection of a Far-Infrared Bow-Shock Nebula Around R Hya: the First MIRIAD Results (2006)
Ueta, T., Speck, A. K., Stencel, R. E., Herwig, F., Gehrz, R. D., Szczerba, R., ...
We present the first results of the MIRIAD (MIPS [Multiband Imaging Photometer for Spitzer] Infra-Red Imaging of AGB [asymptotic giant branch] Dustshells) project using the Spitzer Space Telescope....
Kraus, S., Balega, Y., Elitzur, M., Preibisch, Th., Rosen, A., ...
NGC 7538 IRS1 is a high-mass (approx. 30 M_sun) protostar with a CO outflow, an associated UCHII region, and a linear methanol maser structure, which might trace a Keplerian-rotating circumstellar...
Spatially-resolved mid-ir spectroscopy of ngc 1068 (2006)
Elitzur, M., Fisher, R. S., Geballe, T. R., Levenson, N. A., Mason, R. E., Packham, C., ...
Mason, R. E., Geballe, T. R., Packham, C., Levenson, N. A., Elitzur, M., Fisher, R. S., ...
We present spatially-resolved, near-diffraction-limited 10 micron spectra of the nucleus of the Seyfert 2 galaxy NGC 1068, obtained with Michelle, the mid-IR imager and spectrometer on the 8.1 m...
A compact starburst ring traced by clumpy OH megamaser emission (2005)
Parra, R., Conway, J. E., Elitzur, M., Pihlström, Y. M.
We model the OH megamaser emission from the luminous infrared galaxy IIIZw35 as arising from a narrow rotating starburst ring of radius 22 pc enclosing a mass of 7 x 10^6 Msun. We show how both the...
Justtanont, K., Bergman, P., Larsson, B., Olofsson, H., Schoier, F. L., Frisk, U., ...
We present Odin observations of the AGB star W Hya in the ground-state transition of ortho-H2O, 1(10)-1(01), at 557GHz. The line is clearly of circumstellar origin. Radiative transfer modelling of...
Modelling a Circumstellar Disc Traced by Methanol Masers. (2005)
Pestalozzi, M., Elitzur, M., Minier, V., Conway, J., Booth, R., De Buizer, J., ...
NG7538 IRS1 N: modeling a circumstellar maser disk (2004)
Pestalozzi, M. R., Elitzur, M., Conway, J., Booth, R.
We present an edge-on Keplerian disk model to explain the main component of the 12.2 and 6.7 GHz methanol maser emission detected toward NGC7538-IRS1 N. The brightness distribution and spectrum of...
A thin ring model for the OH megamaser in IIIZw35 (2004)
Parra, R., Conway, J. E., Elitzur, M.
We present a model for the OH megamaser emission in the starburst galaxy IIIZw35. The observed diffuse and compact OH maser components in this source are explained by a single phase of unsaturated...
Spectral line and continuum radiation propagation in a clumpy medium (2004)
Conway, J. E., Elitzur, M., Parra, R.
We discuss the propagation of spectral line and continuum radiation in a clumpy medium and give general expressions for the observed absorption or emission from a cloud population. We show that the...
Bipolar outflow on the Asymptotic Giant Branch - the case of IRC+10011 (2004)
Vinkovic, D., Bloecker, Th., Elitzur, M., Weigelt, G.
Near-IR imaging of the AGB star IRC+10011 (= CIT3) reveals the presence of a bipolar structure within the central ~0.1 arcsec of a spherical dusty wind. We show that the image asymmetries originate...
Bipolar outflow on the asymptotic giant branch - the case of IRC+10011 (2004)
Vinkovic, D., Blöcker, T., Hofmann, K. H., Elitzur, M., Weigelt, G.
The Most Detailed Picture Yet of an Embedded High-mass YSO (2003)
Greenhill, L. J., Reid, M. J., Chandler, C. J., Diamond, P. J., Elitzur, M.
High-mass star formation is not well understood chiefly because examples are deeply embedded, relatively distant, and crowded with sources of emission. Using VLA and VLBA observations of water and...
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...
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...
Dust Emission from Active Galactic Nuclei (2002)
Nenkova, M., Ivezic, Z., Elitzur, M.
Unified schemes of active galactic nuclei (AGN) require an obscuring dusty torus around the central source, giving rise to Seyfert 1 line spectrum for pole-on viewing and Seyfert 2 characteristics in...
Dust Emission from Herbig Ae/Be stars - Evidence for Disks and Envelopes (1999)
Miroshnichenko, A., Ivezic, Z., Vinkovic, D., Elitzur, M.
IR and mm-wave emission from Herbig Ae/Be stars has produced conflicting conclusions regarding the dust geometry in these objects. We show that the compact dimensions of the mm-wave emitting regions...
Stellar Outflows Driven by Radiation Pressure (1998)
Ivezic, Z., Knapp, G. R., Elitzur, M.
We present a detailed, self-consistent model of radiatively driven stellar outflows which couples the radiative transfer and hydrodynamics equations. The circumstellar envelope, which consists of gas...