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Full-Text Articles in Physical Sciences and Mathematics
Pah Emission From Ultraluminous Infrared Galaxies, V. Desai, L. Armus, H. W. W. Spoon, Vassilis Charmandaris, J. Bernard-Salas, B. R. Brandl, D. Farrah, B.T. Soifer, H. I. Teplitz, P. M. Ogle, D. Devost, Sarah J.U. Higdon, J. A. Marshall, J. R. Houck
Pah Emission From Ultraluminous Infrared Galaxies, V. Desai, L. Armus, H. W. W. Spoon, Vassilis Charmandaris, J. Bernard-Salas, B. R. Brandl, D. Farrah, B.T. Soifer, H. I. Teplitz, P. M. Ogle, D. Devost, Sarah J.U. Higdon, J. A. Marshall, J. R. Houck
Department of Physics and Astronomy Faculty Publications
We explore the relationships between the Polycyclic Aromatic Hydrocarbon (PAH) feature strengths, mid-infrared continuum luminosities, far-infrared spectral slopes, optical spectroscopic classifications, and silicate optical depths within a sample of 107 ULIRGs observed with the Infrared Spectrograph on the Spitzer Space Telescope. The detected 6.2 µm PAH equivalent widths (EQWs) in the sample span more than two orders of magnitude (∼0.006–0.8 µm), and ULIRGs with HII-like optical spectra or steep far-infrared spectral slopes (S25/S60 < 0.2) typically have 6.2 µm PAH EQWs that are half that of lower-luminosity starbursts. A significant fraction (∼40–60%) of HII-like, LINER-like, and cold ULIRGs have very weak PAH EQWs. Many of these ULIRGs also have large (τ9.7 > 2.3) silicate optical depths. The far-infrared spectral slope is strongly correlated with PAH EQW, but not with silicate optical depth. In addition, the PAH EQW decreases with …
Hubble Space Telescope Morphologies Of Z ~ 2 Dust Obscured Galaxies. I. Power-Law Sources, R.S. Bussman, Arjun Dey, J. Lotz, Lee Armus, Kate Brand, Michael J. I. Brown, Vandana Desai, Peter Eisenhardt, James L. Higdon, Sarah J.U. Higdon, B. T. Jannuzi, Emeric Le Floc'h, J. Melbourne, B. T. Soifer, Daniel Weedman
Hubble Space Telescope Morphologies Of Z ~ 2 Dust Obscured Galaxies. I. Power-Law Sources, R.S. Bussman, Arjun Dey, J. Lotz, Lee Armus, Kate Brand, Michael J. I. Brown, Vandana Desai, Peter Eisenhardt, James L. Higdon, Sarah J.U. Higdon, B. T. Jannuzi, Emeric Le Floc'h, J. Melbourne, B. T. Soifer, Daniel Weedman
Department of Physics and Astronomy Faculty Publications
We present high spatial resolution optical and near-infrared imaging obtained using the ACS, WFPC2 and NICMOS cameras aboard the Hubble Space Telescope of 31 24µm–bright z ≈ 2 Dust Obscured Galaxies (DOGs) identified in the Bo¨otes Field of the NOAO Deep Wide-Field Survey. Although this subset of DOGs have mid-IR spectral energy distributions dominated by a power-law component suggestive of an AGN, all but one of the galaxies are spatially extended and not dominated by an unresolved component at rest-frame UV or optical wavelengths. The observed V − H and I − H colors of the extended components are 0.2−3 …