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Spitzer Observations Of Tidal Dwarf Galaxies, Sarah J.U. Higdon, James L. Higdon
Spitzer Observations Of Tidal Dwarf Galaxies, Sarah J.U. Higdon, James L. Higdon
Department of Physics and Astronomy Faculty Publications
We present Spitzer observations of Tidal Dwarf Galaxies (TDGs) in three interacting systems: NGC 5291, Arp 105 & Stephan’s Quintet. The spectra show bright emission from polyaromatic hydrocarbons (PAHs), nebular lines and warm molecular hydrogen, characteristic of recent episodes of star formation. The PAH emission that falls in the IRAC 8.0 µm band leads to the TDGs having an extremely red IRAC color, with [4.5] − [8.0] > 3. The emission from PAHs is characterized by a model with mainly neutral 100-C PAH atoms.
A Significant Population Of Very Luminous Dust-Obscured Galaxies At Redshift Z ~ 2, Arjun Dey, B.T. Soifer, Vandana Desai, Kate Brand, Emeric Le Floc'h, Michael J. I. Brown, Buell T. Jannuzi, Lee Armus, R. Shane Bussmann, Mark Brodwin, Chao Bian, Peter Eisenhardt, Sarah J.U. Higdon, Daniel Weedman, S. P. Willner
A Significant Population Of Very Luminous Dust-Obscured Galaxies At Redshift Z ~ 2, Arjun Dey, B.T. Soifer, Vandana Desai, Kate Brand, Emeric Le Floc'h, Michael J. I. Brown, Buell T. Jannuzi, Lee Armus, R. Shane Bussmann, Mark Brodwin, Chao Bian, Peter Eisenhardt, Sarah J.U. Higdon, Daniel Weedman, S. P. Willner
Department of Physics and Astronomy Faculty Publications
Observations with the Spitzer Space Telescope have recently revealed a significant population of high-redshift (z ∼ 2) dust-obscured galaxies (DOGs) with large (rest-frame) mid-infrared to ultraviolet luminosity ratios. Due to their optical faintness, these galaxies have been previously missed in traditional optical studies of the distant universe. We present a simple method for selecting this high-redshift population based solely on the ratio of the observed mid-infrared 24µm to optical R-band flux density. We apply this method to observations of the ≈ 8.6 deg2 Bo¨otes Field of the NOAO Deep Wide-Field Survey, and uncover ≈2,600 DOG candidates (i.e., a surface density …