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HUDF-JD 2 : Mid-infrared Evidence for a z ∼ 2 Luminous Infrared
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chary, R. V. Teplitz, Harry I. Dickinson, Mark E. Koo, David C. Floc’h, Emeric Le Marcillac, Delphine Papovich, Casey M. Stern, Daniel |
| Copyright Year | 2008 |
| Abstract | The Hubble Ultra Deep Field source JD2 presented in Mobasher et al. (2005) is an unusual galaxy that is very faint at all wavelengths shortward of 1.1μm. Photometric redshift fits to data at 0.4 to 8 μm yield a significant probability that it is an extremely massive galaxy at z ∼ 6.5. In this paper we present new photometry at 16μm and 22μm from Spitzer Infrared Spectrograph (IRS) peakup imaging of the Great Observatories Origins Deep Survey (GOODS) fields. We find that the spectral energy distribution shows a factor of ∼4 rise in flux density between the 16μm and 22μm bandpass which is most likely due to the entrance of polycyclic aromatic hydrocarbon emission features into the 22μm and 24μm passbands. The flux ratio between these bandpasses can be best fit by a z ∼ 1.7 luminous infrared galaxy with a bolometric luminosity of (2−6)×10 L⊙ corresponding to a star-formation rate of 80 M⊙ yr . The predicted flux density values at other longer wavelengths are below the detection limits of current instrumentation but such sources could potentially be detected in lensed submillimeter surveys. Re-evaluation of the optical/near-infrared photometry continues to favor z > 6 photometric redshift solutions, but we argue that the consistency of the multiwavelength parameters of this galaxy with other dusty starbursts favor the z ∼ 2 mid-infrared photometric redshift. The data presented here provide Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125; rchary@caltech.edu NOAO, 950 N. Cherry St., Tucson, AZ 85719 UCO/Lick Observatories, Santa Cruz, CA 95064 Institute for Astronomy, Honolulu, HI 96822 Steward Observatory, University of Arizona, Tucson, AZ 85721 Jet Propulsion Laboratory, Pasadena, CA 91109 Spitzer Fellow |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/0705.0660v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | A* search algorithm AROMATICS Active galactic nucleus Assignment Zero Atrioventricular Block Classification Command & Conquer:Yuri's Revenge Curve fitting Doctor of Law Dropout (neural networks) Eighty FITS Flux GUCY2C protein, human Galaxy Hewlett-Packard 95LX Hydrocarbons Infrared Science Archive Instrumentation (attribute) JD - Java Decompiler Luminous Studio MAG (cryptography) Marginal model National origin Photometry Polycyclic Hydrocarbons, Aromatic Redshift Solutions Spectroscopy, Near-Infrared United States National Aeronautics and Space Administration Universal Disk Format wavelength |
| Content Type | Text |
| Resource Type | Article |
