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Title:
Spitzer IRS Spectra of Optically Faint Infrared Sources with Weak Spectral Features
Authors:
Weedman, D. W.; Soifer, B. T.; Hao, Lei; Higdon, J. L.; Higdon, S. J. U.; Houck, J. R.; Le Floc'h, E.; Brown, M. J. I.; Dey, A.; Jannuzi, B. T.; Rieke, M.; Desai, V.; Bian, C.; Thompson, D.; Armus, L.; Teplitz, H.; Eisenhardt, P.; Willner, S. P.
Affiliation:
AA(Astronomy Department, Cornell University, Ithaca, NY 14853; .), AB(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125.; Division of Physics, Mathematics and Astronomy, 320-47, California Institute of Technology, Pasadena, CA 91125.), AC(Astronomy Department, Cornell University, Ithaca, NY 14853; .), AD(Astronomy Department, Cornell University, Ithaca, NY 14853; .), AE(Astronomy Department, Cornell University, Ithaca, NY 14853; .), AF(Astronomy Department, Cornell University, Ithaca, NY 14853; .), AG(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AH(Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544-1001.; National Optical Astronomy Observatory, Tucson, AZ 85726.), AI(National Optical Astronomy Observatory, Tucson, AZ 85726.), AJ(National Optical Astronomy Observatory, Tucson, AZ 85726.), AK(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AL(Division of Physics, Mathematics and Astronomy, 320-47, California Institute of Technology, Pasadena, CA 91125.), AM(Division of Physics, Mathematics and Astronomy, 320-47, California Institute of Technology, Pasadena, CA 91125.), AN(Division of Physics, Mathematics and Astronomy, 320-47, California Institute of Technology, Pasadena, CA 91125.), AO(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125.), AP(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125.), AQ(Jet Propulsion Laboratory, 4800 Oak Grove Drive, 169-327, Pasadena, CA 91109.), AR(Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138.)
Publication:
The Astrophysical Journal, Volume 651, Issue 1, pp. 101-112. (ApJ Homepage)
Publication Date:
11/2006
Origin:
UCP
ApJ Keywords:
ISM: Dust, Extinction, Galaxies: Active, Galaxies: High-Redshift, Galaxies: Starburst, Infrared: Galaxies
DOI:
10.1086/507322
Bibliographic Code:
2006ApJ...651..101W

Abstract

Spectra have been obtained with the low-resolution modules of the Infrared Spectrograph (IRS) on the Spitzer Space Telescope (Spitzer) for 58 sources having fν(24 μm)>0.75 mJy. Sources were chosen from a survey of 8.2 deg2 within the NOAO Deep Wide-Field Survey region in Boötes (NDWFS) using the Multiband Imaging Photometer (MIPS) on Spitzer. Most sources are optically very faint (I>24 mag). Redshifts have previously been determined for 34 sources, based primarily on the presence of a deep 9.7 μm silicate absorption feature, with a median z of 2.2. Spectra are presented for the remaining 24 sources for which we were previously unable to determine a confident redshift because the IRS spectra show no strong features. Optical photometry from the NDWFS and infrared photometry with MIPS and the Infrared Array Camera on Spitzer (IRAC) are given, with K photometry from the Keck I telescope for some objects. The sources without strong spectral features have overall spectral energy distributions (SEDs) and distributions among optical and infrared fluxes that are similar to those for the sources with strong absorption features. Nine of the 24 sources are found to have feasible redshift determinations based on fits of a weak silicate absorption feature. Results confirm that the ``1 mJy'' population of 24 μm Spitzer sources that are optically faint is dominated by dusty sources with spectroscopic indicators of an obscured AGN rather than a starburst. There remain 14 of the 58 sources observed in Boötes for which no redshift could be estimated, and 5 of these sources are invisible at all optical wavelengths.
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