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Title:
Active Galactic Nucleus and Starburst Classification from Spitzer Mid-Infrared Spectra for High-Redshift SWIRE Sources
Authors:
Weedman, D.; Polletta, M.; Lonsdale, C. J.; Wilkes, B. J.; Siana, B.; Houck, J. R.; Surace, J.; Shupe, D.; Farrah, D.; Smith, H. E.
Affiliation:
AA(Astronomy Department, Cornell University, Ithaca, NY 14853; .), AB(Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093.), AC(Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093.), AD(Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AE(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125.), AF(Astronomy Department, Cornell University, Ithaca, NY 14853; .), AG(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125.), AH(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125.), AI(Astronomy Department, Cornell University, Ithaca, NY 14853; .), AJ(Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093.)
Publication:
The Astrophysical Journal, Volume 653, Issue 1, pp. 101-111. (ApJ Homepage)
Publication Date:
12/2006
Origin:
UCP
ApJ Keywords:
ISM: Dust, Extinction, Galaxies: Active, Galaxies: High-Redshift, Galaxies: Starburst, Infrared: Galaxies, X-Rays: Galaxies
DOI:
10.1086/508647
Bibliographic Code:
2006ApJ...653..101W

Abstract

Spectra have been obtained with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope for 20 sources in the Lockman Hole field of the SWIRE survey. The sample is divided between sources with indicators of an obscured AGN, based primarily on X-ray detections of optically faint sources, and sources with indicators of a starburst, based on optical and near-infrared spectral energy distributions (SEDs), which show a luminosity peak from stellar photospheric emission. Ten of the 11 AGN sources have IRS spectra that show silicate absorption or are power laws; only one AGN source shows PAH emission features. All nine of the sources showing starburst SEDs in the near-infrared show PAH emission features in the IRS spectra. Redshifts are determined from the IRS spectra for all nine starbursts (1.0<z<1.9) and 8 of the 11 AGNs (0.6<z<2.5). Classification as AGN because of an X-ray detection, the classification as AGN or starburst derived from the photometric SED, and the IRS spectroscopic classification as AGN (silicate absorption) or starburst (PAH emission) are all consistent in 18 of 20 sources. The surface density for starbursts that are most luminous in the mid-infrared is less than that for the most luminous AGNs within the redshift interval 1.7<~z<~1.9. This result implies that mid-infrared source counts at high redshift are dominated by AGNs for fν(24 μm)>~1.0 mJy.
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