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Title:
Millimeter Observations of Obscured Spitzer 24 μm Sources
Authors:
Lutz, D.; Yan, L.; Armus, L.; Helou, G.; Tacconi, L. J.; Genzel, R.; Baker, A. J.
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , .), AB(Spitzer Science Center, California Institute of Technology, 1200 East California Boulevard, MC 220-6, Pasadena, CA 91125; , , .), AC(Spitzer Science Center, California Institute of Technology, 1200 East California Boulevard, MC 220-6, Pasadena, CA 91125; , , .), AD(Spitzer Science Center, California Institute of Technology, 1200 East California Boulevard, MC 220-6, Pasadena, CA 91125; , , .), AE(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , .), AF(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , .), AG(Jansky Fellow, National Radio Astronomy Observatory.; Department of Astronomy, University of Maryland, College Park, MD 20742-2421 .)
Publication:
The Astrophysical Journal, Volume 632, Issue 1, pp. L13-L16. (ApJL Homepage)
Publication Date:
10/2005
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Galaxies: Starburst, Infrared: Galaxies
DOI:
10.1086/497639
Bibliographic Code:
2005ApJ...632L..13L

Abstract

We present MAMBO 1.2 mm observations of 40 extragalactic sources from the Spitzer First Look Survey that are bright in the mid-IR (S24μm>1 mJy) but optically obscured (log[νFν(24 μm)/νFν(0.7 μm)]>1). We use these observations to search for cold dust emission, probing the similarity of their spectral energy distributions to star-forming IR galaxies or obscured AGNs. The sample as a whole is well detected at mean S1.2mm=0.74+/-0.09 mJy and S1.2mm/S24μm=0.15+/-0.03. Seven (three) of the sources are individually detected at >3 σ (>5 σ) levels. Mean millimeter fluxes are higher for sources with the reddest mid-IR/optical colors. Optically faint but with relatively low millimeter-to-mid-IR ratios, the typical SEDs are inconsistent with redshifted SED shapes of local star-forming IR galaxies. They also differ from SEDs of typical submillimeter-selected galaxies, with the 24 μm sources that are individually detected by MAMBO possibly representing intermediate objects. Compared to star-forming galaxies, a stronger but optically obscured mid-IR component without associated strong far-IR emission has to be included. This component may be due to luminous optically obscured AGN, which would represent a significant part of the high-redshift AGN population.
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