Spitzer 70/160 μm observations of high-redshift ULIRGs and HyLIRSs in the Boötes field

Creators: Tyler, Krystal D.; Le Floc'h, Emeric; Rieke, George H.; Dey, Arjun; Desai, Vandana; Brand, Kate; Borys, Colin; Jannuzi, Buell T.; Armus, Lee; Dole, Hervé; Papovich, Casey; Brown, Michael J. I.; Blaylock, Myra; Higdon, Sarah J. U.; Higdon, James L.; Charmandaris, Vassilis; Ashby, Matthew L. N.; Smith, Howard A.

Abstract

We present new 70 and 160 μm observations of a sample of extremely red (R – [24] ≳ 15 mag), mid-infrared bright, high-redshift (1.7 ≾ z ≾ 2.8) galaxies. All targets detected in the far-infrared exhibit rising spectral energy distributions (SEDs) consistent with dust emission from obscured active galactic nuclei (AGNs) and/or star-forming regions in luminous IR galaxies (LIRGs). We find that the SEDs of the high-redshift sources are more similar to canonical AGN-dominated local ultraluminous IR galaxies (ULIRGs) with significant warm dust components than to typical local star-forming ULIRGs. The inferred IR (8-1000 μm) bolometric luminosities are found to be Lbol ~ 4 × 10^12 L⊙ to ~3 × 10^13 L⊙ (ULIRGs/hyper-luminous IR galaxies (HyLIRGs)), representing the first robust constraints on Lbol for this class of object.

Additional Information

© 2009 The American Astronomical Society. Received 2007 September 4; accepted 2008 September 19; published 2009 February 12. We thank all of our MIPS, IRS, and Bootes collaborators for their discussion and input, as well as Jason Marshall for supplying us with the NGC7714 template and the referee for useful comments and suggestions. This work is based on observations made with the Spitzer Space Telescope, which is operated by NASA/JPL/Caltech. We thank NASA for financial support through contracts 1255094 and 1276199. E.L.F. and C.P. acknowledge support by NASA through the Spitzer Space Telescope Fellowship Program. The research activities of A.D. and B.T.J. are supported by NOAO, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. V.C. acknowledges partial support from the EU ToK grant 39965.

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