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An Accounting of the Dust-obscured Star Formation and Accretion Histories Over the Last ~11 Billion Years

Murphy, E. J. and Chary, R.-R. and Dickinson, M. and Pope, A. and Frayer, D. T. and Lin, L. (2011) An Accounting of the Dust-obscured Star Formation and Accretion Histories Over the Last ~11 Billion Years. Astrophysical Journal, 732 (2). Art. No. 126. ISSN 0004-637X.

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We report on an accounting of the star-formation- and accretion-driven energetics of 24 μm-detected sources in the Great Observatories Origins Deep Survey-North field. For sources having infrared (IR; 8-1000 μm) luminosities ≳3 × 10^(12) L_☉ when derived by fitting local spectral energy distributions (SEDs) to 24 μm photometry alone, we find these IR luminosity estimates to be a factor of ~4 times larger than those estimated when the SED fitting includes additional 16 and 70 μm data (and in some cases mid-IR spectroscopy and 850 μm data). This discrepancy arises from the fact that high-luminosity sources at z ≫ 0 appear to have far- to mid-IR ratios, as well as aromatic feature equivalent widths, typical of lower luminosity galaxies in the local universe. Using our improved estimates for IR luminosity and active galactic nucleus (AGN) contributions, we investigate the evolution of the IR luminosity density versus redshift arising from star formation and AGN processes alone. We find that, within the uncertainties, the total star-formation-driven IR luminosity density is constant between 1.15 ≲ z ≲ 2.35, although our results suggest a slightly larger value at z ≳ 2. AGNs appear to account for ≲18% of the total IR luminosity density integrated between 0 ≲ z ≲ 2.35, contributing ≲25% at each epoch. Luminous infrared galaxies (LIRGs; 10^(11) L_☉ ≤ L_(IR) < 10^(12) L_☉) appear to dominate the star formation rate density along with normal star-forming galaxies (L_(IR) < 10^(11) L_☉) between 0.6 ≲ z ≲ 1.15. Once beyond z gsim 2, the contribution from ultraluminous infrared galaxies (L IR ≥ 10^(12) L_☉) becomes comparable with that of LIRGs. Using our improved IR luminosity estimates, we find existing calibrations for UV extinction corrections based on measurements of the UV spectral slope typically overcorrect UV luminosities by a factor of ~2, on average, for our sample of 24 μm-selected sources; accordingly we have derived a new UV extinction correction more appropriate for our sample.

Item Type:Article
Related URLs:
URLURL TypeDescription
Murphy, E. J.0000-0001-7089-7325
Chary, R.-R.0000-0001-7583-0621
Dickinson, M.0000-0001-5414-5131
Pope, A.0000-0001-8592-2706
Frayer, D. T.0000-0003-1924-1122
Lin, L.0000-0001-7218-7407
Additional Information:© 2011 American Astronomical Society. Received 2010 September 13; accepted 2011 February 18; published 2011 April 26. We thank members of the GOODS team who contributed to the data reduction and photometric catalogs for the various data sets used here, particularly Norman Grogin, Yicheng Guo, Joshua Lee, Kyoungsoo Lee, and Harry Ferguson. We also thank G. Morrison for useful discussions. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. Partly based on observations obtained with WIRCam, a joint project of Canada–France–Hawaii Telescope (CFHT), Taiwan, Korea, Canada, France, at the CFHT which is operated by the National Research Council (NRC) of Canada, the Institute National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:galaxies: evolution; infrared: galaxies; radio continuum: galaxies; ultraviolet: galaxies
Issue or Number:2
Classification Code:PACS: 97.10.Bt; 98.54.Ep; 98.54.Cm; 98.62.Qz; 95.85.Hp
Record Number:CaltechAUTHORS:20110517-152142490
Persistent URL:
Official Citation:An Accounting of the Dust-obscured Star Formation and Accretion Histories Over the Last ~11 Billion Years E. J. Murphy et al. 2011 ApJ 732 126
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23699
Deposited By: Jason Perez
Deposited On:18 May 2011 18:40
Last Modified:09 Mar 2020 13:19

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