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Spitzer Observations of Young Red Quasars

Urrutia, Tanya and Lacy, Mark and Spoon, Henrik and Glikman, Eilat and Petric, Andreea and Schulz, Bernhard (2012) Spitzer Observations of Young Red Quasars. Astrophysical Journal, 757 (2). Art. No. 125. ISSN 0004-637X.

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We present mid-infrared spectra and photometry of 13 redshift 0.4 < z < 1 dust reddened quasars obtained with Spitzer IRS and MIPS. We compare properties derived from their infrared spectral energy distributions (intrinsic active galactic nucleus (AGN) luminosity and far-infrared luminosity from star formation) to the host luminosities and morphologies from Hubble Space Telescope imaging, and black hole masses estimated from optical and/or near-infrared spectroscopy. Our results are broadly consistent with models in which most dust reddened quasars are an intermediate phase between a merger-driven starburst triggering a completely obscured AGN, and a normal, unreddened quasar. We find that many of our objects have high accretion rates, close to the Eddington limit. These objects tend to fall below the black hole mass-bulge luminosity relation as defined by local galaxies, whereas most of our low accretion rate objects are slightly above the local relation, as typical for normal quasars at these redshifts. Our observations are therefore most readily interpreted in a scenario in which galaxy stellar mass growth occurs first by about a factor of three in each merger/starburst event, followed sometime later by black hole growth by a similar amount. We do not, however, see any direct evidence for quasar feedback affecting star formation in our objects, for example, in the form of a relationship between accretion rate and star formation. Five of our objects, however, do show evidence for outflows in the [O III]5007 Å emission line profile, suggesting that the quasar activity is driving thermal winds in at least some members of our sample.

Item Type:Article
Related URLs:
URLURL TypeDescription
Urrutia, Tanya0000-0001-6746-9936
Lacy, Mark0000-0002-3032-1783
Spoon, Henrik0000-0002-8712-369X
Glikman, Eilat0000-0003-0489-3750
Petric, Andreea0000-0003-4030-3455
Additional Information:© 2012 American Astronomical Society. Received 2012 February 10; accepted 2012 July 17; published 2012 September 11. We thank the Spitzer Science Center for funding through Spitzer program 40143. 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. This publication makes use of data products from the Widefield Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS Web site is This work was partly performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under contract No. DE-AC52-07NA27344. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Spitzer Science Center40143
Department of Energy (DOE)DE-AC52-07NA27344
Subject Keywords:infrared: galaxies; galaxies: evolution; galaxies: starburst; quasars: general
Issue or Number:2
Record Number:CaltechAUTHORS:20121107-110209631
Persistent URL:
Official Citation:Spitzer Observations of Young Red Quasars Tanya Urrutia et al. 2012 ApJ 757 125
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35329
Deposited By: Jason Perez
Deposited On:07 Nov 2012 22:42
Last Modified:04 Nov 2019 02:05

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