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Published December 2011 | Published
Journal Article Open

The Stellar, Molecular Gas, and Dust Content of the Host Galaxies of Two z ~ 2.8 Dust-Obscured Quasars

Abstract

We present optical through radio observations of the host galaxies of two dust-obscured, luminous quasars selected in the mid-infrared, at z = 2.62 and z = 2.99, including a search for CO emission. Our limits on the CO luminosities are consistent with these objects having masses of molecular gas ≾ 10^(10) M_☉, several times less than those of luminous submillimeter-detected galaxies at comparable redshifts. Their near-infrared spectral energy distributions, however, imply that these galaxies have high stellar masses (~10^(11)-10^(12) M_☉). The relatively small reservoirs of molecular gas and low dust masses are consistent with them being relatively mature systems at high-z.

Additional Information

© 2011 The American Astronomical Society. Received 2011 February 15; accepted 2011 October 5; published 2011 November 11. We thank Chris Carilli for helpful advice on EVLA observations, Hana Schumacher for providing a more accurate estimate of the CO (1–0) luminosity for one of the high-redshift radiointermediate type-2 quasars, and the referee for comments that significantly improved the manuscript. The National Radio Astronomy Observatory is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc. Observations reported here were obtained at the MMT Observatory, a joint facility of the Smithsonian Institution and the University of Arizona. MMT time was granted by NOAO through the Telescope System Instrumentation Program (TSIP). TSIP is funded by NSF. M.L. and A.P. were visiting astronomers at the Infrared Telescope Facility, which is operated by the University of Hawaii under Cooperative Agreement no. NNX-08AE38A with National Aeronautics and Space Administration, Science Mission Directorate, Planetary Astronomy Program. The NASA/IPAC Extragalactic Database (NED) and Infrared Science Archive (IRSA) are operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia with significant participation from NASA.

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