Maqola

Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars

Gordon T. RichardsDepartment of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686M. LacySpitzer Science Center, California Institute of Technology, Mail Code 220-6, Pasadena, CA 91125Lisa J. Storrie‐LombardiSpitzer Science Center, California Institute of Technology, Mail Code 220-6, Pasadena, CA 91125Patrick B. HallDepartment of Physics and Astronomy, York University, 4700 Keele Street, Toronto, ON M3J 1P3, CanadaS. C. GallagherDean C. HinesSpace Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301Xiaohui FanSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721Casey PapovichSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721D. E. vanden BerkDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802George B. TrammellDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802Donald P. SchneiderDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802M. VestergaardSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721Donald G. YorkDepartment of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637Sebastian JesterFermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510Scott F. AndersonDepartment of Astronomy, University of Washington, Box 351580, Seattle, WA 98195Tamás BudaváriDepartment of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686Alexander S. SzalayDepartment of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686

2006en

ABI

Annotatsiya

We present an analysis of the mid-infrared (MIR) and optical properties of type 1 (broad-line) quasars detected by the Spitzer Space Telescope. The MIR color-redshift relation is characterized to z $ 3, with predictions to z 7. We demonstrate how combining MIR and optical colors can yield even more efficient selection of active galactic nuclei (AGNs) than MIR or optical colors alone. Composite spectral energy distributions (SEDs) are constructed for 259 quasars with both Sloan Digital Sky Survey and Spitzer photometry, supplemented by near-IR, GALEX, VLA, and ROSAT data, where available. We discuss how the spectral diversity of quasars influences the determination of bolometric luminosities and accretion rates; assuming the mean SED can lead to errors as large as 50% for individual quasars when inferring a bolometric luminosity from an optical luminosity. Finally, we show that careful consideration of the shape of the mean quasar SED and its redshift dependence leads to a lower estimate of the fraction of reddened /obscured AGNs missed by optical surveys as compared to estimates derived from a single mean MIR to optical flux ratio.

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Identifikatorlar

DOI: 10.1086/506525

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