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Journal article
Spectral energy distributions and multiwavelength selection of type 1 quasars
The Astrophysical journal. Supplement series, v 166(2), pp 470-497
01 Oct 2006
Abstract
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 similar to 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 SEDcan 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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Details
- Title
- Spectral energy distributions and multiwavelength selection of type 1 quasars
- Creators
- Gordon T. Richards - Johns Hopkins UniversityMark Lacy - California Institute of TechnologyLisa J. Storrie-Lombardi - California Institute of TechnologyPatrick B. Hall - York UniversityS. C. Gallagher - University of California, Los AngelesDean C. Hines - Space Science InstituteXiaohui Fan - Steward Health Care SystemCasey Papovich - Steward Health Care SystemDaniel E. Vanden Berk - Pennsylvania State UniversityGeorge B. Trammell - Pennsylvania State UniversityDonald P. Schneider - Pennsylvania State UniversityMarianne Vestergaard - Steward Health Care SystemDonald G. York - University of ChicagoSebastian Jester - FermilabScott F. Anderson - University of WashingtonTamas Budavari - Johns Hopkins UniversityAlexander S. Szalay - Johns Hopkins University
- Publication Details
- The Astrophysical journal. Supplement series, v 166(2), pp 470-497
- Publisher
- Iop Publishing Ltd
- Number of pages
- 28
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000241193300002
- Scopus ID
- 2-s2.0-33751584733
- Other Identifier
- 991019201704004721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics