Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars

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dc.creatorRichards, Gordon T.
dc.creatorLacy, Mark
dc.creatorStorrie-Lombardi, Lisa J.
dc.creatorHall, Patrick B.
dc.creatorGallagher, S. C.
dc.creatorHines, Dean C.
dc.creatorFan, Xiaohui
dc.creatorPapovich, Casey
dc.creatorBerk, Daniel E. Vanden
dc.creatorTrammell, George B.
dc.creatorSchneider, Donald P.
dc.creatorVestergaard, Marianne
dc.creatorYork, Donald G.
dc.creatorJester, Sebastian
dc.creatorAnderson, Scott F.
dc.creatorBudavari, Tamas
dc.creatorSzalay, Alexander S.
dc.date2006-01-24
dc.date2006-06-26
dc.date.accessioned2026-07-07T12:16:26Z
dc.date.available2026-07-07T12:16:26Z
dc.descriptionWe 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 (AGN) 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 a factor of 2 for individual quasars. 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.
dc.description52 pages, 24 figures (12 color), 3 tables, ApJS accepted; higher resolution accepted version available at ftp://ftp.astro.princeton.edu/gtr/flsqsos/May2506/
dc.identifierhttps://arxiv.org/abs/astro-ph/0601558
dc.identifierhttp://arxiv.org/abs/astro-ph/0601558
dc.identifierAstrophys.J.Suppl.166:470-497,2006
dc.identifierdoi:10.1086/506525
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211802
dc.subjectAstrophysics
dc.titleSpectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
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