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Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars

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Richards, Gordon T., Lacy, Mark, Storrie‐Lombardi, Lisa J., Hall, Patrick B., Gallagher, S. C., Hines, Dean C., Fan, Xiaohui, Papovich, Casey, Vanden Berk, Daniel E., Trammell, George B., Schneider, Donald P., Vestergaard, Marianne, York, Donald G., Jester, Sebastian, Anderson, Scott F., Budavari, Tamas, Szalay, Alexander S.·2006·The Astrophysical Journal Supplement Series

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 ~ 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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Metadata

Authors
Richards, G. T., Lacy, M., Storrie‐Lombardi, L. J., Hall, P. B., Gallagher, S. C., Hines, D. C., Fan, X., Papovich, C., Vanden Berk, D. E., Trammell, G. B., Schneider, D. P., Vestergaard, M., York, D. G., Jester, S., Anderson, S. F., Budavari, T., & Szalay, A. S.
Venue
The Astrophysical Journal Supplement Series
Published
2006-10
Volume
166
Issue
2
Pages
470-497
ISSN
  • 0067-0049 (ISSN-L)
  • 1538-4365
OpenAlex
W2119836155
Cited by
1,220
References
4
FWCI
22.75
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars. https://app.cochat.ai/papers/10.1086/506525
The paper
Richards, G. T., Lacy, M., Storrie‐Lombardi, L. J., Hall, P. B., Gallagher, S. C., Hines, D. C., Fan, X., Papovich, C., Vanden Berk, D. E., Trammell, G. B., Schneider, D. P., Vestergaard, M., York, D. G., Jester, S., Anderson, S. F., Budavari, T., & Szalay, A. S. (2006). Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars. The Astrophysical Journal Supplement Series. https://doi.org/10.1086/506525

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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