Far-infrared properties of type 1 quasars

D. J. Hanish, H. I. Teplitz, P. Capak, V. Desai, L. Armus, C. Brinkworth, T. Brooke, J. Colbert, D. Fadda, D. Frayer, M. Huynh, M. Lacy, E. Murphy, A. Noriega-Crespo, R. Paladini, C. Scarlata, S. Shenoy

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4 Scopus citations


We use the Spitzer Space Telescope Enhanced Imaging Products and the Spitzer Archival Far-InfraRed Extragalactic Survey to study the spectral energy distributions (SEDs) of spectroscopically confirmed type 1 quasars selected from the Sloan Digital Sky Survey (SDSS). By combining the Spitzer and SDSS data with the Two Micron All Sky Survey, we are able to construct a statistically robust rest-frame 0.1-100 μm type 1 quasar template. We find that the quasar population is well-described by a single power-law SED at wavelengths less than 20 μm, in good agreement with previous work. However, at longer wavelengths, we find a significant excess in infrared luminosity above an extrapolated power-law, along with significant object-to-object dispersion in the SED. The mean excess reaches a maximum of 0.8 dex at rest-frame wavelengths near 100 μm.

Original languageEnglish (US)
Article number13
JournalAstrophysical Journal
Issue number1
StatePublished - May 1 2013


  • galaxies: active
  • infrared: galaxies
  • quasars: general
  • surveys


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