Far-infrared Properties of Type 1 Quasars

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

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Abstract

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.

Additional Information

© 2013 American Astronomical Society. Received 2012 October 5; accepted 2013 March 2; published 2013 April 9. Support for this work was provided by NASA through contract NASA-ADAP NNX10AD52G. This publication makes use of (1) raw data from the Spitzer Space Telescope, operated by the Jet Propulsion Laboratory/California Institute of Technology under NASA contract, (2) data products from the Two Micron All Sky Survey, a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and the NSF, and (3) the SDSS, managed by the Astrophysical Research Consortium for the Participating Institutions and funded by the Alfred P. Sloan Foundation, the Participating Institutions, and many others.

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