Far-infrared Properties of Type 1 Quasars

May 2013 • 2013ApJ...768...13H

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

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.


IPAC Authors


Lee Armus

Senior Scientist

James Colbert

Associate Scientist

Vandana Desai

Senior Scientist


Roberta Paladini

Senior Research Scientist


Harry Teplitz

Senior Scientist