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Spectral energy distributions of quasars selected in the mid-infrared

Published online by Cambridge University Press:  17 August 2012

M. Lacy ,
A. Sajina ,
A. O. Petric ,
S. E. Ridgway ,
D. M. Nielsen ,
T. Urrutia ,
D. Farrah  and
E. L. Gates
M. Lacy
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA22903, USA email: [email protected]
A. Sajina
Affiliation:
Dept. of Physics and Astronomy, Tufts University, Medford, MA02155
A. O. Petric
Affiliation:
Department of Astronomy, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA91125, USA
S. E. Ridgway
Affiliation:
National Optical Astronomy Observatory, 950 N. Cherry Avenue, Tucson, AZ85719, USA
D. M. Nielsen
Affiliation:
Dept. of Astronomy, University of Wisconsin, Madison, WI53706
T. Urrutia
Affiliation:
Liebnitz Institut für Astrophysik Astrophysics Potsdam, An der Sternwarte 16, 14482, Potsdam, Germany
D. Farrah
Affiliation:
Department of Physics and Astronomy, University of Sussex, Falmer, Brighton BN1 9QH, UK
E. L. Gates
Affiliation:
UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA95064
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Abstract

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We present preliminary results on fitting of SEDs to 142 z < 1 quasars selected in the mid-infrared. Our quasar selection finds objects ranging in extinction from highly obscured, type-2 quasars, through more lightly reddened type-1 quasars and normal type-1s. We find a weak tendency for the objects with the highest far-infrared emission to be obscured quasars, but no bulk systematic offset between the far-infrared properties of dusty and normal quasars as might be expected in the most naive evolutionary schemes. The hosts of the type-2 quasars have stellar masses comparable to those of radio galaxies at similar redshifts. Many of the type-1s, and possibly a one of the type-2s require a very hot dust component in addition to the normal torus emission.

Keywords

galaxies:activequasars: generalinfrared: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 224 - 227
Copyright
Copyright © International Astronomical Union 2012

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