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The Optical, Infrared and Radio Properties of Extragalactic Sources Observed by SDSS, 2MASS and FIRST Surveys

Published online by Cambridge University Press:  12 April 2016

Ž. Ivezić ,
R.H. Becker ,
M. Blanton ,
X. Fan ,
K. Finlator ,
J.E. Gunn ,
P. Hall ,
R.S.J. Kim ,
G.R. Knapp  and
J. Loveday
...Show all authors
Ž. Ivezić
Affiliation:
Princeton University
R.H. Becker
Affiliation:
University of California
M. Blanton
Affiliation:
The New York University
X. Fan
Affiliation:
Princeton University
K. Finlator
Affiliation:
Princeton University
J.E. Gunn
Affiliation:
Princeton University
P. Hall
Affiliation:
Princeton University
R.S.J. Kim
Affiliation:
The John Hopkins University
G.R. Knapp
Affiliation:
Princeton University
J. Loveday
Affiliation:
University of Sussex
R.H. Lupton
Affiliation:
Princeton University
K. Menou
Affiliation:
Princeton University
V. Narayanan
Affiliation:
Princeton University
G.R. Richards
Affiliation:
Pennsylvania State University
C.M. Rockosi
Affiliation:
University of Washington
D. Schlegel
Affiliation:
Princeton University
D.P. Schneider
Affiliation:
Pennsylvania State University
I. Strateva
Affiliation:
Princeton University
M.A. Strauss
Affiliation:
Princeton University
D.Vanden Berk
Affiliation:
Fermi National Accelerator Laboratory
W. Voges
Affiliation:
Max-Planck-Institute für Extraterrestrische Physik
B. Yanny
Affiliation:
Fermi National Accelerator Laboratory

Abstract

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We positionally match sources observed by the Sloan Digital Sky Survey (SDSS), the Two Micron All Sky Survey (2MASS), and the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey. Practically all 2MASS sources are matched to an SDSS source within 2 arcsec; ~11% of them are optically resolved galaxies and the rest are dominated by stars. About 1/3 of FIRST sources are matched to an SDSS source within 2 arcsec; ~80% of these are galaxies and the rest are dominated by quasars. Based on these results, we project that by the completion of these surveys the matched samples will include about 107 stars and 106 galaxies observed by both SDSS and 2MASS, and about 250,000 galaxies and 50,000 quasars observed by both SDSS and FIRST. Here we present a preliminary analysis of the optical, infrared and radio properties for the extragalactic sources from the matched samples. In particular, we find that the fraction of quasars with stellar colors missed by the SDSS spectroscopic survey is probably not larger than ~10%, and that the optical colors of radio-loud quasars are ~0.05 mag. redder (with 4σ significance) than the colors of radio-quiet quasars.

Type
Part 2. Infrared and Submillimeter Surveys for AGN
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 137 - 146
Copyright
Copyright © Astronomical Society of the Pacific 2002

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