Using a complete spectroscopic survey to find red quasars and test the KX method

Jurek, Russell J., Drinkwater, Michael J., Francis, Paul J. and Pimbblet, Kevin A. (2008) Using a complete spectroscopic survey to find red quasars and test the KX method. Monthly Notices of the Royal Astronomical Society, 383 2: 673-682. doi:10.1111/j.1365-2966.2007.12567.x

Author Jurek, Russell J.
Drinkwater, Michael J.
Francis, Paul J.
Pimbblet, Kevin A.
Title Using a complete spectroscopic survey to find red quasars and test the KX method
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2007.12567.x
Open Access Status DOI
Volume 383
Issue 2
Start page 673
End page 682
Total pages 10
Editor A. C. Fabian
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract We present an investigation of quasar colour–redshift parameter space in order to search for radio-quiet red quasars and to test the ability of a variant of the KX quasar selection method to detect quasars over a full range of colour without bias. This is achieved by combining InfraRed Imager and Spectrograph 2 imaging with the complete Fornax Cluster Spectroscopic Survey to probe parameter space unavailable to other surveys. We construct a new sample of 69 quasars with measured bJ−K colours. We show that the colour distribution of these quasars is significantly different from that of the Large Bright Quasar Survey's quasars at a 99.9 per cent confidence level. We find 11 of our sample of 69 quasars have significantly red colours (bJ−K≥ 3.5) and from this, we estimate the red quasar fraction of the K≤ 18.4 quasar population to be 31 per cent, and robustly constrain it to be at least 22 per cent. We show that the KX method variant used here is more effective than the UVX selection method, and has less colour bias than optical colour–colour selection methods.
Keyword techniques : photometric
galaxies: active
quasars: general
infrared: galaxies
X-rays: diffuse background
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 30 Mar 2009, 21:37:16 EST by Jo Hughes on behalf of School of Mathematics & Physics