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2012MNRAS.419.3354F - Mon. Not. R. Astron. Soc., 419, 3354-3367 (2012/February-1)
Selection constraints on high-redshift quasar searches in the VISTA Kilo-degree Infrared Galaxy Survey.
FINDLAY J.R., SUTHERLAND W.J., VENEMANS B.P., REYLE C., ROBIN A.C., BONFIELD D.G., BRUCE V.A. and JARVIS M.J.
Abstract (from CDS):
In this paper, we alleviate this problem by supplementing initial data with a realistic model of the spatial, luminosity and colour distributions of sources known to heavily contaminate photometric quasar selection spaces, namely dwarf stars of spectral types M, L and T. We use this model along with a subset of available data to investigate contamination of quasar selection space by cool stars and galaxies and lay down a set of benchmark selection constraints that limit contamination to reasonable levels whilst maintaining high completeness as a function of both magnitude and redshift. We review recent follow-up imaging of the first VIKING high-z quasar candidates and find that the results lend considerable support for the choice of selection constraints. The methods outlined here are also applicable to rare object searches in a number of other ongoing and forthcoming projects.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): techniques: photometric - surveys - galaxies: high-redshift - quasars: general
Simbad objects: 2
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