The large area KX quasar catalogue: I. Analysis of the photometric redshift selection and the complete quasar catalogue
Natasha Maddox, Paul C. Hewett, Celine Peroux, Daniel B. Nestor and, Lutz Wisotzki

TL;DR
This paper presents a large-area K-band flux-limited spectroscopic survey for luminous quasars, combining photometric redshift selection with the KX method, resulting in a highly complete and efficient quasar catalogue useful for studying dust extinction effects.
Contribution
It introduces a new, well-defined quasar catalogue based on KX selection, improving completeness and efficiency over previous surveys, and provides insights into dust reddening in luminous quasars.
Findings
>95% completeness and efficiency in quasar selection
Sample includes over 3200 known and 250 new quasars
Provides a dataset to study dust extinction in quasars
Abstract
The results of a large area, ~600 deg^2, K-band flux-limited spectroscopic survey for luminous quasars are presented. The survey utilises the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) in regions of sky within the Sloan Digital Sky Survey (SDSS) footprint. The K-band excess (KX) of all quasars with respect to Galactic stars is exploited in combination with a photometric redshift/classification scheme to identify quasar candidates for spectroscopic follow-up observations. The data contained within this investigation will be able to provide new constraints on the fraction of luminous quasars reddened by dust with E(B-V)<=0.5 mag. The spectroscopic sample is defined using the K-band, 14.0<=K<=16.6, and SDSS i-band limits of i=19.5, 19.7 and 22.0 over sky areas of 287, 150 and 196 deg^2, respectively. The survey includes >3200 known quasars from the SDSS and more than…
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