Counts of Low-redshift SDSS Quasar Candidates

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dc.creatorIvezic, Z.
dc.creatorLupton, R. H.
dc.creatorJohnston, D. E.
dc.creatorRichards, G. T.
dc.creatorHall, P. B.
dc.creatorSchlegel, D.
dc.creatorFan, X.
dc.creatorMunn, J. A.
dc.creatorYanny, B.
dc.creatorStrauss, M. A.
dc.creatorKnapp, G. R.
dc.creatorGunn, J. E.
dc.creatorSchneider, D. P.
dc.date2003-10-20
dc.date.accessioned2026-07-07T02:10:40Z
dc.date.available2026-07-07T02:10:40Z
dc.descriptionWe analyze the counts of low-redshift quasar candidates selected using nine-epoch SDSS imaging data. The co-added catalogs are more than 1 mag deeper than single-epoch SDSS data, and allow the selection of low-redshift quasar candidates using UV-excess and also variability techniques. The counts of selected candidates are robustly determined down to g=21.5. This is about 2 magnitudes deeper than the position of a change in the slope of the counts reported by Boyle et al. (1990, 2000) for a sample selected by UV-excess, and questioned by Hawkins & Veron (1995), who utilized a variability-selected sample. Using SDSS data, we confirm a change in the slope of the counts for both UV-excess and variability selected samples, providing strong support for the Boyle et al. results.
dc.descriptionto be published in the Proceedings of "AGN Physics with the SDSS"
dc.identifierhttps://arxiv.org/abs/astro-ph/0310566
dc.identifierhttp://arxiv.org/abs/astro-ph/0310566
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/6813
dc.subjectAstrophysics
dc.titleCounts of Low-redshift SDSS Quasar Candidates
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