Did Most High-Redshift Quasars Escape Detection?

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dc.creatorWolf, C.
dc.creatorMeisenheimer, K.
dc.creatorRoeser, H. -J.
dc.creatorteam, CADIS
dc.date1998-12-22
dc.date.accessioned2026-07-07T02:29:46Z
dc.date.available2026-07-07T02:29:46Z
dc.descriptionWe present follow-up spectroscopy to the Calar Alto Deep Imaging Survey (CADIS), reporting on the quasars in the CADIS 16h-field, and including preliminary data from two other fields. In this 10' x 10' field we found six quasars at redshift z>2.2 which are brighter than R=22 mag, while surface densities determined in previous surveys are reported to be below one on average. This is the highest reported surface density of high-redshift quasars within the given limits. We believe this result to be a consequence of the multicolor database and the search technique used in CADIS. Our observations further seem to indicate that the density of high-redshift quasars is also higher than predicted by the luminosity function of Warren (1994) by a factor of three, implying that common search methods have overlooked the majority of high-redshift quasars at this magnitude level. In particular, an application of the V/V max test to our preliminary list of AGNs with R<22 mag and z<4 yields <V/V max> = 0.51 +-0.06, characterizing our preliminary redshift distribution as flat.
dc.description8 pages, accepted by Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9812409
dc.identifierhttp://arxiv.org/abs/astro-ph/9812409
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13599
dc.subjectAstrophysics
dc.titleDid Most High-Redshift Quasars Escape Detection?
dc.typetext

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