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Autordc.contributor.authorTreister, Ezequiel 
Autordc.contributor.authorCastander, Francisco J. es_CL
Autordc.contributor.authorMaccarone, Thomas J. es_CL
Autordc.contributor.authorGawiser, Eric es_CL
Autordc.contributor.authorCoppi, Paolo S. es_CL
Autordc.contributor.authorUrry, C. Megan es_CL
Autordc.contributor.authorMaza Sancho, José es_CL
Autordc.contributor.authorHerrera, David es_CL
Autordc.contributor.authorGonzález, Valentino es_CL
Autordc.contributor.authorMontoya, Carlos es_CL
Autordc.contributor.authorPineda Bravo, Pedro es_CL
Fecha ingresodc.date.accessioned2014-01-09T18:46:54Z
Fecha disponibledc.date.available2014-01-09T18:46:54Z
Fecha de publicacióndc.date.issued2005-03-01
Cita de ítemdc.identifier.citationASTROPHYSICAL JOURNAL Volume: 621 Issue: 1 Pages: 104-122 Part: 1 Published: MAR 1 2005en_US
Identificadordc.identifier.otherDOI: 10.1086/427471
Identificadordc.identifier.urihttps://repositorio.uchile.cl/handle/2250/126134
Nota generaldc.descriptionArtículo de publicación ISIen_US
Resumendc.description.abstractWe present the first results from the Calan-Yale Deep Extragalactic Research (CYDER) survey. The main goal of this survey is to study serendipitous X-ray sources detected by Chandra in an intermediate flux range (10(-15) to 10(-12) ergs s(-1)) that comprises most of the X-ray background. A total of 267 X-ray sources spread over five archived fields were detected. The log N-log S distribution obtained for this sample is consistent with the results of other surveys. Deep V and I images were taken of these fields in order to calculate X-ray-to-optical flux ratios. Identifications and redshifts were obtained for 106 sources using optical spectroscopy from 8 m class telescopes to reach the optically faintest sources, to the same level as deeper X-ray fields like the Chandra Deep Fields, showing that the nature of sources detected depends mostly on the optical limit for spectroscopy. In general, sources optically classified as obscured active galactic nuclei (AGNs) have redder optical colors than unobscured AGNs. A rough correlation between f(X)/f(opt) and hard X-ray luminosity was found for obscured AGNs, confirming the prediction by existing models that in obscured AGNs the optical light is completely dominated by the host galaxy. The previously claimed decrease of the obscured-to-unobscured AGN ratio with increasing X-ray luminosity is observed. However, this correlation can be explained as a selection effect caused by the lower optical flux of obscured AGNs. Comparison between the observed N(H) distribution and predictions by existing models shows that the sample appears complete up to N(H) < 3 x 10(22) cm(-2), while for more obscured sources incompleteness plays an important role in the observed obscured-to-unobscured AGN ratio.en_US
Idiomadc.language.isoenen_US
Publicadordc.publisherIOP PUBLISHINGen_US
Tipo de licenciadc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
Link a Licenciadc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/*
Palabras clavesdc.subjectgalaxies : activeen_US
Títulodc.titleThe Calan-Yale Deep Extragalactic Research (CYDER) survey: Optical properties and deep spectroscopy of serendipitous X-ray sourcesen_US
Tipo de documentodc.typeArtículo de revista


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