A Large Population of Obscured AGN in Disguise as Low-luminosity AGN in Chandra Deep Field South

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dc.contributor.authorLambrides, Erini L.
dc.contributor.authorChiaberge, Marco
dc.contributor.authorHeckman, Timothy
dc.contributor.authorGilli, Roberto
dc.contributor.authorVito, Fabio
dc.contributor.authorNorman, Colin
dc.date.accessioned2025-01-23T19:49:28Z
dc.date.available2025-01-23T19:49:28Z
dc.date.issued2020
dc.description.abstractPopulation synthesis models of actively accreting supermassive black holes (or active galactic nuclei (AGN)) predict a large fraction that must grow behind dense, obscuring screens of gas and dust. Deep X-ray surveys are thought to have provided the most complete and unbiased samples of AGN, but there is strong observational evidence that a portion of the population of obscured AGN is being missed. In this paper, we use a sample of AGN derived from the deepest X-ray survey to date, the Chandra 7 Ms GOODS-South Survey, to investigate the nature of low-flux X-ray sources. We make full use of the extensive multiwavelength coverage of the GOODS-South field and cross-match our objects with wavelengths from the radio to the IR. We find that the low X-ray flux AGN in our sample have X-ray luminosities that indicate low-luminosity AGN classification, while their radio, IR, and optical counterparts indicate moderate to powerful AGN classification. We find that the predicted column densities are, on average, an order of magnitude higher than the calculated column densities via X-ray detections for X-ray-faint sources. We interpret our results as evidence of obscured AGN disguised as low-luminosity AGN via their X-ray luminosities. When we compare the estimation of the obscured AGN space density with and without these objects, we find a difference of 40% in the lowest X-ray luminosity regime probed by our sample.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ab919c
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ab919c
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100505
dc.identifier.wosidWOS:000553807300001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectActive galactic nuclei
dc.subjectAGN host galaxies
dc.subjectActive galaxies
dc.subjectX-ray active galactic nuclei
dc.subjectOptical observation
dc.subjectInfrared sources
dc.subjectExtragalactic radio sources
dc.subjectSurveys
dc.titleA Large Population of Obscured AGN in Disguise as Low-luminosity AGN in Chandra Deep Field South
dc.typeartículo
dc.volumen897
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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