A Large Population of Obscured AGN in Disguise as Low-luminosity AGN in Chandra Deep Field South
Lambrides,Erini L.1; Chiaberge,Marco1,2; Heckman,Timothy1; Gilli,Roberto3; Vito,Fabio4,5; Norman,Colin1,2
Source PublicationThe Astrophysical Journal
AbstractAbstract Population 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.
KeywordActive galactic nuclei AGN host galaxies Active galaxies X-ray active galactic nuclei Optical observation Infrared sources Extragalactic radio sources Surveys
WOS IDIOP:0004-637X-897-2-ab919c
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Physics & Astronomy, Johns Hopkins University, Bloomberg Center, 3400 North Charles Street, Baltimore, MD 21218, USA
2.Space Telescope Science Institute, 3700 San Martin Drive Baltimore, MD 21218, USA
3.INAF–Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via P. Gobetti 93/3, I-40129, Bologna, Italy
4.Instituto de Astrofísica and Centro de Astroingeniería, Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
5.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing 100012, People’s Republic Of China
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Lambrides,Erini L.,Chiaberge,Marco,Heckman,Timothy,et al. A Large Population of Obscured AGN in Disguise as Low-luminosity AGN in Chandra Deep Field South[J]. The Astrophysical Journal,2020,897(2).
APA Lambrides,Erini L.,Chiaberge,Marco,Heckman,Timothy,Gilli,Roberto,Vito,Fabio,&Norman,Colin.(2020).A Large Population of Obscured AGN in Disguise as Low-luminosity AGN in Chandra Deep Field South.The Astrophysical Journal,897(2).
MLA Lambrides,Erini L.,et al."A Large Population of Obscured AGN in Disguise as Low-luminosity AGN in Chandra Deep Field South".The Astrophysical Journal 897.2(2020).
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