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Searching for luminous absorbed sources in the WISE AGN catalogue

AuthorsMountrichas, G.; Georgantopoulos, I.; Ordovás-Pascual, I. CSIC ORCID CVN ; Corral, Amalia CSIC ORCID ; Akylas, A.; Mateos, Silvia CSIC ORCID ; Carrera, Francisco J. CSIC ORCID CVN ; Batziou, E.
KeywordsBlack hole physics
Galaxies: Seyfert
Galaxies: haloes
Quasars: general
Galaxies: active
Issue Date2017
PublisherRoyal Astronomical Society
Oxford University Press
CitationMonthly Notices of the Royal Astronomical Society 468(3): 3042-3050 (2017)
AbstractMid-infrared (IR) colour selection techniques have proved to be very efficient in finding active galactic nuclei (AGN). This is because the AGN heats the surrounding dust producing warm mid-IR colours. Using the Wide-field Infrared Survey Explorer 3.6, 4.5 and 12 μm colours, the largest sample of IR selected AGN has already been produced containing 1.4 million AGN over the whole sky. Here, we explore the X-ray properties of this AGN sample by cross-correlating it with the subsample of the 3XMM X-ray catalogue that has available X-ray spectra and at the same time optical spectroscopy from Sloan Digital Sky Survey (SDSS). Our goal is to find rare luminous obscured AGN. Our final sample contains 65 QSOs with log νLν ≥ 46.2 erg s−1. This IR luminosity cut corresponds to log  LX ≈ 45 erg s−1, at the median redshift of our sample (z = 2.3), that lies at the bright end of the X-ray luminosity function at z > 2. The X-ray spectroscopic analysis reveals seven obscured AGN having a column density NH > 1022 cm−2. Six of them show evidence for broad [C IV] absorption lines and five are classified as broad absorption line QSOs. We fit the optical spectra of our X-ray absorbed sources to estimate the optical reddening. We find that none of these show any obscuration according to the optical continuum. These sources add to the growing evidence for populations of luminous QSOs with evidence for substantial absorption by outflowing ionized material, similar to those expected to be emerging from their absorbing cocoons in the framework of AGN/galaxy co-evolution.
Publisher version (URL)https://doi.org/10.1093/mnras/stx572
Identifiersdoi: 10.1093/mnras/stx572
issn: 0035-8711
e-issn: 1365-2966
Appears in Collections:(IFCA) Artículos
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