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Title

AGNs with discordant optical and X-ray classification are not a physical family: diverse origin in two AGNs

AuthorsOrdovás-Pascual, I. ; Mateos, Silvia ; Carrera, Francisco J. ; Wiersema, Klass; Barcons, Xavier ; Braito, V.; Caccianiga, A.; Moro, A. del; Della Ceca, R.; Severgnini, P.
KeywordsGalaxies: active
Galaxies: nuclei
Galaxies: Seyfert
X-rays: galaxies
Issue Date2017
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 469(1): 693-704 (2017)
AbstractApproximately 3-17 per cent of active galactic nuclei (AGNs) without detected rest-frame UV/optical broad emission lines (type-2 AGN) do not show absorption in X-rays. The physical origin behind the apparently discordant optical/X-ray properties is not fully understood. Our study aims at providing insight into this issue by conducting a detailed analysis of the nuclear dust extinction and X-ray absorption properties of two AGNs with low X-ray absorption and with high optical extinction, for which a rich set of high-quality spectroscopic data is available from XMM-Newton archive data in X-rays and XSHOOTER proprietary data at UV-to-NIR wavelengths. In order to unveil the apparent mismatch, we have determined the AV/NH and both the supermassive black hole and the host galaxy masses. We find that the mismatch is caused in one case by an abnormally high dust-to-gas ratio that makes the UV/optical emission to appear more obscured than in the X-rays. For the other object, we find that the dust-to-gas ratio is similar to the Galactic one but the AGN is hosted by a very massive galaxy so that the broad emission lines and the nuclear continuum are swamped by the star light and difficult to detect.
Publisher version (URL)https://doi.org/10.1093/mnras/stx862
URIhttp://hdl.handle.net/10261/169657
Identifiersdoi: 10.1093/mnras/stx862
issn: 0035-8711
e-issn: 1365-2966
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