Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26674
Title: | AGNs with discordant optical and X-ray classification are not a physical family: diverse origin in two AGNs | Authors: | Ordovás-Pascual, I. Mateos, S. Carrera, F. J. Wiersema, K. Barcons, X. BRAITO, Valentina CACCIANIGA, Alessandro Del Moro, A. DELLA CECA, Roberto SEVERGNINI, Paola |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 469 | Issue: | 1 | First Page: | 693 | Abstract: | Approximately 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 A<SUB>V</SUB>/N<SUB>H</SUB> 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. | URI: | http://hdl.handle.net/20.500.12386/26674 | URL: | https://arxiv.org/pdf/1704.01595.pdf https://academic.oup.com/mnras/article/469/1/693/3192211 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx862 | Bibcode ADS: | 2017MNRAS.469..693O | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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stx862.pdf | PDF editoriale | 2.91 MB | Adobe PDF | View/Open |
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