Estamos realizando la búsqueda. Por favor, espere...


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

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 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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: MNRAS 469, 693-704 (2017)

Editorial: Oxford University Press

 Año de publicación: 2017

Nº de páginas: 12

Tipo de publicación: Artículo de Revista

 DOI: 10.1093/mnras/stx862

ISSN: 0035-8711,1365-2966

Proyecto español: AYA2015-64346-C2-1-P; AYA2016-76730-P

Url de la publicación: https://doi.org/10.1093/mnras/stx862