Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/109109
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Simultaneous X-ray and optical observations of true type 2 Seyfert galaxies |
Autor: | Bianchi, Stefano; Panessa, Francesca CSIC ORCID; Barcons, Xavier CSIC ORCID ; Carrera, Francisco J. CSIC ORCID CVN ; La Franca, Fabio; Matt, Giorgio; Onori, Francesca; Wolter, Anna; Corral, Amalia CSIC ORCID ; Monaco, Lorenzo; Ruiz Camuñas, A. CSIC ORCID; Brightman, Murray | Palabras clave: | Galaxies: active Galaxies: Seyfert |
Fecha de publicación: | 2012 | Editor: | Oxford University Press Royal Astronomical Society |
Citación: | Monthly Notices of the Royal Astronomical Society 426(4): 3225-3240 (2012) | Resumen: | We present the results of a campaign of simultaneous X-ray and optical observations of 'true' type 2 Seyfert galaxies candidates, i.e. active galactic nuclei without a broad-line region (BLR). Out of the initial sample composed of eight sources, one object, IC 1631, was found to be a misclassified starburst galaxy, another, Q2130-431, does show broad optical lines, while other two, IRAS 01428-0404 and NGC 4698, are very likely absorbed by Compton-thick gas along the line of sight. Therefore, these four sources are not unabsorbed Seyfert 2s as previously suggested in the literature. On the other hand, we confirm that NGC 3147, NGC 3660 and Q2131-427 belong to the class of true type 2 Seyfert galaxies, since they do not show any evidence for a broad component of the optical lines nor for obscuration in their X-ray spectra. These three sources have low accretion rates (m˙ = Lbol/LEdd 0.01), in agreement with theoretical models which predict that the BLR disappears below a critical value of L bol/L Edd. The last source, Mrk 273x, would represent an exception even of these accretion-dependent versions of the Unification Models, due to its high X-ray luminosity and accretion rate, and no evidence for obscuration. However, its optical classification as a Seyfert 2 is only based on the absence of a broad component of Hβ, due to the lack of optical spectra encompassing the Hα band. | Versión del editor: | http://dx.doi.org/10.1111/j.1365-2966.2012.21959.x | URI: | http://hdl.handle.net/10261/109109 | DOI: | 10.1111/j.1365-2966.2012.21959.x | Identificadores: | doi: 10.1111/j.1365-2966.2012.21959.x issn: 0035-8711 e-issn: 1365-2966 |
Aparece en las colecciones: | (IFCA) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
true type 2 Seyfert.pdf | 2,93 MB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
44
checked on 20-abr-2024
WEB OF SCIENCETM
Citations
45
checked on 29-feb-2024
Page view(s)
363
checked on 23-abr-2024
Download(s)
352
checked on 23-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.