Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/24362
Title: | On the relation between X-ray absorption and optical extinction in AGN | Authors: | Ordovás-Pascual, Ignacio Mateos, Silvia Carrera, Francisco J. Wiersema, Klaas CACCIANIGA, Alessandro SEVERGNINI, Paola DELLA CECA, Roberto BALLO, Lucia MORETTI, Alberto |
Issue Date: | 2016 | Volume: | Active Galactic Nuclei: What's in a Name? | First Page: | 104 | Abstract: | According to the Unified Model of Active Galactic Nuclei (AGN), an X-ray unabsorbed AGN should appear as unobscured in the optical (Type-1) and viceversa (Type-2). However, there is an important fraction (10-30%) of AGN whose optical and X-ray classifications do not match. To provide insight into the origin of such apparent discrepancies, we have conducted two analyses: 1) a detailed study of the UV-to-near-IR emission of two X-ray unabsorbed Type-2 AGN drawn from the Bright Ultra-Hard XMM-Newton Survey (BUXS); 2) a statistical analysis of the optical obscuration and X-ray absorption properties of 159 Type-1 AGN drawn from BUXS to determine the distribution of dust-to-gas ratios in AGN over a broad range of luminosities and redshifts. In our works we have also determined the impact of contamination from the AGN hosts in the optical classification of AGNs. Our studies are already provided very exciting results such as the detection of objects with extreme dust-to-gas ratios, between 300-10000 times below the Galactic dust-to-gas ratio. | Conference Name: | Active Galactic Nuclei: what's in a name? | Conference Place: | Garching | Conference Date: | June 27, 2016 - July 1, 2016 | URI: | http://hdl.handle.net/20.500.12386/24362 | URL: | https://zenodo.org/record/60640#.Xp_5l5mxU2w | DOI: | 10.5281/zenodo.60640 | Bibcode ADS: | 2016agnw.confE.104O | Fulltext: | open |
Appears in Collections: | 4.09 Prodotti multimediali |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
AGN2016_Poster_ordovas-pascual.pdf | poster | 1.09 MB | Adobe PDF | View/Open |
Page view(s)
106
checked on Apr 25, 2024
Download(s)
41
checked on Apr 25, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.