Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/34672
Title: | The XMM-Newton Bright Survey sample of absorbed quasars: X-ray and accretion properties | Authors: | Ballo, L. SEVERGNINI, Paola DELLA CECA, Roberto CACCIANIGA, Alessandro Vignali, C. Carrera, F. J. Corral, A. Mateos, S. |
Issue Date: | 2014 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 444 | Issue: | 3 | First Page: | 2580 | Abstract: | Although absorbed quasars are extremely important for our understanding of the energetics of the Universe, the main physical parameters of their central engines are still poorly known. In this work, we present and study a complete sample of 14 quasars (QSOs) that are absorbed in the X-rays (column density NH > 4 × 1021 cm-2 and X-ray luminosity L 2-10 keV > 1044 ergs-1; XQSO2) belonging to the XMM-Newton Bright Serendipitous Survey (XBS). From the analysis of their ultraviolet-to-mid-infrared spectral energy distribution, we can separate the nuclear emission from the host galaxy contribution, obtaining a measurement of the fundamental nuclear parameters, like the mass of the central supermassive black hole and the value of Eddington ratio, λ Edd. Comparing the properties of XQSO2s with those previously obtained for the X-ray unabsorbed QSOs in the XBS, we do not find any evidence that the two samples are drawn from different populations. In particular, the two samples span the same range in Eddington ratios, up to λ Edd ∼ 0.5; this implies that our XQSO2s populate the `forbidden region' in the so-called `effective Eddington limit paradigm'. A combination of low grain abundance, presence of stars inwards of the absorber, and/or anisotropy of the disc emission can explain this result. | URI: | http://hdl.handle.net/20.500.12386/34672 | URL: | http://arxiv.org/abs/1408.7037v1 https://academic.oup.com/mnras/article/444/3/2580/1064823 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stu1628 | Bibcode ADS: | 2014MNRAS.444.2580B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2014MNRAS_444_2580.pdf | PDF editoriale | 1.33 MB | Adobe PDF | View/Open |
Page view(s)
10
checked on Apr 27, 2024
Download(s)
3
checked on Apr 27, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.