| | |
| | |
Stat |
Members: 3643 Articles: 2'487'895 Articles rated: 2609
28 March 2024 |
|
| | | |
|
Article overview
| |
|
The X-ray to optical-UV luminosity ratio of X-ray selected Type 1 AGN in XMM-COSMOS | E. Lusso
; A. Comastri
; C. Vignali
; G. Zamorani
; M. Brusa
; R. Gilli
; K. Iwasawa
; M. Salvato
; F. Civano
; M. Elvis
; A. Merloni
; A. Bongiorno
; J.R. Trump
; A.M. Koekemoer
; E. Schinnerer
; E. Le Floc'h
; N. Cappelluti
; K. Jahnke
; M. Sargent
; J. Silverman
; V. Mainieri
; F. Fiore
; M. Bolzonella
; O. Le Fèvre
; B. Garilli
; A. Iovino
; J.P. Kneib
; F. Lamareille
; S. Lilly
; M. Mignoli
; M. Scodeggio
; D. Vergani
; | Date: |
21 Dec 2009 | Abstract: | We present a study of the X-ray to optical properties of a sample of 545
X-ray selected Type 1 AGN, from the XMM-COSMOS survey, over a wide range of
redshifts ($0.04<z<4.25$) and X-ray luminosities ($40.6 leq Log Lhard leq
45.3$). About 60% of them are spectroscopically identified Type 1 AGN, while
the others have a reliable photometric redshift and are classified as Type 1
AGN on the basis of their multi-band Spectral Energy Distributions. We discuss
the relationship between UV and X-ray luminosity, as parameterized by the
$alphaox$ spectral slope, and its dependence on redshift and luminosity. We
compare our findings with previous investigations of optically selected
broad-line AGN (mostly from SDSS). A highly significant correlation between
$alphaox$ and $lo$ is found, in agreement with previous investigations of
optically selected samples. We calculate bolometric corrections, $kbol$, for
the whole sample using hard X-ray luminosities ($Lhard$), and the Eddington
ratios for a subsample of 150 objects for which black hole mass estimates are
available. We confirm the trend of increasing bolometric correction with
increasing Eddington ratio as proposed in previous works. A tight correlation
is found between $alphaox$ and $kbol$, which can be used to estimate accurate
bolometric corrections using only optical and X-ray data. We find a significant
correlation between $alphaox$ and Eddington ratio, in which $alphaox$
increases for increasing Eddington ratios. | Source: | arXiv, 0912.4166 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |