|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Compton Thick AGN in the XMM-COSMOS survey | | G. Lanzuisi
; P. Ranalli
; I. Georgantopoulos
; A. Georgakakis
; I. Delvecchio
; T. Akylas
; S. Berta
; A. Bongiorno
; M. Brusa
; N. Cappelluti
; F. Civano
; A. Comastri
; R. Gilli
; C. Gruppioni
; G. Hasinger
; K. Iwasawa
; A. Koekemoer
; E. Lusso
; S. Marchesi
; V. Mainieri
; A. Merloni
; M. Mignoli
; E. Piconcelli
; F. Pozzi
; D. J. Rosario
; M. Salvato
; J. Silverman
; B. Trakhtenbrot
; C. Vignali
; G. Zamorani
; | | Date: |
5 Sep 2014 | | Abstract: | Heavily obscured, Compton Thick (CT, NH>10^24 cm-2) AGN may represent an
important phase in AGN/galaxy co-evolution and are expected to provide a
significant contribution to the cosmic X-ray background (CXB) at its peak.
Through direct X-ray spectra analysis, we selected 39 heavily obscured AGN
(NH>3x10^23 cm-2) in the 2 deg^2 XMM-COSMOS survey. Thanks to deeper Chandra
data available in the field, we can define 10 of these sources as bona-fide CT,
spanning a large range of redshift and luminosity, and estimate the efficiency
of our selection to be of the order of 80%. We collected the multi-wavelength
information available for these sources, to study the distribution of BH mass
(MBH), Eddington ratio (lambda_Edd), stellar mass (M*), specific star formation
rate (sSFR) in comparison with a sample of unobscured AGN. We find that highly
obscured sources tend to have significantly smaller MBH and higher lambda_Edd
with respect to unobscured sources. The sSFR of highly obscured sources is
consistent with the one observed for main sequence star forming galaxies, at
all redshift. We also present and briefly discuss optical spectra, broad band
spectral energy distribution (SED) and morphology for the sample of 10 CT AGN.
Both the optical spectra and SED agree with the classification as highly
obscured sources: all the available optical spectra are dominated by the
stellar component of the host galaxy, and an highly obscured torus component is
needed in the SED of all the CT sources. Exploiting the high resolution Hubble
images, we show that these highly obscured sources have a significantly larger
merger fraction with respect to other X-ray selected samples of AGN. Finally we
discuss the implications of our findings in the context of AGN/galaxy
co-evolutionary models, and compare our results with the predictions of CXB
synthesis models. | | Source: | arXiv, 1409.1867 | | 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 Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER