Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 431, Issue 1, Pages 978-996Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt222
Keywords
galaxies: active; galaxies: high-redshift; galaxies: nuclei; X-rays: galaxies
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Funding
- ASI-INAF [I/009/10/0]
- NASA Chandra grant [GO7-8136A]
- Blancheflor Boncompagni Ludovisi foundation
- Smithsonian Scholarly Studies
- ESA Member States
- NASA
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We present the X-ray spectral analysis of the 390 brightest extragalactic sources in the Chandra-Cosmic Evolution Survey catalogue, showing at least 70 net counts in the 0.5-7 keV band. This sample has a 100 per cent completeness in optical-infrared identification, with similar to 75 per cent of the sample having a spectroscopic redshift and similar to 25 per cent a photometric redshift. Our analysis allows us to accurately determine the intrinsic absorption, the broad-band continuum shape (Gamma) and intrinsic L2-10 distributions, with an accuracy better than 30 per cent on the spectral parameters for 95 per cent of the sample. The sample is equally divided in type 1 (49.7 per cent) and type 2 active galactic nuclei (48.7 per cent) plus few passive galaxies at low z. We found a significant difference in the distribution of Gamma of type 1 and type 2, with small intrinsic dispersion, a weak correlation of Gamma with L2-10 and a large population (15 per cent of the sample) of high luminosity, highly obscured (QSO2) sources. The distribution of the X-ray/Optical flux ratio (Log(F-X/F-i)) for type 1 is narrow (0 < X/O < 1), while type 2 are spread up to X/O = 2. The X/O correlates well with the amount of X-ray obscuration. Finally, a small sample of Compton-thick candidates and peculiar sources is presented. In the appendix, we discuss the comparison between Chandra and XMM-Newton spectra for 280 sources in common. We found a small systematic difference, with XMM-Newton spectra that tend to have softer power laws and lower obscuration.
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