The Chandra-COSMOS survey – IV. X-ray spectra of the bright sample
| Autor: | Tom Aldcroft, G. Zamorani, Luis C. Ho, Martin Elvis, Aneta Siemiginowska, Marcella Brusa, Antonella Fruscione, Cristian Vignali, Fabrizio Fiore, Mara Salvato, Vincenzo Mainieri, Andrea Merloni, G. Hasinger, Giorgio Lanzuisi, Roberto Gilli, Andrea Comastri, Francesca Civano |
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| Přispěvatelé: | Lanzuisi G., Civano F., Elvis M., Salvato M., Hasinger G., Vignali C., Zamorani G., Aldcroft T., Brusa M., Comastri A., Fiore F., Fruscione A., Gilli R., Ho L.C., Mainieri V., Merloni A., Siemiginowska A. |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Astrophysics::High Energy Astrophysical Phenomena galaxies: active X-ray GALAXIES: HIGH REDSHIFT FOS: Physical sciences Astronomy Astronomy and Astrophysics Small sample Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy Redshift Spectral line X-rays: galaxies Space and Planetary Science Spectral analysis galaxies: nuclei X ray spectra Astrophysics::Galaxy Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics Photometric redshift |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 431:978-996 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stt222 |
| Popis: | We present the X-ray spectral analysis of the 390 brightest extragalactic sources in the Chandra-COSMOS catalog, showing at least 70 net counts in the 0.5-7 keV band. This sample has a 100% completeness in optical-IR identification, with 75% of the sample having a spectroscopic redshift and 25% a photometric redshift. Our analysis allows us to accurately determine the intrinsic absorption, the broad band continuum shape ({\Gamma}) and intrinsic L(2-10) distributions, with an accuracy better than 30% on the spectral parameters for 95% of the sample. The sample is equally divided in type-1 (49.7%) and type-2 AGN (48.7%) 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 L(2-10) and a large population (15% of the sample) of high luminosity, highly obscured (QSO2) sources. The distribution of the X ray/Optical flux ratio (Log(FX /Fi)) 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. Comment: 20 pages, 16 figures. Accepted for Pubblication in MNRAS, 2013 February 5 |
| Databáze: | OpenAIRE |
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