8–13 Sept 2019
Europe/Rome timezone
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Spectral atlas of the XMM-CDFS deep survey

13 Sept 2019, 17:48
2m

Speaker

Kazushi Iwasawa (ICREA and Universitat de Barcelona)

Description

XMM-Newton observed the Chandra Deep Field South (CDFS) with a ~3 Ms exposure time. EPIC spectra of bright 185 sources, practically all AGN with redshift up to z=3.8 , are compiled and their basic properties are studied by conventional spectral fitting, as well as an exploratory analysis with two, rest-frame X-ray colours and the Fe K line strength indicator and rest-frame spectral stacking. A significant proportion of the sample shows X-ray absorption, as expected. The nH distribution agrees with that has been found in various X-ray surveys. We find a Compton thick AGN fraction to be ~4%. Obscured AGN fraction shows a clear evolution and we attribute it to increasing gas content in galaxies towards high redshift. For unobscured AGN, broad Fe K line detection rate is ~30% in the brightest 21 subsample. The anti-correlation between the narrow Fe K EW and Lx (or the Iwasawa-Taniguchi effect) found in nearby AGN is not present in the XMM-CDFS unobscured AGN. However, this is probably due to a combination of the Lx-z bias and the evolution of the galaxy gas content suggested above.

Affiliation ICREA and Universitat de Barcelona
Topic Active Galactic Nuclei: accretion physics and evolution across cosmic time

Primary authors

Kazushi Iwasawa (ICREA and Universitat de Barcelona) Andrea Comastri (Istituto Nazionale di Astrofisica (INAF)) Cristian Vignali (Dipartimento di Fisica e Astronomia, Università di Bologna) Roberto Gilli (Istituto Nazionale di Astrofisica (INAF)) Giorgio Lanzuisi (1) DIFA Università di Bologna, 2) OAS-INAF) Prof. Niel Brandt (Penn State University) Marcella Brusa (Istituto Nazionale di Astrofisica (INAF)) Dr Ioannis Georgantopoulos (Athen Observatory) Dr Vincenzo Mainieri (ESO) Dr Simonetta Puccetti (ASI) Paolo Tozzi (Istituto Nazionale di Astrofisica (INAF)) Dr Piero Ranalli (Combient MiX AB)

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