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The XMM deep survey in the CDFS XI. X-ray spectral properties of 185 bright sources

Abstract: We present the X-ray spectra of 185 bright sources detected in the XMM-Newton deep survey of the Chandra Deep Field South with the three EPIC cameras combined. The 2?10 keV flux limit of the sample is 2 × 10?15 erg s?1 cm?2. The sources are distributed over a redshift range of z?=?0.1?3.8, with 11 new X-ray redshift measurements included. A spectral analysis was performed using a simple model to obtain absorbing column densities, rest-frame 2?10 keV luminosities, and Fe K line properties of 180 sources at z?>?0.4. Obscured AGN are found to be more abundant toward higher redshifts. Using the XMM-Newton data alone, seven Compton-thick AGN candidates were identified, which set the Compton-thick AGN fraction at ?4%. An exploratory spectral inspection method with two rest-frame X-ray colours and an Fe line strength indicator was introduced and tested against the results from spectral fitting. This method works reasonably well to characterise a spectral shape and can be useful for a pre-selection of Compton-thick AGN candidates. We found six objects exhibiting broad Fe K lines out of 21 unobscured AGN of best data quality, implying a detection rate of ?30%. Five redshift spikes, each with more than six sources, are identified in the redshift distribution of the X-ray sources. Contrary to the overall trend, the sources at the two higher redshift spikes, at z?=?1.61 and z?=?2.57, exhibit a puzzlingly low obscuration.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Astronomy & Astrophysics, 2020, 639, A51

Editorial: EDP Sciences

 Fecha de publicación: 01/07/2020

Nº de páginas: 26

Tipo de publicación: Artículo de Revista

 DOI: 10.1051/0004-6361/201937246

ISSN: 0004-6361,1432-0746

 Proyecto español: AYA2015-64346-C2-1P

Url de la publicación: https://doi.org/10.1051/0004-6361/201937246

Autoría

IWASAWA, K.

COMASTRI, A.

VIGNALI, C.

GILLI, R.

LANZUISI, G.

BRANDT, W. N.

TOZZI, P.

BRUSA, M.

MAINIERI, V.

GEORGANTOPOULOS, I.

PUCCETTI, S.

PAOLILLO, M.