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|Title:||The XMM deep survey in the CDFS. XI. X-ray spectral properties of 185 bright sources||Authors:||Iwasawa, K.
Brandt, W. N.
Carrera, F. J.
|Issue Date:||2020||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||639||First Page:||A51||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<SUP>-15</SUP> erg s<SUP>-1</SUP> cm<SUP>-2</SUP>. 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. <P />Full Table 1 and data for Fig. 2 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://22.214.171.124) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/639/A51">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/639/A51</A>||URI:||http://hdl.handle.net/20.500.12386/31101||URL:||https://www.aanda.org/articles/aa/full_html/2020/07/aa37246-19/aa37246-19.html
|Appears in Collections:||1.01 Articoli in rivista|
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