The XMM deep survey in the CDF-S. VIII. X-ray properties of the two brightest sources

Journal
Date Issued
2015
Author(s)
Iwasawa, K.
•
Vignali, C.
•
•
•
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Brandt, W. N.
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Carrera, F. J.
•
•
Falocco, S.
•
Vagnetti, F.
DOI
Description
This research made use of the data obtained from XMM-Newton and the Chandra X-ray Observatory. We thank Matteo Guainazzi for providing us with the information on the XMM-Newton calibration status. We thank Kenta Matsuoka and Tohru Nagao for useful discussion on the optical data. K.I. acknowledges support by DGI of the Spanish Ministerio de Economía y Competitividad (MINECO) under grant AYA2013-47447-C3-2-P. W.N.B. thanks the NASA ADP grant NNX10AC99G. We acknowledge financial contribution from the agreement ASI-INAF I/009/10/0.
Abstract
We present results from the deep XMM-Newton observations of the two brightest X-ray sources in the Chandra Deep Field South (CDFS), PID 203 (z = 0.544) and PID 319 (z = 0.742). The long exposure of 2.5 Ms over a 10 year period (net 4 yr with a 6 yr gap) makes it possible to obtain high quality X-ray spectra of these two Type I AGN with X-ray luminosity of 1044 erg s-1, which is the typical luminosity for low-redshift PG quasars, and track their X-ray variability both in flux and spectral shape. Both sources showed X-ray flux variability of ~10-20% in rms, which is similar in the soft (0.5-2 keV) and hard (2-7 keV) bands. PID 203, which has evidence for optical extinction, shows modest amount of absorption (NH≤ 1 × 1021 cm-2) in the X-ray spectrum. Fe K emission is strongly detected in both objects with EW ~ 0.2 keV. The lines in both objects are moderately broad and exhibit marginal evidence for variability in shape and flux, indicating that the bulk of the line emission comes from their accretion disks rather than distant tori.
Volume
574
Start page
A144
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2015A&A...574A.144I
Rights
open.access
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