2011A&A...526L...9C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:03:45

2011A&A...526L...9C - Astronomy and Astrophysics, volume 526, L9-9 (2011/2-1)

The XMM deep survey in the CDF-S. I. First results on heavily obscured AGN.

COMASTRI A., RANALLI P., IWASAWA K., VIGNALI C., GILLI R., GEORGANTOPOULOS I., BARCONS X., BRANDT W.N., BRUNNER H., BRUSA M., CAPPELLUTI N., CARRERA F.J., CIVANO F., FIORE F., HASINGER G., MAINIERI V., MERLONI A., NICASTRO F., PAOLILLO M., PUCCETTI S., ROSATI P., SILVERMAN J.D., TOZZI P., ZAMORANI G., BALESTRA I., BAUER F.E., LUO B. and XUE Y.Q.

Abstract (from CDS):

We present the first results of the spectroscopy of distant, obscured AGN as obtained with the ultra-deep (≃3.3Ms) XMM-Newton survey in the Chandra deep field South. One of the primary goals of the project is to characterize the X-ray spectral properties of obscured and heavily obscured Compton-thick AGN over the range of redhifts and luminosities that are relevant in terms of their contribution to the X-ray background. The ultra-deep exposure, coupled with the XMM detector's spectral throughput, allowed us to accumulate good quality X-ray spectra for a large number of X-ray sources and, in particular, for heavily obscured AGN at cosmological redshifts. Specifically we present the X-ray spectral properties of two high-redshift - z=1.53 and z=3.70 - sources. The XMM spectra of both are very hard, with a strong iron Kα line at a rest-frame energy of ∼6.4keV. A reflection-dominated continuum provides the best description of the X-ray spectrum of the z=1.53 source, while the intrinsic continuum of the z=3.70 AGN is obscured by a large column NH≃1024cm–2 of cold gas. Compton-thick absorption, or close to it, is unambiguously detected in both sources. Interestingly, these sources would not be selected as candidate Compton thick AGN by some multiwavelength selection criteria based on the mid-infrared to optical and X-ray to optical flux ratios.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: high-redshift - X-rays: galaxies - X-rays: diffuse background

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4093 2
2 [SWM2014] GOODS-S 13628 Sy2 03 32 18.3389 -27 50 55.176   24.89 24.190 23.82 23.039 ~ 69 0
3 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1812 1
4 [VV2006] J033229.9-275106 Sy2 03 32 29.8487 -27 51 05.879   27.6 25.05 23.970 24.54 ~ 84 0
5 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 614 0
6 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 610 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:03:45

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