2008A&A...489..967B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST16:04:17

2008A&A...489..967B - Astronomy and Astrophysics, volume 489, 967-979 (2008/10-3)

Intra cluster medium properties and AGN distribution in high-z RCS clusters.

BIGNAMINI A., TOZZI P., BORGANI S., ETTORI S. and ROSATI P.

Abstract (from CDS):

The study of the thermodynamical and chemical properties of the intra cluster medium (ICM) in high redshift clusters of galaxies is a powerful tool for investigating the formation and evolution of large scale structures. Here we discuss the X-ray properties of clusters of galaxies optically selected in the red-sequence cluster survey (RCS) observed with the Chandra satellite, at redshifts 0.6<z<1.2. We intend to assess the evolutionary stage of optically selected high-z clusters of galaxies, performing a spectral analysis of the diffuse emission from their ICM. We also investigate the distribution of active galactic nuclei (AGN) in their surroundings. The background subtracted spectra were analyzed and fitted with a single temperature model to measure average ICM temperature, X-ray bolometric luminosity and Fe abundance within typical radii between 200 and 350kpc. We also analyzed the point source number density and spatial distribution in the RCS clusters fields as a function of the X-ray flux. We detected emission for the majority of the clusters, except for three, for which we have only marginal detection at ∼3σ. We find that the normalization of the luminosity-temperature relation for RCS clusters is a factor of ∼2 lower than the one for X-ray selected clusters. We confirm that the Fe abundance in the detected objects is consistent with that of X-ray selected clusters at the same redshift. We also find an excess of low-luminosity AGN towards the center of the clusters. At z∼1, optically selected clusters with a well-defined red-sequence show extended X-ray emission in about 70% (8/11) of the cases. Nevertheless, their LX-TX relation is significantly lower with respect to X-ray selected clusters at the same redshift, possibly indicating an incomplete virialization. The Fe abundance measured in the ICM of RCS clusters is comparable to the values measured for X-ray selected clusters at the same redshift, implying a substantial enrichment by SNe products. These two evidences add to the previously known studies of high-z, X-ray selected clusters, to confirm that the thermodynamical and chemical properties of the ICM are substantially established already at z>1. Finally, we find the significant excess of medium and low luminosity AGN close to the centroid of the X-ray emission. Their X-ray emission is not dominating the ICM, but their presence may be relevant for studying the interaction between AGN and ICM.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: high-redshift - cosmology: observations - X-rays: galaxies: clusters - intergalactic medium - galaxies: active

CDS comments: In Appendix A RCS 1107.3+0523 is a misprint for RCS 1107.3-0523.

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 ClG J0224-0002 ClG 02 24 34.10 -00 02 30.9           ~ 46 1
2 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1750 1
3 ClG J0439-2905 ClG 04 39 38.0 -29 04 55           ~ 6 0
4 RCS J1107-0523 ClG 11 07 22.8 -05 23 49           ~ 9 0
5 RCS J1325+2858 ClG 13 26 31.040 +29 03 52.02           ~ 3 0
6 RCS J141658+5305.2 ClG 14 16 58.7 +53 05 15           ~ 4 0
7 ClG J1419+5326 ClG 14 19 10.3 +53 26 08           ~ 20 0
8 ClG J1620+2929 ClG 16 20 09.4 +29 29 26           ~ 17 0
9 RCS J2112.3-6326 ClG 21 12 20.510 -63 26 13.97           ~ 3 0
10 ClG J2156-0448 ClG 21 56 41 -04 48.1           ~ 13 0
11 RCS J2318+0034 ClG 23 18 30.670 +00 34 03.03           ~ 15 0
12 ClG J2319+0038 ClG 23 19 53 +00 38.0           ~ 35 1

    Equat.    Gal    SGal    Ecl

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2019.10.21-16:04:17

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