2010ApJ...714L.181K


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET23:46:32

2010ApJ...714L.181K - Astrophys. J., 714, L181-L184 (2010/May-2)

Luminous X-ray active galactic nuclei in clusters of galaxies.

KOULOURIDIS E. and PLIONIS M.

Abstract (from CDS):

We present a study of X-ray active galactic nucleus (AGN) overdensities in 16 Abell clusters, within the redshift range 0.073 < z < 0.279, in order to investigate the effect of the hot inter-cluster environment on the triggering of the AGN phenomenon. The X-ray AGN overdensities, with respect to the field expectations, were estimated for sources with Lx≥ 1042 erg/s (at the redshift of the clusters) and within an area of 1 h–172Mpc radius (excluding the core). To investigate the presence or absence of a true enhancement of luminous X-ray AGNs in the cluster area, we also derived the corresponding optical galaxy overdensities, using a suitable range of r-band magnitudes. We always find the latter to be significantly higher (and only in two cases roughly equal) with respect to the corresponding X-ray overdensities. Over the whole cluster sample, the mean X-ray point-source overdensity is a factor of ∼4 less than that corresponding to bright optical galaxies, a difference which is significant at a >0.995 level, as indicated by an appropriate student's t-test. We conclude that the triggering of luminous X-ray AGNs in rich clusters is strongly suppressed. Furthermore, searching for optical Sloan Digital Sky Survey counterparts of all the X-ray sources, associated with our clusters, we found that about half appear to be background QSOs, while others are background and foreground AGNs or stars. The true overdensity of X-ray point sources, associated with the clusters, is therefore even smaller than what our statistical approach revealed.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: clusters: general - X-rays: galaxies - X-rays: galaxies: clusters - X-rays: general

Simbad objects: 16

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Number of rows : 16

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 ACO 267 ClG 01 52 41.96 +01 00 25.6           ~ 195 0
2 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 256 0
3 ACO 963 ClG 10 17 09.6 +39 01 00           ~ 346 0
4 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 182 0
5 ACO 1589 ClG 12 41 19.1 +18 34 16           ~ 86 0
6 ACO 1663 ClG 13 02 52.55 -02 31 04.0           ~ 90 0
7 ACO 1674 ClG 13 03 56.5 +67 31 04           ~ 45 0
8 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1011 0
9 ACO 1750 ClG 13 30 49.94 -01 52 22.1           ~ 143 1
10 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 204 2
11 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 252 0
12 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 618 1
13 ACO 2050 ClG 15 16 21.6 +00 05 59           ~ 86 0
14 ACO 2065 ClG 15 22 42.6 +27 43 21           ~ 337 0
15 ACO 2631 ClG 23 37 40.7 +00 16 35           ~ 136 0
16 ACO 2670 ClG 23 54 13.64 -10 25 08.7           ~ 332 0

    Equat.    Gal    SGal    Ecl

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2020.02.17-23:46:32

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