2006A&A...460..381C


Query : 2006A&A...460..381C

2006A&A...460..381C - Astronomy and Astrophysics, volume 460, 381-391 (2006/12-3)

Diffuse light and building history of the galaxy cluster Abell 2667.

COVONE G., ADAMI C., DURRET F., KNEIB J.-P., LIMA NETO G.B. and SLEZAK E.

Abstract (from CDS):

We searched for diffuse intracluster light in the galaxy cluster Abell 2667 (z=0.233) from HST images in three broad band-filters. We applied an iterative multi-scale wavelet analysis and reconstruction technique to these images, which allows to subtract stars and galaxies from the original images. We detect a zone of diffuse emission southwest of the cluster center (DS1) and a second faint object (ComDif) within DS1. Another diffuse source (DS2) may be detected at lower confidence level northeast of the center. These sources of diffuse light contribute to 10-15% of the total visible light in the cluster. Whether they are independent entities or part of the very elliptical external envelope of the central galaxy remains unclear. Deep VLT VIMOS integral field spectroscopy reveals a faint continuum at the positions of DS1 and ComDif but do not allow a redshift to be computed, so we conclude if these sources are part of the central galaxy or not. A hierarchical substructure detection method reveals the presence of several galaxy pairs and groups defining a similar direction to the one drawn by the DS1 - central galaxy - DS2 axis. The analysis of archive XMM-Newton and Chandra observations shows X-ray emission elongated in the same direction. The X-ray temperature map shows the presence of a cool core, a broad cool zone stretching from north to south, and hotter regions towards the northeast, southwest, and northwest. This might suggest shock fronts along these directions produced by infalling material, even if uncertainties remain quite large on the temperature determination far from the center. These various data are consistent with a picture in which diffuse sources are concentrations of tidal debris and harassed matter expelled from infalling galaxies by tidal stripping and undergoing an accretion process onto the central cluster galaxy; as such, they are expected to be found along the main infall directions. Note, however, that the limited signal to noise of the various data and the apparent lack of large numbers of well-defined independent tidal tails, besides the one named ComDif, preclude definitive conclusions on this scenario.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Abell 2667 - X-rays: galaxies: clusters - galaxies: intergalactic medium

Nomenclature: Table 1: [CAD2006] DSN (Nos DS1, DS2), [CAD2006] ComDif N=1.

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4501 2
2 NAME Centaurus A Sy2 13 25 27.6039817176 -43 01 09.493008456   8.18 6.84 6.66   ~ 4230 3
3 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1128 1
4 ACO S 1151 ClG 23 48 17.87 -28 54 19.2           ~ 4 1
5 ACO 4041 ClG 23 48 41.39 -28 46 45.6           ~ 6 1
6 [CAD2006] DS1 ? 23 51 38 -26 05.3           ~ 1 0
7 [CAD2006] ComDif ? 23 51 38.3 -26 05 17           ~ 1 0
8 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 161 0
9 [CAD2006] DS2 ? 23 51 41 -26 04.7           ~ 1 0

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2022.05.22-01:31:54

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