2008A&A...483..727P


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST00:59:37

2008A&A...483..727P - Astronomy and Astrophysics, volume 483, 727-739 (2008/6-1)

Diffuse stellar emission in X-ray luminous galaxy clusters at z ∼ 0.3. I. Is the diffuse optical light boosted and rejuvenated in merging clusters?

PIERINI D., ZIBETTI S., BRAGLIA F., BOEHRINGER H., FINOGUENOV A., LYNAM P.D. and ZHANG Y.-Y.

Abstract (from CDS):

Clusters of galaxies host a diffuse population of intergalactic stars. Diffuse optical light is observed in clusters up to redshift z∼0.4. Recent cosmological hydrodynamical simulations show that this intracluster light originates nearly in parallel with the build-up of the brightest cluster galaxy (BCG), as identified at z=0. However, theory proposes alternative scenarios for its origin. We searched for diffuse stellar emission around BCGs in three of the most X-ray luminous clusters found at z∼0.3 in the REFLEX cluster survey and observed with XMM-Newton. These systems (RXCJ0014.3-3022, RXCJ0232.2-4420, and RXCJ2308.3-0211) are in different dynamical states, as witnessed by their X-ray morphology and optical appearence (e.g. multiplicity of BCGs). Existing medium-deep, wide-field imaging in B and R bands allows extension, intensity, and colour of the stellar emission to be determined across a region that encompasses the X-ray emission from the intracluster medium (ICM) in each cluster. Diffuse stellar emission is robustly detected down to a surface brightness of 26R-mag/arcsec2 (observed frame) around a total of seven BCGs, extending up to galactocentric distances of ∼100h70–1kpc. In particular, it surrounds a pair of BCGs in RXCJ0232.2-4420, while it bridges two BCGs associated with the minor subcomponent of the merging cluster RXCJ0014.3-3022. The diffuse light detected at the greatest distances from the BCGs of the rather regular clusters RXCJ0232.2-4420 and RXCJ2308.3-0211 follows the ICM distribution. Its B-R colour is consistent with the colours measured within the BCG effective radii. The diffuse light around the two pairs of BCGs in RXCJ0014.3-3022 exhibits bluer colours than the BCG central regions by up to 0.5mag. If the contribution of the intracluster light (ICL) to the detected diffuse light around BCGs is not negligible, ICL and BCGs have similar stellar populations in relatively relaxed clusters. Merging on a cluster scale eventually adds gravitational stresses to BCGs and other galaxies in subcluster cores. This event may affect the properties of the diffuse stellar emission around BCGs. Shredding of star-forming, low-metallicity dwarf galaxies is favoured as the cause of the bluer B-R colours of the diffuse stellar component around the two pairs of BCGs in the merging cluster RXCJ0014.3-3022.

Abstract Copyright:

Journal keyword(s): X-rays: galaxies: clusters - galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: interactions - diffuse radiation

Nomenclature: Table 2: [PZB2008] RXC J0014.3-3022WW A N=4, [PZB2008] RXC J0032.2-4420 A N=2, [PZB2008] RXC J2308.3-0211 N=1.

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 - 2019
#notes
1 [BML2002] 681 GiC 00 14 09.940 -30 22 20.50     19.589     ~ 4 1
2 [BGS2006] 4 GiC 00 14 12.970 -30 22 34.80     19.578     ~ 7 1
3 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 537 0
4 2dFGRS TGS361Z173 BiC 00 14 20.704 -30 24 00.66   21.2572 18.1736 17.460 17.1432 ~ 15 1
5 [ORN2011] 003.592042-30.405417 BiC 00 14 22.091 -30 24 20.69   21.0939 18.0175 17.93 17.1015 ~ 15 1
6 [PZB2008] RXC J0232.2-4420 B GiC 02 32 16.364 -44 20 47.95           ~ 2 1
7 [PZB2008] RXC J0232.2-4420 A GiC 02 32 18.522 -44 20 47.81           ~ 2 1
8 2MAXI J0231-440 ClG 02 32 18.69 -44 20 41.5           ~ 75 0
9 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 774 1
10 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 447 0
11 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5645 0
12 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4096 2
13 ACO 3888 ClG 22 34 23.0 -37 43 29           ~ 121 1
14 ACO S 1077 ClG 22 58 52.34 -34 46 54.6           ~ 177 0
15 2MASX J23082221-0211315 BiC 23 08 22.214 -02 11 31.52           ~ 9 1
16 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 100 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-00:59:37

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