2010MNRAS.401..433W

Query : 2010MNRAS.401..433W

2010MNRAS.401..433W - Mon. Not. R. Astron. Soc., 401, 433-444 (2010/January-1)

The UV-optical colours of brightest cluster galaxies in optically and X-ray selected clusters.

WANG J., OVERZIER R., KAUFFMANN G., VON DER LINDEN A. and KONG X.

Abstract (from CDS):

Many brightest cluster galaxies (BCGs) at the centres of X-ray selected clusters exhibit clear evidence for recent star formation. However, studies of BCGs in optically selected clusters show that star formation is not enhanced when compared to control samples of non-BCGs of similar stellar mass. Here, we analyse a sample of 113 BCGs in low-redshift (z < 0.1), optically selected clusters, a matched control sample of non-BCGs, and a smaller sample of BCGs in X-ray selected clusters. We convolve the Sloan Digital Sky Survey images of the BCGs to match the resolution of the Galaxy Evolution Explorer (GALEX) data and we measure UV-optical colours in their inner and outer regions. We find that optically selected BCGs exhibit smaller scatter in optical colours and redder inner NUV - r colours than the control galaxies, indicating that they are a homogenous population with very little ongoing star formation. The BCGs in the X-ray selected cluster sample span a similar range in optical colours, but have bluer NUV - r colours. Among X-ray selected BCGs, those located in clusters with central cooling times of less than 1 Gyr are significantly bluer than those located in clusters where the central gas cooling times are long. Our main conclusion is that the location of a galaxy at the centre of its halo is not sufficient to determine whether or not it is currently forming stars. One must also have information about the thermodynamic state of the gas in the core of the halo.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): stars: formation - cooling flow

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
2 ACO 383 ClG 02 48 03.3915 -03 31 45.228           ~ 389 0
3 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
4 ACO 1361 ClG 11 43 45.85 +46 20 51.8           ~ 96 0
5 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 456 0
6 NAME Virgo A Cluster GrG 12 30 49.2 +12 23 30           ~ 154 0
7 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
8 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 325 0
9 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
10 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
11 Z 162-10 LIN 13 48 52.4892734448 +26 35 34.353002688   14.0       ~ 241 2
12 ACO 1991 ClG 14 54 41.53 +18 38 08.4           ~ 349 1
13 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
14 ClG J1504-0248 ClG 15 04 07.4 -02 48 15           ~ 186 0
15 ACO 2065 ClG 15 22 22.7 +27 44 20           ~ 398 0
16 MCG+05-36-022 rG 15 22 28.9069678392 +27 42 44.737810848   17.22       ~ 18 1
17 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 122 0
18 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
19 NAME NGC 6338 Group GrG 17 15 32.47 +57 25 19.0           ~ 95 0
20 ClG J1720+2638 ClG 17 20 09.6 +26 37 35           ~ 284 0
21 ClG J1720+3536 ClG 17 20 16.8 +35 36 27           ~ 150 1
22 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
23 ACO 2409 ClG 22 00 52.7 +20 58 27           ~ 101 0
24 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 364 0

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