2010MNRAS.406..368U

Query : 2010MNRAS.406..368U

2010MNRAS.406..368U - Mon. Not. R. Astron. Soc., 406, 368-381 (2010/July-3)

An environmental Butcher-Oemler effect in intermediate-redshift X-ray clusters.

URQUHART S.A., WILLIS J.P., HOEKSTRA H. and PIERRE M.

Abstract (from CDS):

We present uniform Canada-France-Hawaii Telescope (CFHT) Megacam g and r photometry for 34 X-ray-selected galaxy clusters drawn from the X-ray Multi-Mirror (XMM) Large Scale Structure (LSS) survey and the Canadian Cluster Comparison Project (CCCP). The clusters possess well-determined X-ray temperatures spanning the range 1 < kT(keV) < 12. In addition, the clusters occupy a relatively narrow redshift interval (0.15 < z < 0.41) in order to minimize any redshift-dependent photometric effects. We investigate the colour bimodality of the cluster galaxy populations and compute blue fractions using criteria derived by Butcher & Oemler. We identify a trend to observe increasing blue fraction versus redshift in common with numerous previous studies of cluster galaxy populations. However, in addition we identify an environmental dependence of cluster blue fraction in that cool (low-mass) clusters display higher blue fractions than hotter (higher mass) clusters. Finally, we tentatively identify a small excess population of extremely blue galaxies in the coolest X-ray clusters (essentially massive groups) and note that these may be the signature of actively starbursting galaxies driven by galaxy-galaxy interactions in the group environment.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): galaxies: clusters: general

Simbad objects: 35

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Number of rows : 35
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 115 ClG 00 55 59 +26 23.2           ~ 295 1
2 ACO 223 ClG 01 37 55.9 -12 49 11           ~ 135 1
3 RzCS 031 ClG 02 20 45.46 -03 25 59.7           ~ 26 0
4 XCLASS 169 ClG 02 22 05.6 -04 32 47           ~ 25 0
5 HSCS J022402-050527 ClG 02 24 00.6 -05 05 25           ~ 29 0
6 CXOU J022428.2-041529 ClG 02 24 33.8 -04 14 15           ~ 36 0
7 RzCS 774 ClG 02 25 20.2 -03 48 30           ~ 18 0
8 HSCS J022525-044045 ClG 02 25 24.6 -04 40 45       17.3   ~ 43 0
9 XCLASS 39 ClG 02 25 59.5 -02 49 35           ~ 12 0
10 RzCS 768 ClG 02 27 22.39 -03 21 39.2           ~ 30 0
11 HSCS J022725-043237 ClG 02 27 25.9 -04 32 15           ~ 35 0
12 RzCS 180 ClG 02 27 40.3 -04 51 31           ~ 33 0
13 RzCS 185 ClG 02 28 03.4 -04 51 03           ~ 29 0
14 ClG 0440+02 ClG 04 43 09.7 +02 10 19     17.03     ~ 129 0
15 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
16 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
17 ACO 586 ClG 07 32 20.3 +31 37 58           ~ 196 0
18 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
19 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
20 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
21 ClG 1008-12 ClG 10 10 34.1 -12 39 48     18.0     ~ 155 0
22 ACO 959 ClG 10 17 35.0 +59 33 28           ~ 76 0
23 ACO 1246 ClG 11 23 57.4 +21 29 14           ~ 118 0
24 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
25 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
26 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
27 ACO 1942 ClG 14 38 21.8673 +03 40 13.247           ~ 122 0
28 ACO 2111 ClG 15 39 40.9 +34 25 04           ~ 188 0
29 ACO 2104 ClG 15 40 06.8 -03 17 39           ~ 113 0
30 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
31 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
32 ACO 2259 ClG 17 20 09.2 +27 40 09           ~ 131 0
33 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
34 CIZA J1938.3+5409 ClG 19 38 18.6 +54 09 33           ~ 42 0
35 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 152 0

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