1999ApJ...516..647A

Query : 1999ApJ...516..647A

1999ApJ...516..647A - Astrophys. J., 516, 647-659 (1999/May-2)

Is the Butcher-Oemler effect a function of the cluster redshift?.

ANDREON S. and ETTORI S.

Abstract (from CDS):

Using PSPC ROSAT data, we measure the X-ray surface brightness profiles, size, and luminosity of the Butcher-Oemler (BO) sample of clusters of galaxies. The cluster X-ray size, as measured by the Petrosian rη=2 radius, does not change with redshift and is independent of X-ray luminosity. On the other hand, the X-ray luminosity increases with redshift. Considering that fair samples show no evolution, or negative luminosity evolution, we conclude that the BO sample is not formed from the same class of objects observed at different look-back times. This is in conflict with the usual interpretation of the Butcher-Oemler as an evolutionary (or redshift dependent) effect, based on the assumption that we are comparing the same class of objects at different redshifts. Other trends present in the BO sample reflect selection criteria rather than differences in look-back time, as independently confirmed by the fact that trends lose strength when we enlarge the sample with an X-ray-selected sample of clusters. The variety of optical sizes and shapes of the clusters in the Butcher-Oemler sample and the Malmquist-like bias are the reasons for these selection effects that mimic the trends usually interpreted as changes due to evolution.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Evolution - Galaxies: Photometry - X-Rays: Galaxies

CDS comments: table 1 : Cl 0004.8-34 = ClG 0004.8-3450

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 ZwCl 0004-3450 ClG 00 07.3 -34 33           ~ 13 0
2 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
3 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 648 1
4 ACO 222 ClG 01 37 31.1 -12 59 30           ~ 153 1
5 ACO 223 ClG 01 37 55.9 -12 49 11           ~ 135 1
6 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 727 1
7 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 825 0
8 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 408 3
9 3C 75 PaG 02 57 41.64 +06 01 28.0           ~ 312 1
10 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
11 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
12 ACO 777 ClG 09 27 27.1 +78 15 29           ~ 29 0
13 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
14 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
15 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
16 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
17 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
18 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
19 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
20 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4
21 ACO 1904 ClG 14 22 13.21 +48 35 59.7           ~ 144 0
22 ACO 1942 ClG 14 38 21.8673 +03 40 13.247           ~ 122 0
23 ACO 1961 ClG 14 44 31.7 +31 13 36           ~ 54 0
24 ACO 1963 ClG 14 44 57.0 +31 30 26           ~ 22 0
25 ZwCl 1447+2619 ClG 14 49 28.2 +26 07 57           ~ 54 0
26 ACO 2111 ClG 15 39 40.9 +34 25 04           ~ 188 0
27 ACO 2125 ClG 15 41 14.1 +66 15 57           ~ 124 1
28 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
29 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
30 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
31 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
32 ACO 2397 ClG 21 56 08.50 +01 23 27.3           ~ 59 0
33 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 515 2
34 ACO 2645 ClG 23 41 17.0 -09 01 11           ~ 98 0
35 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 364 0

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