2011MNRAS.410..280J

Query : 2011MNRAS.410..280J

2011MNRAS.410..280J - Mon. Not. R. Astron. Soc., 410, 280-292 (2011/January-1)

The colour–magnitude relation of elliptical and lenticular galaxies in the ESO distant cluster survey.

JAFFE Y.L., ARAGON-SALAMANCA A., DE LUCIA G., JABLONKA P., RUDNICK G., SAGLIA R. and ZARITSKY D.

Abstract (from CDS):

In this paper we study the colour-magnitude relation (CMR) for a sample of 172 morphologically classified elliptical and S0 cluster galaxies from the ESO Distant Cluster Survey (EDisCS) at 0.4 ≲ z ≲ 0.8. The intrinsic colour scatter about the CMR is very small (#963;>= 0.076) in rest-frame U-V. However, there is a small minority of faint early-type galaxies (7 per cent) that are significantly bluer than the CMR. We observe no significant dependence of σint with redshift or cluster velocity dispersion. Because our sample is strictly morphologically selected, this implies that by the time cluster elliptical and S0 galaxies achieve their morphology, the vast majority have already joined the red sequence. The only exception seems to be the very small fraction of faint blue early types. Assuming that the intrinsic colour scatter is due to differences in stellar population ages, we estimate the galaxy formation redshift zFof each cluster and find that zF does not depend on the cluster velocity dispersion. However, zF increases weakly with cluster redshift within the EDisCS sample. This trend becomes very clear when higher redshift clusters from the literature are included. This suggests that, at any given redshift, in order to have a population of fully formed ellipticals and S0s they needed to have formed most of their stars ≃ 2-4 Gyr prior to observation. That does not mean that all early-type galaxies in all clusters formed at these high redshifts. It means that the ones we see already having early-type morphologies also have reasonably old stellar populations. This is partly a manifestation of the `progenitor bias', but also a consequence of the fact that the vast majority of the early-type galaxies in clusters (in particular the massive galaxies) were already red (i.e. already had old stellar populations) by the time they achieved their morphology. Elliptical and S0 galaxies exhibit very similar colour scatter, implying similar stellar population ages. The scarcity of blue S0s indicates that, if they are the descendants of spirals whose star formation has ceased, the parent galaxies were already red when they became S0s. This suggests the red spirals found preferentially in dense environments could be the progenitors of these S0s. We also find that fainter early-type galaxies finished forming their stars later (i.e. have smaller zF), consistent with the cluster red sequence being built over time and the brightest galaxies reaching the red sequence earlier than fainter ones. Combining the CMR scatter analysis with the observed evolution in the CMR zero-point we find that the early-type cluster galaxy population must have had their star formation truncated/stopped over an extended period Δt≳ 1 Gyr.

Abstract Copyright: 2010 The Authors. Journal compilation2010 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: elliptical and lenticular - galaxies: evolution

Simbad objects: 52

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Number of rows : 52
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 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
2 ClG 0055-2754 ClG 00 56 56.8 -27 40 29   21.9       ~ 86 0
3 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 262 3
4 ClG 0412-65 ClG 04 12 51.7 -65 50 17           ~ 45 0
5 ClG J0848+4453 ClG 08 48 34.800 +44 53 41.90           ~ 124 1
6 ClG J0849+4452 ClG 08 48 58.8 +44 51 53           ~ 107 1
7 ClG J0910+5422 ClG 09 10 44.9 +54 22 09           ~ 94 0
8 [MNH2008] cl J1037.9-1243a ClG 10 37.9 -12 43           ~ 10 0
9 EDCS J1037552-1246368 GiC 10 37 55.22 -12 46 36.8         20.816 ~ 7 0
10 EDCS J1037564-1245134 GiC 10 37 56.40 -12 45 13.4         22.367 ~ 2 0
11 EDCS J1040346-1157566 GiC 10 40 34.65 -11 57 56.6         21.048 ~ 6 0
12 EDCS J1040407-1156015 GiC 10 40 40.65 -11 56 01.5         21.109 ~ 7 0
13 ClG J1040-1155 ClG 10 40 41.6 -11 55 51           ~ 57 0
14 EDCS J1054199-1146065 GiC 10 54 19.94 -11 46 06.5         22.433 ~ 2 0
15 EDCS J1054207-1148130 GiC 10 54 20.69 -11 48 13.0         22.866 ~ 4 0
16 ClG J1054-1146 ClG 10 54 24.2 -11 46 18           ~ 54 0
17 NAME ClG J1054-1245A ClG 10 54 43.5 -12 45 50           ~ 3 0
18 ClG J1054-1245 ClG 10 54 43.5 -12 45 50           ~ 55 0
19 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 458 0
20 ClG J1103-1246 ClG 11 03 34.9 -12 46 46           ~ 21 0
21 EDCS J1138034-1133049 GiC 11 38 03.43 -11 33 04.9         22.349 ~ 2 0
22 EDCS J1138050-1132546 GiC 11 38 05.04 -11 32 54.6         22.030 ~ 2 0
23 EDCS J1138068-1132510 GiC 11 38 06.84 -11 32 51.0         21.677 ~ 2 0
24 EDCS J1138096-1135223 GiC 11 38 09.58 -11 35 22.3         21.369 ~ 3 0
25 ClG J1138-1133 ClG 11 38 10.3 -11 33 59           ~ 46 0
26 EDCS J1138107-1133431 GiC 11 38 10.73 -11 33 43.1         20.651 ~ 7 0
27 [MNH2008] cl J1138.2-1133a ClG 11 38.2 -11 33           ~ 13 0
28 EDCS J1138127-1134190 GiC 11 38 12.73 -11 34 19.0         22.797 ~ 3 0
29 EDCS J1138135-1137137 GiC 11 38 13.53 -11 37 13.7         21.999 ~ 2 0
30 EDCS J1216364-1200087 GiC 12 16 36.41 -12 00 08.7         21.645 ~ 6 0
31 EDCS J1216401-1202352 GiC 12 16 40.05 -12 02 35.2         21.120 ~ 7 0
32 EDCS J1216418-1200449 GiC 12 16 41.75 -12 00 44.9         21.658 ~ 8 0
33 ClG J1216-1201 ClG 12 16 45.10 -12 01 17.3           ~ 71 0
34 EDCS J1216461-1201143 GiC 12 16 46.10 -12 01 14.3         20.606 ~ 8 0
35 EDCS J1216462-1200073 GiC 12 16 46.23 -12 00 07.3         22.062 ~ 8 0
36 ClG J1227-1138 ClG 12 27 53.9 -11 38 20           ~ 47 0
37 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
38 EDCS J1232304-1250391 GiC 12 32 30.42 -12 50 39.1         21.073 ~ 2 0
39 ClG J1232-1250 ClG 12 32 30.5 -12 50 33           ~ 51 0
40 EDCS J1232307-1249573 GiC 12 32 30.67 -12 49 57.6         21.790 ~ 3 0
41 EDCS J1232336-1252103 GiC 12 32 33.64 -12 52 10.3         21.486 ~ 2 0
42 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 158 0
43 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
44 EDCS J1354022-1234283 GiC 13 54 02.24 -12 34 28.3         22.603 ~ 4 0
45 EDCS J1354073-1233336 GiC 13 54 07.26 -12 33 33.6         22.786 ~ 4 0
46 ClG J1354-1230 ClG 13 54 09.5 -12 30 59           ~ 47 0
47 [MNH2008] cl J1354.2-1230a ClG 13 54.2 -12 30           ~ 9 0
48 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
49 ClG 1603+4313 ClG 16 04 23.7 +43 04 52           ~ 134 1
50 ClG 1602.9+4329 ClG 16 04 35.3 +43 21 02           ~ 50 1
51 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 106 0
52 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 151 0

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