2009MNRAS.400...68D

Query : 2009MNRAS.400...68D

2009MNRAS.400...68D - Mon. Not. R. Astron. Soc., 400, 68-77 (2009/November-3)

On the role of the post-starburst phase in the buildup of the red sequence of intermediate-redshift clusters.

DE LUCIA G., POGGIANTI B.M., HALLIDAY C., MILVANG-JENSEN B., NOLL S., SMAIL I. and ZARITSKY D.

Abstract (from CDS):

We present new deep spectroscopic observations of 0.05-0.5 L* galaxies in one cluster (cl1232.5-1250) drawn from the ESO (European Southern Observatory) Distant Cluster Survey (EDisCS) sample, at z = 0.54. The new data extend the spectroscopy already available for this cluster by about 1 mag. The cluster has a large fraction of passive galaxies and exhibits a well-defined and relatively tight colour-magnitude relation. Among spectroscopic members, only six galaxies are classified as `post-starburst' (k+a). For another EDisCS cluster at similar redshift and with as deep spectroscopy, no member is found to have a k+a spectrum. The low measured numbers of post-starburst systems appear to be inadequate to explain the observed increase of faint red galaxies at lower redshift, even when accounting for the infall of new galaxies on to the cluster. Post-starburst galaxies represent a possible channel to move galaxies from the blue star-forming cloud to the red sequence, but the available data suggest this is not the dominant channel in galaxy clusters. If the galaxies at the faint end of the red sequence in nearby clusters originate from the blue galaxies observed in distant galaxy clusters, the transformation must have occurred primarily through physical processes that do not lead to a post-starburst phase. In addition, our data exclude a large population of k+a galaxies at faint magnitudes, as found in the Coma cluster.

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

Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: fundamental parameters

Simbad objects: 34

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Number of rows : 34
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 J1138-1133 ClG 11 38 10.3 -11 33 59           ~ 46 0
2 EDCS J1232212-1251476 G 12 32 21.160 -12 51 47.61           ~ 1 0
3 EDCS J1232230-1253041 G 12 32 22.970 -12 53 04.07           ~ 1 0
4 EDCS J1232242-1252301 GiC 12 32 24.24 -12 52 30.1         21.992 ~ 3 0
5 EDCS J1232261-1253040 G 12 32 26.080 -12 53 04.00           ~ 1 0
6 EDCS J1232261-1252429 GiC 12 32 26.11 -12 52 42.9         21.482 ~ 2 0
7 EDCS J1232274-1250548 G 12 32 27.430 -12 50 54.78           ~ 1 0
8 EDCS J1232276-1250017 G 12 32 27.610 -12 50 01.69           ~ 1 0
9 EDCS J1232284-1251573 G 12 32 28.360 -12 51 57.26           ~ 1 0
10 EDCS J1232285-1250527 G 12 32 28.530 -12 50 52.74           ~ 1 0
11 EDCS J1232291-1251054 G 12 32 29.080 -12 51 05.40           ~ 1 0
12 EDCS J1232292-1249417 G 12 32 29.170 -12 49 41.70           ~ 1 0
13 EDCS J1232299-1250018 G 12 32 29.940 -12 50 01.84           ~ 1 0
14 EDCS J1232300-1251293 G 12 32 29.970 -12 51 29.30           ~ 1 0
15 ClG J1232-1250 ClG 12 32 30.5 -12 50 33           ~ 51 0
16 EDCS J1232311-1251563 G 12 32 31.070 -12 51 56.32           ~ 1 0
17 EDCS J1232311-1249392 G 12 32 31.110 -12 49 39.16           ~ 1 0
18 EDCS J1232319-1250024 G 12 32 31.910 -12 50 02.44           ~ 1 0
19 EDCS J1232320-1252551 G 12 32 31.970 -12 52 55.15           ~ 1 0
20 EDCS J1232320-1251257 G 12 32 32.040 -12 51 25.72           ~ 1 0
21 EDCS J1232324-1253496 G 12 32 32.440 -12 53 49.57           ~ 1 0
22 EDCS J1232333-1252436 G 12 32 33.320 -12 52 43.56           ~ 1 0
23 EDCS J1232335-1249293 G 12 32 33.540 -12 49 29.29           ~ 1 0
24 EDCS J1232339-1250359 G 12 32 33.890 -12 50 35.93           ~ 1 0
25 EDCS J1232342-1248565 G 12 32 34.18 -12 48 56.7           ~ 2 0
26 EDCS J1232348-1248427 G 12 32 34.760 -12 48 42.73           ~ 1 0
27 EDCS J1232350-1249519 G 12 32 34.980 -12 49 51.91           ~ 1 0
28 EDCS J1232358-1249348 G 12 32 35.800 -12 49 34.77           ~ 1 0
29 EDCS J1232361-1254185 GiC 12 32 36.10 -12 54 18.5         19.741 ~ 3 0
30 EDCS J1232366-1250526 G 12 32 36.610 -12 50 52.63           ~ 1 0
31 EDCS J1232366-1248446 G 12 32 36.610 -12 48 44.62           ~ 1 0
32 EDCS J1232369-1248246 G 12 32 36.880 -12 48 24.58           ~ 1 0
33 EDCS J1232370-1248239 GiC 12 32 37.04 -12 48 23.9         20.577 ~ 6 0
34 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2

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