2009A&A...508.1141S


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.23CEST13:39:11

2009A&A...508.1141S - Astronomy and Astrophysics, volume 508, 1141-1159 (2009/12-4)

Evolution of the early-type galaxy fraction in clusters since z = 0.8.

SIMARD L., CLOWE D., DESAI V., DALCANTON J.J., VON DER LINDEN A., POGGIANTI B.M., WHITE S.D.M., ARAGON-SALAMANCA A., DE LUCIA G., HALLIDAY C., JABLONKA P., MILVANG-JENSEN B., SAGLIA R.P., PELLO R., RUDNICK G.H. and ZARITSKY D.

Abstract (from CDS):

We study the morphological content of a large sample of high-redshift clusters to determine its dependence on cluster mass and redshift. Quantitative morphologies are based on PSF-convolved, 2D bulge+disk decompositions of cluster and field galaxies on deep Very Large Telescope FORS2 images of eighteen, optically-selected galaxy clusters at 0.45<z<0.80 observed as part of the ESO Distant Cluster Survey (``EDisCS''). Morphological content is characterized by the early-type galaxy fraction fet, and early-type galaxies are objectively selected based on their bulge fraction and image smoothness. This quantitative selection is equivalent to selecting galaxies visually classified as E or S0. Changes in early-type fractions as a function of cluster velocity dispersion, redshift and star-formation activity are studied. A set of 158 clusters extracted from the Sloan Digital Sky Survey is analyzed exactly as the distant EDisCS sample to provide a robust local comparison. We also compare our results to a set of clusters from the Millennium Simulation. Our main results are: (1) the early-type fractions of the SDSS and EDisCS clusters exhibit no clear trend as a function of cluster velocity dispersion. (2) Mid-z EDisCS clusters around σ=500km/s have fet≃0.5 whereas high-z EDisCS clusters have fet≃0.4. This represents a ∼25% increase over a time interval of 2Gyr. (3) There is a marked difference in the morphological content of EDisCS and SDSS clusters. None of the EDisCS clusters have early-type galaxy fractions greater than 0.6 whereas half of the SDSS clusters lie above this value. This difference is seen in clusters of all velocity dispersions. (4) There is a strong and clear correlation between morphology and star formation activity in SDSS and EDisCS clusters in the sense that decreasing fractions of [OII] emitters are tracked by increasing early-type fractions. This correlation holds independent of cluster velocity dispersion and redshift even though the fraction of [OII] emitters decreases from z∼0.8 to z∼0.06 in all environments. Our results pose an interesting challenge to structural transformation and star formation quenching processes that strongly depend on the global cluster environment (e.g., a dense ICM) and suggest that cluster membership may be of lesser importance than other variables in determining galaxy properties.

Abstract Copyright:

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

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME ACO 901-902 Supercluster SCG 09 56 -10.0           ~ 119 1
2 ClG J1018-1211 ClG 10 18 46.45 -12 11 52.8     20.35     ~ 30 0
3 ClG J1037-1243 ClG 10 37 52.6 -12 43 44           ~ 39 0
4 ClG J1040-1155 ClG 10 40 41.6 -11 55 51           ~ 55 0
5 ClG J1054-1146 ClG 10 54 24.2 -11 46 18           ~ 50 0
6 ClG J1054-1245 ClG 10 54 43.5 -12 45 50           ~ 54 0
7 ClG J1059-1253 ClG 10 59 09.5 -12 53 15           ~ 27 0
8 ClG J1103-1244 ClG 11 03 36.5 -12 44 22           ~ 18 0
9 ClG J1119-1129 ClG 11 19 16.5 -11 29 33           ~ 20 0
10 ClG J1122-1136 ClG 11 22 51.7 -11 36 30           ~ 12 0
11 ClG J1138-1133 ClG 11 38 10.3 -11 33 59           ~ 44 0
12 ClG J1202-1224 ClG 12 02 43.1 -12 24 31           ~ 26 0
13 ClG J1216-1201 ClG 12 16 45.10 -12 01 17.3           ~ 66 0
14 ClG J1227-1138 ClG 12 27 53.9 -11 38 20           ~ 45 0
15 ClG J1232-1250 ClG 12 32 30.5 -12 50 33           ~ 48 0
16 ClG J1238-1144 ClG 12 38 33.5 -11 44 28           ~ 14 0
17 ClG J1301-1139 ClG 13 01.7 -11 39           ~ 12 0
18 ClG J1353-1137 ClG 13 53 01.0 -11 37 31           ~ 27 0
19 ClG J1354-1230 ClG 13 54 09.5 -12 30 59           ~ 45 0
20 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 350 0
21 ClG J1411-1148 ClG 14 11 03.9 -11 48 22           ~ 27 0
22 ClG J1420-1236 ClG 14 20 19.4 -12 36 36           ~ 25 0

    Equat.    Gal    SGal    Ecl

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2021.04.23-13:39:11

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