C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET05:44:39

2011MNRAS.413.1036H - Mon. Not. R. Astron. Soc., 413, 1036-1053 (2011/May-2)

The stellar populations of early-type galaxies – II. The effects of environment and mass.


Abstract (from CDS):

The degree of influence that the environment and mass have on the stellar populations of early-type galaxies is uncertain. In this paper, we present the results of a spectroscopic analysis of the stellar populations of early-type galaxies aimed at addressing this question. The sample of galaxies is drawn from four clusters, with <z>= 0.04, and their surrounding structure extending to ∼10Rvir. We find that the distributions of the absorption-line strengths and the stellar population parameters, age, metallicity and α-element abundance ratio, do not differ significantly between the clusters and their outskirts, but the tight correlations found between these quantities and the velocity dispersion within the clusters are weaker in their outskirts. All three stellar population parameters of cluster galaxies are positively correlated with the velocity dispersion. Galaxies in clusters form a homogeneous class of objects that have similar distributions of line-strengths and stellar population parameters, and follow similar scaling relations, regardless of the cluster richness or morphology. We estimate the intrinsic scatter of the Gaussian distribution of metallicities to be 0.3 dex, while that of the α-element abundance ratio is 0.07 dex. The e-folding time of the exponential distribution of galaxy ages is estimated to be 900 Myr. The intrinsic scatters of the metallicity and α-element abundance ratio distributions can almost entirely be accounted for by the correlations with the velocity dispersion and the intrinsic scatter about these relations. This implies that the galaxy mass plays a major role in determining its stellar population.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: formation - galaxies: stellar content

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1503 0
2 ACO 930 ClG 10 07 01.32 -05 37 28.7           ~ 30 0
3 ACO 1139 ClG 10 58 10.98 +01 36 16.4           ~ 149 3
4 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4134 2
5 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 483 0
6 ACO 3558 ClG 13 27 54.8 -31 29 32           ~ 403 2

    Equat.    Gal    SGal    Ecl

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