Issue |
A&A
Volume 424, Number 1, September II 2004
|
|
---|---|---|
Page(s) | 79 - 90 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20040324 | |
Published online | 17 August 2004 |
Transformations of galaxies in the environments of the
cluster ABCG 209 at z
0.2
*,**
1
INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy e-mail: mercurio@na.astro.it
2
Dipartimento di Astronomia, Università degli Studi di Trieste, via Tiepolo 11, 34100 Trieste, Italy
Received:
24
February
2004
Accepted:
16
May
2004
We analyse the properties of galaxy populations in the rich
Abell cluster ABCG 209 at redshift 0.21, on the basis of
spectral classification of 102 member galaxies. We take advantage of
available structural parameters to study separately the properties of
bulge-dominated and disk-dominated galaxies. The star formation
histories of the cluster galaxy populations are investigated by using
line strengths and the 4000 Å break, through a comparison to
stellar population synthesis models. The dynamical properties of
different spectral classes are examined in order to infer the past
merging history of ABCG 209. The cluster is characterized by the
presence of two components: an old galaxy population, formed very
early (
3.5), and a younger (
1.2)
population of infalling galaxies. We find evidence of a merger with an
infalling group of galaxies occurred 3.5–4.5 Gyr ago. The correlation
between the position of the young H
-strong galaxies and the
X-ray flux shows that the hot intracluster medium triggered a
starburst in this galaxy population ~3 Gyr ago.
Key words: Galaxy: evolution / Galaxy: fundamental parameters / galaxies: stellar content / galaxies: clusters: individual: ABCG 209
© ESO, 2004
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