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2007MNRAS.376..125S - Mon. Not. R. Astron. Soc., 376, 125-150 (2007/March-3)
Morphologies and stellar populations of galaxies in the core of Abell 2218.
SANCHEZ S.F., CARDIEL N., VERHEIJEN M.A.W., PEDRAZ S. and COVONE G.
Abstract (from CDS):
The morphologically segregated colour-magnitude diagram shows that the early-type galaxies cover the range of brighter and redder colours (the so-called `red sequence'). A large fraction of spiral galaxies (∼50 per cent) is found, most of them fainter than the limit of previous studies. They cover a wide range in colours, from blue colours typical of Butcher-Oemler galaxies to red colours similar to those of early-type galaxies. This result indicates that early-type galaxies are more massive and have older stellar populations, while late-type galaxies are less massive and have a wider range of stellar populations. The distribution of luminosity-weighted ages as a function of metallicities and luminosity-weighted masses, and the distribution of Sérsic indices as a function of the luminosity-weighted masses confirm these results. They in fact agree with a proposed two-step scenario for the evolution of galaxies in clusters, where the star formation is quenched first in the infalling spirals, after which a morphological transformation follows that requires larger time-scales. This scenario naturally explains the population faint late-type galaxies with old stellar populations observed in this cluster. In addition, an extremely blue merging galaxy system is found at the core, with the nominal redshift of the cluster.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): techniques: spectroscopic - galaxies: clusters: individual: Abell 2218 - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: spiral - galaxies: stellar content
VizieR on-line data: <Available at CDS (J/MNRAS/376/125): table1.dat table2.dat table3.dat table4.dat>
Nomenclature: Table 2: [SCV2007] NNN N=56 among (Nos 1-798). Fig.5, Table 4: [SCV2007] IFU NN (Nos 1-41).
Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.
Simbad objects: 6
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