Bibcode
Agulli, I.; Aguerri, J. A. L.; Diaferio, A.; Dominguez-Palmero, L. ; Sánchez-Janssen, R.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 467, Issue 4, p.4410-4423
Fecha de publicación:
6
2017
Número de citas
16
Número de citas referidas
16
Descripción
We carried out the deep spectroscopic observations of the nearby cluster
A 2151 with AF2/WYFFOS@WHT. The caustic technique enables us to identify
360 members brighter than Mr = -16 and within
1.3R200. We separated the members into subsamples according
to photometrical and dynamical properties such as colour, local
environment and infall time. The completeness of the catalogue and our
large sample allow us to analyse the velocity dispersion and the
luminosity functions (LFs) of the identified populations. We found
evidence of a cluster still in its collapsing phase. The LF of the red
population of A 2151 shows a deficit of dwarf red galaxies. Moreover,
the normalized LFs of the red and blue populations of A 2151 are
comparable to the red and blue LFs of the field, even if the blue
galaxies start dominating 1 mag fainter and the red LF is well
represented by a single Schechter function rather than a double
Schechter function. We discuss how the evolution of cluster galaxies
depends on their mass: bright and intermediate galaxies are mainly
affected by dynamical friction and internal/mass quenching, while the
evolution of dwarfs is driven by environmental processes that need time
and a hostile cluster environment to remove the gas reservoirs and halt
the star formation.
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