INVESTIGADORES
MURIEL Hernan
artículos
Título:
Properties of groups of galaxies in the vicinity of massive clusters
Autor/es:
RAGONE, C. J.; MERCHÁN, M.; MURIEL, H.; ZANDIVAREZ, A.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
Royal Astronomical Society
Referencias:
Lugar: London; Año: 2004 vol. 350 p. 983 - 988
ISSN:
0035-8711
Resumen:
This work analyses the properties of groups of galaxies in the vicinity
of clusters. On the basis of a very large public Virgo Consortium
Simulation, we identified systems of galaxies in a wide range of masses.
Systems with masses greater than Mcut= 4 ×
1014 Msolarh-1 are considered `hosts',
whereas smaller systems are taken as groups. Our results show that group
properties are affected by the proximity of massive hosts. Physical
properties such as velocity dispersion, internal energy (E) and virial
radius, show an increment, whereas the mean density decreases as the
host-group distance decreases. By analysing groups with different
properties, we find that the low mass and the weakly bound (E > 0)
subsamples are strongly affected by the presence of the host; on the
other hand, massive groups and groups with E < 0 do not show
dependence on the host-group distance. Using a sample of groups
identified in the final version of the 2dF Galaxy Redshift Survey, we
find a very similar velocity dispersion behaviour in the observational
data compared to results in the simulation. We also study the dependence
of the group velocity dispersion on the host masses in both observations
and simulation, and we find that the larger the host mass, the higher
the effect on its vicinity.