Bibcode
Aguerri, J. A. L.; Girardi, M.; Boschin, W.; Barrena, R.; Méndez-Abreu, J.; Sánchez-Janssen, R.; Borgani, S.; Castro-Rodríguez, N.; Corsini, E. M.; Del Burgo, C.; D'Onghia, E.; Iglesias-Páramo, J.; Napolitano, N.; Vilchez, J. M.
Bibliographical reference
Astronomy and Astrophysics, Volume 527, id.A143
Advertised on:
3
2011
Journal
Citations
41
Refereed citations
40
Description
Context. The most accepted scenario for the origin of fossil groups is
that they are galaxy associations in which the merging rate was fast and
efficient. These systems have assembled half of their mass at early
epoch of the Universe, subsequently growing by minor mergers, and
therefore could contain a fossil record of the galaxy structure
formation. Aims: We have started an observational project in
order to characterize a large sample of fossil groups. In this paper we
present the analysis of the fossil system RX J105453.3+552102.
Methods: Optical deep images were used for studying the properties of
the brightest group galaxy and for computing the photometric luminosity
function of the group. We have also performed a detail dynamical
analysis of the system based on redshift data for 116 galaxies.
Combining galaxy velocities and positions we selected 78 group members.
Results: RX J105453.3+552102 is located at ⟨z⟩ = 0.47,
and shows a quite large line-of-sight velocity dispersion
σv 1000 km s-1. Assuming the dynamical
equilibrium, we estimated a virial mass of M( galaxies since its
initial collapse.
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