Zobrazeno 1 - 10
of 145
pro vyhledávání: '"Mardirossian, F."'
The dependence of the luminosity function of cluster galaxies on the evolutionary state of the parent cluster is still an open issue, in particular as concern the formation/evolution of the brightest cluster galaxies. We plan to study the bright part
Externí odkaz:
http://arxiv.org/abs/1201.3796
Publikováno v:
Astron.Astrophys.410:461-470,2003
We compare properties of galaxies in loose groups with those in field environment by analyzing the Nearby Optical Galaxy (NOG) catalog of galaxy systems. We consider as group galaxies, objects belonging to systems with at least five members identifie
Externí odkaz:
http://arxiv.org/abs/astro-ph/0308139
Publikováno v:
Astron.Astrophys. 406 (2003) 403-414
We study morphology and luminosity segregation of galaxies in loose groups. We analyze the two catalogs of groups which have been identified in the Nearby Optical Galaxy (NOG) sample, by means of hierarchical and percolation ``friends-of-friends'' me
Externí odkaz:
http://arxiv.org/abs/astro-ph/0305237
Publikováno v:
Astrophys.J.530:62,2000
We analyze a sample of 105 clusters having virial mass homogeneously estimated and for which galaxy magnitudes are available with a well defined high degree of completeness. In particular, we consider a subsample of 89 clusters with B_j band galaxy m
Externí odkaz:
http://arxiv.org/abs/astro-ph/9907266
We evaluate in a homogeneous way the optical masses of 170 nearby clusters (z< 0.15). The sample includes both data from the literature and the new ENACS data (Katgert et al. 1996, 1998). On the assumption that mass follows the galaxy distribution, w
Externí odkaz:
http://arxiv.org/abs/astro-ph/9804187
Publikováno v:
Astrophys.J. 506 (1998) 45
We present a new determination of the mass function of galaxy clusters, based on optical virial mass estimates for a large sample of 152 nearby (z\le0.15) Abell-ACO clusters, as provided by Girardi et al. (1998). This sample includes both data from t
Externí odkaz:
http://arxiv.org/abs/astro-ph/9804188
Publikováno v:
Astrophys.J.490:56,1997
We analyze the internal structures of clusters A1689 and A2218 by applying a recent development of the method of wavelet analysis, which uses the complete information obtained from optical data, i.e. galaxy positions and redshifts. We find that both
Externí odkaz:
http://arxiv.org/abs/astro-ph/9707098
We analyze the presence of substructures in a set of 48 galaxy clusters, by using galaxy positions and redshifts. We use a multi-scale analysis which couples kinematical estimators with the wavelet transform. 14% of our clusters are strongly substruc
Externí odkaz:
http://arxiv.org/abs/astro-ph/9612206