136 citations · 431 across the 6 of their papers we have counts for
6 papers
Substructures in WINGS clusters
M. Ramella, A. Biviano, A. Pisani +10
We search for and characterize substructures in the projected distribution of galaxies observed in the wide field CCD images of the 77 nearby clusters of the WIde-field Nearby Gala…
The mass function and distribution of velocity dispersions for UZC groups of galaxies
Armando Pisani, Massimo Ramella, Margaret J. Geller
We measure the distribution of velocity dispersions of groups of galaxies identified in the UZC catalog; we use the distribution to derive the group mass function. We introduce a n…
The UZC-SSRS2 Group Catalog
Massimo Ramella, Margaret J. Geller, Armando Pisani +1
We apply a friends-of-friends algorithm to the combined UZC and SSRS2 redshift surveys to construct a catalog of 1168 groups of galaxies; 411 of these groups have 5 or more members…
The ESO Slice Project (ESP) galaxy redshift survey: VI Groups of Galaxies
M. Ramella, G. Zamorani, E. Zucca +17
In this paper we identify objectively and analyze groups of galaxies in the recently completed ESP survey. We find 231 groups above the number overdensity threshold delta(rho)/rho=…
A substructure analysis of the A3558 cluster complex
S. Bardelli, A. Pisani, M. Ramella +2
The "algorithm driven by the density estimate for the identification of clusters" (DEDICA, Pisani 1993, 1996) is applied to the A3558 cluster complex in order to find substructures…
A non-parametric and scale-independent method for cluster analysis II: the multivariate case
Armando Pisani
A general method is described for detecting and analysing galaxy systems. The multivariate geometrical structure of the sample is studied by using an extension of the method which…