3 papers
astro-ph1999
The visible environment of gas-accreting galaxies
D. Bettoni, G. Galletta, F. Prada
We studied the environment of a sample of galaxies in which the presence of polar rings or the presence of gas- and stars- counterrotation is observed. These galaxies are believed…
astro-ph1997
The visible environment of polar ring galaxies
Chiara Brocca, Daniela Bettoni, Giuseppe Galletta
A statistical study of the environment around Polar Ring Galaxies is presented. Two kinds of search are performed: 1) a study of the concentration and diameters of all the objects…
astro-ph1996
Dynamical Models Of S0 And Sa Galaxies
Ezio Pignatelli, Giuseppe Galletta
We present a set of detailed, self-consistent, isotropic dynamical models for disc galaxies. We start from the hypothesis that each galaxy can be decomposed in a bulge, following t…