Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236...25r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 1, Sept. 1990, p. 25-32.
Astronomy and Astrophysics
Astrophysics
11
Elliptical Galaxies, Galactic Evolution, Galactic Structure, Interacting Galaxies, Isophotes, Position (Location), Tides, Twisting
Scientific paper
The effects of random collisions in groups or clusters on the development of isophotal twisting (IT) in early-type galaxies are investigated. The maximum ellipticity and IT in each galaxy is estimated on the basis of published observational data and correlated with the galaxy number density. The proportions of S0 and elliptical (E) galaxies with IT are found to be independent of local environmental density. CCD observations of six isolated nonhierarchical pairs containing early-type galaxies, obtained at the Cassegrain focus of the 1.82-m telescope at Asiago Observatory, are then used to study tidal interactions in galaxies with normal morphology; the data are presented in tables and graphs and examined in detail. It is shown that mutual tidal perturbations alone cannot explain the IT phenomena: S0 galaxies are less twisted than Es in all density regimes, and the proportion of twisted Es in E+E pairs is similar to that in the overall sample.
Buson Lucio Maria
Rampazzo Roberto
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