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Barred Spirals, Double Galaxies and massive Halos 1
Author(s) -
Bergh Sidney Van Den
Publication year - 1979
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.19793000502
Subject(s) - physics , astrophysics , galaxy , halo , binary number , universe , cluster (spacecraft) , galaxy cluster , astronomy , arithmetic , mathematics , computer science , programming language
It is shown that there is no significant dependence of the frequency with which barred spirals occur on environment. Therefore, the difference between normal and barred spirals must be largely due to initial conditions. The excess of early type galaxie (in particular ellipticals and SO's) among the statistically selected binary samples is probably caused by a contamination by cluster members and will therefore result in a systematic overestimate of the masses of binary galaxies. The large fraction of multiple first‐ranked galaxies found in rich clusters of B AUTZ ‐M ORGAN type I is surprising in view of tidal effects and dynamical friction, which should lead to the destruction of such massive binary systems on a time scale much shorter than the age of the Universe.