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Date and Time of the Query: 2019-08-22 T12:11:46 PDT
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For refcode 2001A&A...374...83B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2001A&A...374...83B The visible environment of galaxies with counterrotation D. Bettoni, G. Galletta and F. Prada Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy Dipartimento di Astronomia, Universita di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy Centro Astronomico Hispano-Aleman, Apartado 511, 04080 Almeria, Spain Received 6 February 2001/Accepted 23 April 2001 Abstract. In this paper we present a statistical study of the environments of 49 galaxies in which there is gas- or stellar-counterrotation. The number of possible companions in the field (to apparent magnitude 22), their size and concentration were considered. All the statistical parameters were analysed by means of Kolgomorov-Smirnov tests, using a control sample of 43 galaxies without counterrotation. From our data, no significant differences between the counter-rotating and control samples appear. This is different to Seyfert or radio-loud galaxies which lie in environments with a higher density of companions. On the contrary, if a weak tendency exists, for galaxies with gas counterrotation only, it is discovered in regions of space where the large scale density of galaxies is smaller. Our results tend to disprove the hypothesis that counterrotation and polar rings derive from a recent interaction with a small satellite or a galaxy of similar size. To a first approximation, they seem to follow the idea that all galaxies are born through a merger process of smaller objects occurring very early in their life, or that they derive from a continuous, non-traumatic infall of gas that formed stars later. Whatever the special machinery is which produces counterrotation or polar rings instead of a co-planar, co-rotating distribution of gas and stars, it seems not to be connected to the present galaxy density of their environments. Key words: galaxies: evolution - galaxies: formation - galaxies: interactions - galaxies: peculiar.
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