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For refcode 1995A&AS..110..279S:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1995A&AS..110..279S Optical studies of galaxies in clusters. Observations of spirals in Virgo. III. M. Sperandio, G. Chincarini, R. Rampazzo and R. de Souza Osservatorio Astronomico di Brera, Via Brera 28,1-20121 Milano, Italy Dipartimento di Fisica, Universita di Milano, Via Celoria 16,1-20133 Milano, Italy University of Sao Paulo, 01000 Sao Paulo, Brazil Received June 14; accepted October 21, 1994 Abstract. - We present the analysis of the rotation curves of a sample of 32 spiral galaxies derived from the spectroscopic observations of a sample of 47 galaxies. For 15 galaxies we were either unable to detect emission lines or measure a reasonably good rotation curve. Of the 32 rotation curves 23 are of galaxies member of the Virgo Cluster and 9 selected from the "field". Analysis of mass and density distribution have been obtained. The mass distribution of cluster galaxies belongs to the Type III proposed by Burstein & Rubin (1985) with few exceptions (NGC 4519 Type I, NGC 2280, NGC 4189, NGC 5861, NGC 6070 Type II) and, is unrelated to the morphological type. Density distribution curves from equidensity surface spheroids model, computed for the Virgo sample, result to be primarily composed of three classes. Rotation curves, none of which shows a peculiar trend, have been parametrized using the criteria introduced by Whitmore et al. (1984). The clustercentric distance of Virgo spirals does not correlate neither with OG nor with OGML in agreement with the findings of Distefano et al. (1990) and Amram et al. (1993,1994) for other clusters. Key words: galaxies: spirals - galaxies: kinematics and dynamics clusters of galaxies - Virgo
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