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Astron. Astrophys. 349, 812-818 (1999)

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The intra-cluster medium influence on spiral galaxies

C. Adami 1,2, M. Marcelin 3, P. Amram 3 and D. Russeil 3,4

1 IGRAP, Laboratoire d'Astronomie Spatiale, Traverse du Siphon, F-13012 Marseille, France
2 Dearborn Observatory, 2131 Sheridan, Evanston 60208-2900, USA
3 IGRAP, Observatoire de Marseille, 2 Place Leverrier, F-13248 Marseille Cedex 4, France
4 AAO, Coonabarabran, NSW 2357, Australia

Received 28 January 1999 / Accepted 1 April 1999

Abstract

We made a detailed analysis of the sample of 39 cluster spiral galaxies of various types observed at H[FORMULA] wavelength by Amram et al. (1992 to 1996), with a scanning Fabry-Perot. We plotted the outer gradient of their rotation curves as a function of the deprojected cluster-centric distance. The rotation curves of late type galaxies markedly rise far from the cluster center. This suggests evolutionary effects, since early types show no special trend. We suggest that the evolution process within a cluster leads late type galaxies to exhibit flatter curves when they get closer to the center, on their way to evolving into early type galaxies.

Key words: galaxies: fundamental parameters – galaxies: general – galaxies: interactions – galaxies: kinematics and dynamics – galaxies: spiral

Send offprint requests to: C. Adami

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© European Southern Observatory (ESO) 1999

Online publication: September 13, 1999
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