EDP Sciences
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Volume 369, Number 2, April II 2001
Page(s) 432 - 440
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20010116

A&A 369, 432-440 (2001)
DOI: 10.1051/0004-6361:20010116

HI deficiency in the galaxy cluster ACO 3627

ATCA observations in the Great Attractor region
B. Vollmer1, 2, 3, V. Cayatte1, W. van Driel1, 4, P. A. Henning5, R. C. Kraan-Korteweg1, 6, C. Balkowski1, P. A. Woudt7, 8 and W. J. Duschl2, 3

1  Observatoire de Paris, DAEC, UMR 8631, CNRS et Université Paris 7, 92195 Meudon Cedex, France
2  Institut für Theoretische Astrophysik der Universität Heidelberg, Tiergartenstraße 15, 69121 Heidelberg, Germany
3  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
4  Unité Scientifique Nançay, CNRS USR 704B, Observatoire de Paris, 92195 Meudon Cedex, France
5  Institute for Astrophysics, University of New Mexico, 800 Yale Boulevard, NE, Albuquerque, NM 87131, USA
6  Departamento de Astronomía, Universidad de Guanajuato, Apdo. Postal 144, Guanajuato, Gto. 36000, Mexico
7  Department of Astronomy, University of Cape Town, Rondebosch, 7700 South Africa
8  European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany

(Received 19 September 2000 / Accepted 12 January 2001)

ATCA 21 cm HI observations of the rich galaxy cluster ACO 3627 in the Great Attractor region are presented. Three fields of 30' diameter located within one Abell radius of ACO 3627 were observed with a resolution of 15'' and an rms noise of ~1 mJy/beam. Only two galaxies were detected in these fields. We compare their HI distribution to new optical R-band images and discuss their velocity fields. The first galaxy is a gas-rich unperturbed spiral whereas the second shows a peculiar HI distribution. The estimated 3$\sigma$ HI mass limit of our observations is ~ $7 10^{8} M_{\odot}$ for a line width of 150 km s-1. The non-detection of a considerable number of luminous spiral galaxies indicates that the spiral galaxies are HI deficient. The low detection rate is comparable to the HI deficient Coma cluster (Bravo-Alfaro et al. 2000). ACO 3627 is a bright X-ray cluster. We therefore suspect that ram pressure stripping is responsible for the HI deficiency of the bright cluster spirals.

Key words: galaxies: interactions -- galaxies: ISM -- galaxies: kinematics and dynamics

Offprint request: B. Vollmer, bvollmer@mpifr-bonn.mpg.de

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© ESO 2001