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ATCA 21 cm HI observations of the rich galaxy cluster ACO 3627 in the GreatAttractor region are presented. Three fields of 30' diameter located within oneAbell radius of ACO 3627 were observed with a resolution of 15'' and an rmsnoise of \sim 1 mJy/beam. Only two galaxies were detected in these fields. Wecompare their HI distribution to new optical R-band images and discuss theirvelocity fields. The first galaxy is a gas-rich unperturbed spiral whereas thesecond shows a peculiar HI distribution. The estimated 3-sigma HI mass limit ofour observations is \sim 7 x 10^8 M_{\odot} for a line width of 150 km s^{-1}.The non-detection of a considerable number of luminous spiral galaxiesindicates that the spiral galaxies are HI deficient. The low detection rate iscomparable to the HI deficient Coma cluster (Bravo-Alfaro et al. 2000). ACO3627 is a bright X-ray cluster. We therefore suspect that ram pressurestripping is responsible for the HI deficiency of the bright cluster spirals.

HI deficiency in the galaxy cluster ACO 3627