Atomic hydrogen deficiency in galaxies of the virgo and coma clusters: A new estimation method |
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| Authors: | E S Safonova |
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| Institution: | 1.Sternberg Astronomical Institute,Moscow State University,Moscow,Russia |
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| Abstract: | We propose a new method for estimating the HI deficiency in galaxies. The method is based on a semi-empirical relationship
between the total mass of HI and specific angular momentum of isolated galaxies. The atomic-hydrogen deficiency is estimated
for nearby spiral galaxies and for spiral galaxies in the Virgo and Coma clusters. The mean HI deficiencies determined for
these samples using our method are similar to those obtained with conventional methods, although there are considerable differences
in some cases. The HI deficiency in nearby galaxies does not depend on their degree of isolation, and there is no systematic
discrepancy between their HI and “normal” masses. Significant HI deficiencies are observed in the Virgo and Coma clusters,
out to distances of 1.5 and 3–4 Mpc from the cluster centers, respectively. At such distances, the ram pressure is too small
to sweep a considerable amount of gas from the galactic disks. Either these galaxies have passed through the dense cluster
center, or their gas deficiency is due to the fact that the halo had stopped accreting onto the disk when the galaxy entered
the cluster. |
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