Abstract
INVESTIGATIONS with small radio telescopes1 have been unable to detect 21-cm radiation from galaxies much beyond those in the M 81 group, at a distance of 3 mega-parsecs. The uncertainties in the distances of individual galaxies, and thus in their masses, have made it difficult to compare the hydrogen content of different morphological types. There are considerable advantages in studying galaxies in one of the large clusters, for the members can be assumed to be at approximately the same distance. In the nearby groups there are no isolated elliptical or other early-type galaxies. A knowledge of the hydrogen content of these systems would be important for an understanding of their evolution, and in the large clusters there are numbers of such early-type galaxies suitable for investigation at 21 cm.
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ROBINSON, B., KOEHLER, J. Hydrogen Content of Virgo Cluster Galaxies. Nature 208, 993–994 (1965). https://doi.org/10.1038/208993a0
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DOI: https://doi.org/10.1038/208993a0
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