Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..572e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Aug. 1991, p. 572-588.
Astronomy and Astrophysics
Astronomy
24
Galactic Structure, H I Regions, Radio Telescopes, Sky Surveys (Astronomy), Spiral Galaxies, Astronomical Spectroscopy, Far Infrared Radiation, Infrared Astronomy Satellite, Star Formation, Stellar Luminosity
Scientific paper
This paper presents the results of a sensitive 21-cm survey of massive early type galaxies made with the Arecibo radio telescope. Of the 81 galaxies observed, the detections comprise 48 percent of the S0s, 73 percent of the S0a's, and 96 percent of the Sa's. The values of the hybrid, distance-independent H I surface densities of the S0 galaxies in the sample ranged continuously from amounts comparable to the most gas-rich Sa galaxies to low estimated upper limts of the H I content. CCD images of most of the gas-rich S0s revealed either faint spiral features or patchy structure in the disks. While no firm correlation between H I content and environmental density is apparent for the galaxies in the sample, two-sample statistics suggest a difference between the highest and the lowest density bins. Early-type disk galaxies within low density environments tend to have higher gas surface densities than those within high-density environments.
Eder Josef
Giovanelli Riccardo
Haynes Martha P.
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