Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..503c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 10, 1990, p. 503-514.
Astronomy and Astrophysics
Astrophysics
20
H I Regions, Hydrogen Clouds, Interstellar Gas, Absorption Spectra, Centimeter Waves, Emission Spectra
Scientific paper
Systematic emission and absorption surveys have been conducted for high-velocity H I in the direction of 63 bright continuum sources. High-velocity emisison is detected along 18 of these 63 directions with a threshold about a factor of 2 better than previous, much more extensive surveys. No high-velocity absorption was found in any of the directions. The sky distribution of the high-velocity emission and the column density distribution agree with larger surveys. Detailed emission maps in the vicinity of each continuum source show that the variations in column density within a high-velocity cloud are similar to the variations between high-velocity clouds. A previously discovered high-velocity cloud at high galactic latitude, in the direction of part of the Virgo Cluster of galaxies, was mapped. This small cloud is moving away from the galactic plane at v greater than 30 km/s and is probably not self-gravitating.
Colgan Sean J. W.
Salpeter Edwin E.
Terzian Yervant
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