Studies of high-velocity clouds. I - A high-sensitivity survey

Details Studies of high-velocity clouds. I - A high-sensitivity survey Studies of high-velocity clouds. I - A high-sensitivity survey

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85.1155g&link_type=abstract

Astronomical Journal, vol. 85, Sept. 1980, p. 1155-1181.

Astronomy and Astrophysics

Astronomy

82

Galactic Structure, Gas Flow, Hydrogen Clouds, Neutral Gases, Spectrum Analysis, Velocity Distribution, Galactic Rotation, Gas Density, Radial Velocity, Sensitivity, Tables (Data)

Scientific paper

The results of the first part of a high-sensitivity, high-velocity survey in the 21-cm transition of H I are presented. Over 6000 spectra have been collected, with an RMS noise of less than 0.01 K and usable velocity coverage between about -900 and +900 km/s. Many previously unreported features have been found, including three objects believed to be nearby galaxies. On the basis of the findings of the survey, the large-scale properties of the high-velocity gas are analyzed. They may be summarized as follows: (1) roughly ten percent of the sky is populated by high-velocity H I, with typical column density around 10 to the 19th/sq cm; (2) the distribution is very asymmetric with respect to galactic location, radial velocity, and structural properties; (3) the global velocity field with respect to the LSR is consistent with being largely influenced by the rotation of the LSR around the galactic center; (4) very-high-velocity clouds (LSR velocity greater than 300 km/s) are found only in one quadrant of galactic coordinates: l in the interval 0-180 deg, South; they are found only with negative velocities; and (5) the known tendency of high-velocity gas to form large complexes is even stronger than previously thought. Several features extending over 50 deg dominate the distribution. The phenomenon is less pronounced for positive-velocity clouds and especially for the very high negative-velocity objects outside the Magellanic Stream.

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