Physics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981nuria..28...75w&link_type=abstract
Nagoya University, Research Institute of Atmospherics, Proceedings, vol. 28, Mar. 1981, p. 75-86.
Physics
Elliptical Orbits, Hydrogen Clouds, Milky Way Galaxy, Orbit Calculation, Galactic Mass, Galactic Nuclei, Gravitational Fields, High Speed, Mass Distribution, Radio Observation
Scientific paper
A lower limit to the distance of a high velocity H I cloud (HVC) can be estimated from 21-cm radio observations taking into account the stability of the cloud with respect to the tidal disruption force produced by the gravitational field of the Milky Way. This method is applied to the 21-cm observations published by Meng and Kraus (1969) and Hulsbosch (1975); the lower limits to the galactocentric distances of apparently circular HVCs observed by these authors are between 20 and 100 kpc. It is found that the kinematics of HVCs which have small galactocentric distances can be explained in terms of elliptical orbits with eccentricities of greater than 0.9 if a galactic mass of 1.4 x 10 to the 11th solar masses is assumed. However, the kinematics of several HVCs cannot be explained under the assumption of this galactic mass because of large perigalaction distances and large galactocentric velocities; the possibility of a larger galactic mass, at least 6 x 10 to the 11th solar masses, is suggested.
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