Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198..125h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 125-134.
Astronomy and Astrophysics
Astrophysics
17
Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Ring Galaxies, Interstellar Gas, Polar Regions
Scientific paper
The pattern of the velocity distribution of high-velocity clouds provides evidence for the existence of two large subsamples of high velocity clouds (HVC's): (1) a subgroup of relatively nearby features; (2) a subgroup at large distances from the Sun. It is shown that existing observational data on HVC's of the second subgroup permit us to consider our Galaxy as a polar ring galaxy. The polar ring of the Milky Way is composed of the gas, rotating in a plane nearly perpendicular to the plane of the main disk of the Galaxy with the velocity about 200 km s-1. The outer radius of the ring system is estimated to lie around 90 kpc. The HVC's of the first subgroup can be considered as a result of interaction between the polar ring and galactic gas. Finally some preliminary ideas on the consequences of the existence of a gaseous ring-like structure around the Galaxy to the properties of the system of high-veloctiy clouds, the bending of the plane of the Milky Way, spiral structure, and the kinematics of the population of young stars are considered.
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