Parameterization of the flow of halo high-velocity clouds

Details Parameterization of the flow of halo high-velocity clouds Parameterization of the flow of halo high-velocity clouds

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..408k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 2, Feb. 1985, p. 408-412. Sponsorship: Deutsche Forschungsgemeinschaf

Astronomy and Astrophysics

Astrophysics

50

Galactic Structure, High Speed, Milky Way Galaxy, Molecular Clouds, Neutral Gases, Radial Velocity, Galactic Evolution, Galactic Rotation, Ultraviolet Spectra

Scientific paper

The authors have analysed the velocities of the sample of high-velocity clouds detected by Giovanelli (1980). The sample can be made consistent with a flow of neutral gas clouds from the Milky Way halo to the disk, which is characterized by a z-velocity between 0 and -100 km s-1, and a galactocentric velocity of between 0 and -100 km s-1, while the cool material in the halo, being between 2 and 5 kpc from the disk, participates only to a limited extent in the differential rotation of the Milky Way. The overall behaviour suggests a galactic origin, supporting the hypothesis that the HVCs are the cooling part of the Galactic Fountain circulation. The inflow rate is about 3×10-3M_sun;kpc-2yr-1 as required by galactic evolution models but the gas may be of near solar composition.

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