High velocity clouds in nearby disk galaxies

Details High velocity clouds in nearby disk galaxies High velocity clouds in nearby disk galaxies

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..199s&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 201-202 (SEE N93-26706 10-90)

Astronomy and Astrophysics

Astronomy

Astronomical Models, Cosmic Gases, Disk Galaxies, Galaxies, Hydrogen, Neutral Gases, Supernovae, Kinetic Energy, Magellanic Clouds

Scientific paper

Clouds of neutral hydrogen in our galaxy with the absolute value of v greater than 100 km/s cover approximately 10 percent of the sky to a limiting column density of 1 x 10(exp 18) cm(exp -2). These high velocity clouds (HVCs) may dominate the kinetic energy of neutral hydrogen in non-circular motion, and are an important though poorly understood component of galactic gas. It has been suggested that the HVCs can be reproduced by a combination of three phenomena: a galactic fountain driven by disk supernovae which would account for most of the HVCs, material tidally torn from the Magellanic Clouds, and an outer arm complex which is associated with the large scale structure of the warped galactic disk. We sought to detect HVCs in external galaxies in order to test the galactic fountain model.

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