An H I survey of high-velocity clouds in nearby disk galaxies

Details An H I survey of high-velocity clouds in nearby disk galaxies An H I survey of high-velocity clouds in nearby disk galaxies

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423..180s&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 423, no. 1, p. 180-189

Astronomy and Astrophysics

Astronomy

31

Astronomical Models, Disk Galaxies, Far Infrared Radiation, Hydrogen Clouds, Star Formation, Emission Spectra, Infrared Astronomy Satellite, Interstellar Matter, Kinematics, Line Spectra

Scientific paper

We observed 14 nearly face-on disk galaxies with the Arecibo 305 m telescope and found the double-horned H I profiles to have high-velocity wings in 10 of these galaxies. Such wings can be caused by high-velocity clouds, similar to those observed in our own Galaxy. Disk galaxy models were constructed that include both high-velocity clouds (modeled as a component of galactic gas with a velocity dispersion of either 30 or 50 km/s) and warped H I disks. We find that the high-velocity wings can be reproduced by models with high-velocity clouds but not by models with warps that are similar to those observed in other galaxies. If these wings are due to high-velocity clouds, then the mass of neutral hydrogen in high-velocity clouds for the 10 galaxies ranges from 6 X 107 solar mass to 4 x 109 solar mass, which corresponds to 4% - 14% of the total H I in these galaxies. The galaxies with no detected high-velocity wings are also those with the lowest far-infrared fluxes as measured by Infrared Astronomy Satellite (IRAS), which is consistent with the galactic fountain model in which the young stellar population (responsible for most of the far-infrared emission produces supernovae which then provide the kinetic energy of the high-velocity clouds.

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