Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..580s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 580-588.
Astronomy and Astrophysics
Astrophysics
43
Disk Galaxies, Galactic Evolution, Galactic Structure, Hydrogen Clouds, Interstellar Matter, Magellanic Clouds, Stellar Mass Ejection, Supernova Remnants
Scientific paper
The high-velocity neutral hydrogen complex C in optical (Ca K) absorption against stars at distances of 1-2 kpc has been detected, confirming a previous tentative detection and placing an upper limit on the distance to this complex. A similar (though as yet more uncertain) limit is placed to the distance to complex A. No complex is detected in absorption against any nearby star, effectively ruling out models in which the clouds are formed by supershells in the local disk. If these distances are representative of the bulk of the high-velocity clouds, the local mass infall rate is 6 x 10 to the -9th solar mass/sq pc/yr, which would supply the disk column density in 10 billion yr. The clouds lie above the bulk of the disk, and it is shown how they may be used to measure the pressure of the halo and to place an upper bound on the metagalactic UV flux.
Cowie Lennox L.
Songaila Antoinette
Weaver Harold
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