A constraint on the infall of H I into big disk galaxies

Details A constraint on the infall of H I into big disk galaxies A constraint on the infall of H I into big disk galaxies

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1982b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, Oct. 1985, p. 1982-1988.

Astronomy and Astrophysics

Astronomy

20

Disk Galaxies, Galactic Evolution, Hydrogen Clouds, Spiral Galaxies, Galactic Structure, Luminosity, Milky Way Galaxy

Scientific paper

Available 21-cm observations of late-type spirals from a variety of sources have been used to construct an H I luminosity function for spirals with M(B) less than -18. The function is found to have a rather abrupt cutoff at long M(H) of about 10.2. In the log M(H) range between 9.0 and 10.0 this function is well represented by a power law with slope near unity. There is no apparent increase in H I mass as the ratio of beam size area to optical galaxy area increases and over that predicted from the linear size of the galaxy. A conservative upper limit on halo H I content of 1/3 that presently distributed in the disk is obtained. Based on these data, it is argued that if infall is still important at the present time in the evolution of big disk galaxies, then the reservoir should be detectable unless it is predominantly in a form more exotic than atomic hydrogen.

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