Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4915r&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #49.15; Bulletin of the American Astronomical Society, Vol. 24, p.810
Astronomy and Astrophysics
Astronomy
Scientific paper
As galaxies evolve, neutral gas can disappear as a result of ionization or can be permanently lost from the interstellar medium when it becomes bound into low mass stars. Thus, the neutral gas content is one tracer that should be monitored in the study of galaxy evolution. For example, QSO absorption line studies are showing that gas-rich systems at high redshift (z > 2) have characteristics such as sizes, velocity dispersions and neutral hydrogen column densities similar to present-day spirals, and are thus thought to be their progenitors. Useful constraints can be placed on the evolution of these systems by comparing the properties of neutral hydrogen at the two epochs. We present an overall description of the distribution of HI in nearby (z ~ 0) galaxies. The analysis indicates that large spiral galaxies are the major contributors to the HI content as compared to galaxy types that populate the low luminosity end of the luminosity function. The possible contribution from low surface brightness galaxies, dwarfs and ellipticals is also discussed.
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