The Evolution of the Damped Ly-alpha Systems

Details The Evolution of the Damped Ly-alpha Systems The Evolution of the Damped Ly-alpha Systems

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2808r&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #28.08; Bulletin of the American Astronomical Society, Vol. 27, p.852

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The determination of the incidence of damped Lyalpha systems in the redshift interval 0 ~ 0.8 that is consistent with the trend at higher redshift as well as the number density at the current epoch inferred from HI cross-sections of nearby disk galaxies. The result that n(z) at low redshift conforms to a trend established by three different observing techniques over three redshift regimes provides evidence that this trend actually traces the evolution of neutral gas in galaxies. Implications for the evolution of n_DLyalpha (z) and Omega_HI (z), the cosmological mass density of neutral hydrogen, are discussed.

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