The nature of low redshift damped Ly-α systems.

Details The nature of low redshift damped Ly-α systems. The nature of low redshift damped Ly-α systems.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999prama..53.1013k&link_type=abstract

Pramāna, Vol. 53, No. 6, p. 1013 - 1019

Physics

Quasars: Lyman-Alpha Systems, H I Absorption: Lyman-Alpha Systems

Scientific paper

Damped Ly-α systems are the major repository of the observed neutral H I at high redshift. These systems are most efficiently detected via absorption spectra taken against distant QSOs. The authors review some of the observational constraints on the nature of these objects, and also discuss the implications of observations of two low redshift damped absorbers, made with the Giant Metrewave Radio Telescope. They find that, for the lowest redshift (z = 0.0912) damped Ly-α system, if the system is a rotating gas disk, then the total associated H I mass has to be less than 2×109Msun, if the disk is at low inclination angles, and less than 1010Msun if the system is edge on.

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