Evolution of the Molecular Fraction of Damped Lyman-Alpha Absorption Systems

Details Evolution of the Molecular Fraction of Damped Lyman-Alpha Absorption Systems Evolution of the Molecular Fraction of Damped Lyman-Alpha Absorption Systems

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6237b&link_type=abstract

HST Proposal ID #6237

Physics

Hst Proposal Id #6237 Quasars

Scientific paper

Molecular hydrogen measurements are unique diagnostics of the physical conditions in the gas, including temperature, density, and ionizing background. The formation of molecular hydrogen depends as well on dust content. We will use the FOS to measure the column density and excitation of molecular hydrogen in a bright, moderate redshift damped Lyman-alpha absorption system. The very accurate H I column densty determined from the same spectrum will be combined with very high resolution, high signal-to-noise optical spectra to measure metal abundances and dust content. Additional indicators of metallicity, ionization, and dust content will come from metal absorption lines measured in the HST spectrum. The molecular fraction will be compared with the high redshift damped Lyman-alpha systems to study the evolution of these systems. Thus our measurements will provide clues to the nature of the damped Lyman-alpha absorption systems.

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