Understanding Physical Conditions in High Redshift Galaxies through CI Absorption Lines

Details Understanding Physical Conditions in High Redshift Galaxies through CI Absorption Lines Understanding Physical Conditions in High Redshift Galaxies through CI Absorption Lines

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7203j&link_type=abstract

American Astronomical Society, AAS Meeting #211, #72.03; Bulletin of the American Astronomical Society, Vol. 39, p.863

Astronomy and Astrophysics

Astronomy

Scientific paper

A central question in defining the nature of the high-redshift progenitor galaxies known as Damped Lyman-alpha Systems (DLAs), involves the temperature of the gas. 21-cm absorption studies show the gas should be primarily Warm Neutral Medium (WNM), while CII* absorption studies have argued DLAs consist of primarily Cold Neutral Medium (CNM) gas. We have used CI fine structure lines to determine temperatures less than 1500K, specifically, 60K < T <100K. This supports the picture in which DLAs are similar to the Milky Way but with lower metallicites, 1/30 the gas to dust ratio and similar Jν, the radiation due to star formation.

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