The Damped Lyman-alpha System -- Galaxy Connection: Clues from Local HI Galaxy Surveys

Details The Damped Lyman-alpha System -- Galaxy Connection: Clues from Local HI Galaxy Surveys The Damped Lyman-alpha System -- Galaxy Connection: Clues from Local HI Galaxy Surveys

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop...30e&link_type=abstract

NOAO Proposal ID #2006A-0030

Physics

Scientific paper

Damped Lyman-alpha systems (DLAs) trace the evolution of gas in galaxies. However, whilst almost every theoretical model of chemical evolution predicts that DLA metallicities should reach solar at z=0, observed values are barely 1/10 this value. One explanation for this is that the HI cross-section of the gas-rich galaxy population is not dominated by solar metallicity gas. We propose to use the relationship between stellar mass and metallicity to make an estimate of the HI cross- section weighted metallicity for a sample of local analogs to the DLA population. To achieve this, we need J, H and K-band observations to determine galactic stellar masses for 27 galaxies in our sample which do not appear in the 2MASS survey.

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