Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281..133b&link_type=abstract
The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb
Computer Science
1
Scientific paper
We have used HST to search for Ly-alpha absorption lines in the outer regions of eight nearby galaxies using background QSOs and AGN as probes. Ly-alpha lines are detected within a few hundred km/s of the systemic velocity of the galaxy in all cases. We conclude that a background line of sight which passes within 26-200h of a foreground galaxy is likely to intercept low column density neutral hydrogen with log N(HI) >~ 13.0. We show that the equivalent width and column density of Ly-alpha complexes (when individual components are summed over ~1000 km/s) correlate well with a simple estimate of the volume density of galaxies brighter than MB = -17.5 at the same redshift as a Ly-alpha complex. We do not reject the hypothesis that the selected galaxies are directly responsible for the observed Ly-alpha lines, but our analysis indicates that absorption by clumpy intragroup gas is an equally likely explanation.
Bowen David V.
Pettini Max
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