Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.8501l&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #85.01; Bulletin of the American Astronomical Society, Vol. 30, p.1379
Other
Scientific paper
It has been shown, using simulations, that the majority of Lyalpha absorbers at low redshift may arise in low surface brightness galaxies (Linder 1998, ApJ, 495, 637). The simulated galaxy population is 'observed' using selection criteria similar to those of observational surveys. I show that it will be difficult for an observer to determine the correct relationship between absorbers and galaxies or to learn about the absorption properties of galaxies which are typically not found due to observational selection effects. An anticorrelation between neutral hydrogen column density and impact parameter (between the galaxy and line of sight) will likely be observed for a variety of scenarios, whether or not the identified galaxies actually give rise to the absorption. While some stronger Lyalpha absorbers must be associated with particular galaxies, such an anticorrelation can occur largely as a result of galaxy selection effects. Therefore other tests, such as those in which the absorption cross sections of galaxies are examined for a wide range of galaxy properties, will be needed to establish the relationship between galaxies and Lyalpha absorbers.
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