The relationship between Lyα forest absorbers and galaxies: finding the keys at the lowest redshifts

Details The relationship between Lyα forest absorbers and galaxies: finding the keys at the lowest redshifts The relationship between Lyα forest absorbers and galaxies: finding the keys at the lowest redshifts

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pgqa.conf...50s&link_type=abstract

Probing Galaxies through Quasar Absorption Lines, IAU Colloquium Proceedings of the International Astronomical Union 199, held M

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Using 138 low column density (nHI=1012.5-16.5 cm-2) lyα "forest" absorbers discovered by HST at z ≤ 0.15 and nearly one million low-z galaxy redshifts from on-going surveys, we find that:although nearly 80% of Lyα forest absorbers are found within galaxy filaments, very few of them can be identified plausibly with bright (≥ 0.1 l*) galaxies. Either these absorbers are not related to any one individual galaxy or the individual galaxy to which they are related is fainter than 0.1 l* (mb ≥ -17). O VI absorbers (h i+O VI) are found exclusively in galaxy filaments at median distances half as far away from the nearest galaxy as the Lyα absorber population from which they were selected (nHI=1013.5-16.5 cm-2).our work on individual absorber-galaxy associations at the lowest redshifts finds cases where low column density (nHI = 1013.5-16.5 cm-2) metal-enriched absorbers appear to be due to unbound winds from dwarf galaxies while higher column density (nHI=1017.3-20 cm-2) absorbers are found in the bound halos of massive galaxies. Therefore, both the statistics and a few well-studied examples lead us to propose that the low-z igm (and the Lyα forest absorbers in particular) are enriched in metals by outflowing winds from dwarf galaxies.

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