Search for a Relationship between the Local Lyα Forest and Galaxies: First Results

Details Search for a Relationship between the Local Lyα Forest and Galaxies: First Results Search for a Relationship between the Local Lyα Forest and Galaxies: First Results

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.6206m&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #62.06; Bulletin of the American Astronomical Society, Vol. 32, p.1285

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminary results from our pencil-beam galaxy redshift survey toward bright AGN observed with HST/GHRS and STIS. The AGN observed have been chosen to be nearby enough, z< ~0.1, so that we can observe even very faint dwarf galaxies, MB ~-16, between us and them. Our HST survey probes absorbers down to NHI ~ 1012.5 cm{-2}, comparable to the lowest column densities observed at high z. The purpose of our galaxy survey is to study what relationship, if any, exists between the nearby low column density Lyα clouds discovered in our HST absorber survey and galaxies along the lines of sight to the AGN. In particular, this survey tests the hypothesis that the Lyα forest is composed of extended galaxy halos. Our preliminary analysis seems to rule this out for the vast majority of absorbers. We do see evidence that some of the absorbers are associated with the larger scale galaxy distribution, supporting earlier HI observations. Additionally, on the basis of bright galaxy surveys, eight absorbers along five sightlines studied by us lie in galaxy voids (nearest galaxy ≳ 2 h-1 Mpc away). Our much deeper survey fails to find any nearby dwarf galaxies, solidifying the isolation of these absorbers.

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