May 9, 2012Open Access
NEUTRAL HYDROGEN OPTICAL DEPTH NEAR STAR-FORMING GALAXIES ATz≈ 2.4 IN THE KECK BARYONIC STRUCTURE SURVEY
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Abstract
We study the interface between galaxies and the intergalactic medium by measuring the absorption by neutral hydrogen in the vicinity of star-forming galaxies at z 2.4. Our sample consists of 679 rest-frame UV-selected galaxies with spectroscopic redshifts that have impact parameters 3 level, out to at least 2.8 Mpc (i.e., >9 comoving Mpc), but the scatter at a given distance is large compared with the median excess optical depth, suggesting that the gas is clumpy. Within 100 (200) kpc, and over 165 km s -1 , the covering fraction of gas with Ly optical depth greater than unity is 100 +0