Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-21
Astrophys.J. 574 (2002) L115-L118
Astronomy and Astrophysics
Astrophysics
5 pages, 1 figure, accepted for publication in Astrophysical Journal Letters
Scientific paper
10.1086/342419
We have conducted pointed redshift surveys for galaxies in the direction of bright AGN whose HST far-UV spectra contain nearby (cz <~ 30,000 kms), low column density (12.5 <= log N_{HI} (cm s^{-2}) <= 14.5) Ly-alpha forest absorption systems. Here we present results for four lines-of-sight which contain nearby (cz <~ 3000 kms) Ly-alpha absorbers in galaxy voids. Although our data go quite deep (-13 <= M_{B}(limit) <= -14) out to impact parameters of 100-250 h_{70}^{-1} kpc, these absorbers remain isolated and thus appear to be truly intergalactic, rather than part of galaxies or their halos. Since we and others have discovered no galaxies in voids, the only baryons detected in the voids are in the Ly-alpha ``clouds''. Using a photoionization model for these clouds, the total baryonic content of the voids is 4.5% +/- 1.5% of the mean baryon density.
McLin Kevin M.
Penton Steven Victor
Shull Micheal J.
Stocke John T.
Weymann Ray J.
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