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02 November 2024
 
  » arxiv » astro-ph/9307005

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The Environment of Lyman a Absorbers in the Sightline toward 3C273
S. L. Morris ; R. J. Weymann ; Alan Dressler ; P. J. McCarthy ; B. A. Smith ; R. J. Terrile ; R. Gionvanelli ; M. Irwin ;
Date 5 Jul 1993
Subject astro-ph
AbstractWe present new ground-based data following up on the HST discovery of low-redshift Lya absorption in the sight-line to the quasar 3C273. Narrow-band filter observations show that there are no H II regions within a 12 kpc radius of the line-of-sight to the quasar, at the velocities of three of the absorbers. Broad-band imaging shows that there are no dwarf galaxies at Virgo distances with absolute magnitude above MB~-13.5 and within a radius of 40 kpc. We present fiber spectroscopy of galaxies within a radius of 1 deg, down to an apparent magnitude of B~19. We show that the absorbers are definitely not distributed at random with respect to the galaxies, but also that the absorber-galaxy correlation function is not as strong as the galaxy-galaxy correlation function on large scales. Our data are consistent with the hypothesis that all galaxies more luminous than 1/10 L* have effective cross-sections (for association with absorbers with Log(NH)>13.0), of between 0.5 and 1 Mpc. We also show a clear case of a Lya absorber which has no galaxy brighter than MB=-18 within a projected distance of 4.8 Mpc, and discuss the possibility that Lya absorbers are destroyed in a rich galaxy environment.
Source arXiv, astro-ph/9307005
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