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28 March 2024
 
  » arxiv » astro-ph/9607067

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The HI Environment of Nearby Lyman-alpha Absorbers
J. H. van Gorkom ; C. L. Carilli ; John T. Stocke ; Eric S. Perlman ; J. Michael Shull ;
Date 12 Jul 1996
Subject astro-ph
AffiliationColumbia University), C. L. Carilli (NRAO), John T. Stocke (CASA-University of Colorado-Boulder), Eric S. Perlman (LHEA-GSFC), and J. Michael Shull (JILA-University of Colorado-Boulder
AbstractWe present the results of a VLA and WSRT search for HI emission from the vicinity of seven nearby clouds, which were observed in Lya absorption with HST toward Mrk335, Mrk501 and PKS2155-304. We searched a volume of 40’ x 40’ x 1000 km/s. The HI mass sensitivity (5 sigma) varies from 5x10^6 to 5x10^8 Msun. We detected HI emission in the vicinity of four out of seven absorbers. The closest galaxy is a small dwarf galaxy at a projected distance of 68/h kpc from the sight line toward Mrk335. It has the same velocity (V=1970 km/s) as one of the absorbers, and has an HI mass of only 4x10^7 Msun. We found a more luminous galaxy at the velocity (V=5100 km/s) of one of the absorbers toward PKS2155-304, 230/h kpc from the sight line. Two other, stronger absorbers toward PKS2155-304 at V=17,000 km/s are associated with a loose group of three bright spiral galaxies, at projected distances of 300 to 600/h kpc. These results support the conclusion that most nearby Lya forest clouds trace the large-scale structures outlined by optically luminous galaxies. We do not find any evidence for a physical association between an absorber and its closest galaxy.
Source arXiv, astro-ph/9607067
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