a Group or Cluster of Ly-Alpha Galaxies at Z ~ 0.26

Details a Group or Cluster of Ly-Alpha Galaxies at Z ~ 0.26 a Group or Cluster of Ly-Alpha Galaxies at Z ~ 0.26

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6611l&link_type=abstract

HST Proposal ID #6611

Physics

Hst Proposal Id #6611 Qso Absorption Lines

Scientific paper

We have recently identified seven galaxies of a group orcluster that appears to be associated with a pair of Ly-alphaabsorption features at z ~ 0.26 toward the QSO 3CR 323.1.Here we propose to measure the covering factor of theabsorbing material by obtaining a high-resolution spectrum ofthe Ly-alpha absorption lines using the GHRS. The outcome ofthe proposed observation will have important implications forestablishing the nature and origin of gas around galaxies:Either galaxies in groups or clusters can possess extendedgaseous disks or halos, or galaxy clusters can contain cool,smoothly distributed gas. We note that 3CR 323.1 is aparticularly bright QSO and that the Ly-alpha absorptionprofile occurs at the peak of Ly-alpha emission, where theobserved flux is f_Lambda = 4 * 10^-14 erg s^-1 cm^-2 AA^-1.This makes the acquisition of a GHRS spectrum extremelypractical, hence 3CR 323.1 provides a unique opportunity tostudy the relationship between a Ly-alpha absorption line anda group or cluster of galaxies.

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