The Relationship Between Lyman-Alpha Clouds and Galaxies at z<0.3

Details The Relationship Between Lyman-Alpha Clouds and Galaxies at z<0.3 The Relationship Between Lyman-Alpha Clouds and Galaxies at z<0.3

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6499l&link_type=abstract

HST Proposal ID #6499

Physics

Hst Proposal Id #6499 Qso Absorption Lines

Scientific paper

Recent studies suggest that most strong {rest equivalent width w_r>300mAngstrom}, low redshift {z<1} Ly-alpha absorbing clouds in quasar spectra are associated with luminous galaxies, but the relationship between the weaker Ly- alpha absorbers {w_r<300mAngstrom} and galaxies is still unclear. There is some evidence that the weaker Ly-alpha absorbers may form a distinct population from the stronger ones, but such a proposition cannot be rigorously tested at the present because of the very small number of known Ly- alpha absorbers with w_r<300 mAngstrom. We propose to obtain very high S/N {90:1 per diode} observations of the LyAlpha forest region of two low-redshift quasars PG0953+414 {z_em=0.234} and PG1116+215 {z_em=0.177} with the GHRS G140L grating. This will allow us to detect LyAlpha absorption lines as weak as 50 mAngstrom in rest equivalent width. These new measurements, when combined with similar observations of H1821+643 {z_em=0.297} which we will obtain in Cycle 5, will increase the sample size of low redshift weak LyAlpha absorbers {w_r<300 mAngstrom} from the existing number of 20 to 70. The combination of these HST observations with ground -based imagery and multi-object spectroscopic observations of galaxies in the quasar fields will allow us to investigate the relationship between weak LyAlpha absorbers and galaxies at z<0.3 on a much firmer statistical ground than previously possible. The study is essential for understanding the nature of LyAlpha clouds which has important implications for galaxy formation and evolution in the universe.

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