Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3483d&link_type=abstract
HST Proposal ID #3483
Physics
Hst Proposal Id #3483
Scientific paper
Ly-alpha emission is potentially the best tracer of star formation at high redshift. At z > 1.7, Ly-alpha emission has been detected in powerful radio galaxies and recently in a few proto-galactic disks which give rise to damped Ly-alpha absorption in the spectra of background quasars. At low redshift, it has been detected in some starburst galaxies. However, not all the nearby starburst galaxies show Ly-alpha emission which may be due to either absorption by dust grains and/or the presence of an underlying B star population. At intermediate redshifts (z=0.5), objects giving rise to MgII absorption systems in quasar spectra have been identified with field galaxies of very extended gaseous envelopes. These galaxies show signs of stellar formation activity, revealed by their blue continuum and OII 3727 emission and which should also be traced by their Ly-alpha emission. We propose to observe the Ly-alpha emission of a few of these absorbing starburst galaxies with fairly strong OII 3727 (and H-beta) emission. This will help to ascertain their activity, to provide a link between the z=0.5 MgII absorbers and the z=2 proto-galactic disks, and to clarify the interpretation of Ly-alpha emission in high redshift galaxies.
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