Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8572s&link_type=abstract
HST Proposal ID #8572
Computer Science
Hst Proposal Id #8572 Quasar Absorption Lines And Igm
Scientific paper
Studies of faint, distant galaxies have greatly advanced in recent years. It is now possible to observe hundreds of galaxies out to z=1 and in the range 3 < z < 4.5, yet the redshift range 1 < z <3 remains largely unexplored. Galaxies selected by MgII absorption lines detected in quasar spectra are associated with normal galaxies up to redshifts z=1.2. We are extending this work to z = 2.5. We are already obtaining deep ground-based optical and near-infrared {VRIJK'} images of fields around quasars with MgII absorbers. We propose obtaining far-UV and CCD images of our QSO fields with STIS. The aims of the observing program are: {1} Identify galaxies which produce MgII absorption using the Lyman drop-out technique. The 912Angstrom Lyman break is observed at 2100Angstrom - 3200Angstrom for 1.3 < z < 2.5 so these galaxies will be absent from far-UV images below 2000Angstrom. {2} Obtain high resolution images to study MgII galaxy morphology. This can be accomplished extremely efficiently with STIS 50CCD imaging. Our main scientific goals are: {1} Find garden variety L^* galaxies at z 2 when the Universe is 20-25 as were found in the Steidel & Dickinson {1995} sample of MgII absorbers at z < 1.2. {2} Study the evolutionary history of MgII selected galaxies. If they are not typical L^* galaxies at z 2 as they are at lower redshifts, we will determine the redshift at which this change occurs.
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