Catching them Young: Galaxies at z=5.7 and z=6.6

Details Catching them Young: Galaxies at z=5.7 and z=6.6 Catching them Young: Galaxies at z=5.7 and z=6.6

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..370r&link_type=abstract

NOAO Proposal ID #2000A-0370

Computer Science

Scientific paper

Many recent discoveries of high redshift galaxies have pushed back the age of galaxy formation to z> 5. These include discoveries of galaxies at z > 5, and of evolved, dusty objects with old populations at what are now considered modest redshifts of 3.5-4.5. Since searches for Ly-(alpha) emitting galaxies were predicted to find young galaxies in the throes of the first stages of star-formation, before they chemically enrich the surrounding material to produce dust, it is vital to push back the searches of Ly-(alpha) emitters to earlier cosmic times. To quantify evolution and galaxy formation between z=4.5 and 6.6, we propose a large area (one Mosaic field: 36' ≈ 75 Mpc) search for galaxies with strong Ly-(alpha) line emission at redshifts 5.75 and 6.75, using clean windows free of night sky lines. The number density of emitters from this survey will be compared to those found with our previous, successful, survey at z=4.5 to study the evolution of galaxies with strong Ly-(alpha) line. This sample shall also facilitate comparison of the relative numbers of Ly-(alpha) line emitters having little continuum with galaxies found by the dropout method which have strong continuum and varying Ly-(alpha) line strength. The relative number of these two populations at 3 redshifts will give a measure of the evolution of population of galaxies.

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