Physics
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..234c&link_type=abstract
NOAO Proposal ID #2000A-0234
Physics
Scientific paper
It has recently been shown that deep on-band/off-band imaging through ~ 50 Awide interference filters is an extremely efficient way of identifying the Ly(alpha) emission of starburst galaxies in the redshift range between 2.6 < z < 4.4. (At redshifts greater than 4.4, candidate lists of high-redshift galaxies become contaminated by local H(alpha) emitters, while at lower redshifts, instrument throughput becomes an issue.) However, there is not yet a reliable measurement of how the density of these systems changes with z. We propose to remedy this by tracing the evolution of Ly(alpha) emission galaxies from z=2.82 to z=3.78 by imaging 0.36 square degrees of the sky with the MOSAIC CCD imager and the Kitt Peak 4-m telescope. By using narrow-band filters at (lambda) 4650, (lambda) 5021, and (lambda) 5809, we will be able to isolate and detect the Ly(alpha) emission from redshifted starburst galaxies with relatively little contamination from foreground sources. Follow-up spectroscopy of the ~gt 60 expected targets with the Hobby-Eberly Telescope will then provide us with a measure of how the number of these sources evolves with redshift. These data will enable us to determine whether the star formation rate density of the universe declines at redshifts higher than z ~ 2, or whether star formation at early epochs was relatively constant.
Ciardullo Robin
Feldmeier John . J.
Gronwall Caryl
Jacoby George
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