NOAO >   Observing Info >   Approved Programs >   2001B-0337

Small NOAO Logo

Proposal Information for 2001B-0337


PI: Caryl Gronwall, Johns Hopkins University, caryl@pha.jhu.edu
Address: 3400 North Charles Street, Baltimore, MD 21218

CoI: Robin Ciardullo, Penn State University
CoI: John Feldmeier, Case Western Reserve University
CoI: George Jacoby, WIYN Consortium

Title: The Evolution of Galaxies Between z=2.8 and z=3.8

Abstract: 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 strongly star- forming galaxies at redshifts of z ~ 3. However, there is not yet a reliable measurement of how the density of these systems changes with redshift. 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. The identify of these sources will then be confirmed via spectroscopy from the Hobby- Eberly Telescope. The high equivalent-width objects targeted in this proposal are most likely metal and dust poor; they are therefore likely to be primeval objects undergoing their initial burst of massive star formation. By observing these objects at z ~ 3, our observations will probe the crucial regime near the peak of the star formation rate density, when most galaxy formation is expected to occur. These data will therefore complement the existing surveys for higher-redshift (z > 4) objects, and provide important constraints on models of when and how galaxies form.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2001B-0337

noaoprop-help@noao.edu

Small NOAO Logo