Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10324g&link_type=abstract
HST Proposal ID #10324
Physics
Hst Proposal Id #10324 Cosmology
Scientific paper
The discovery of large numbers of Lyman-break galaxies has revolutionized our ability to study the distant universe. Today, narrow-band surveys have finally caught up and are detecting Ly-alpha emission-line galaxies {ELGs} from z=2.4 to z=6.5. These are important objects: not only do they sample a part of the galaxy luminosity function that is inaccessible to the Lyman-break technique, but they also tend to be younger and less chemically evolved. As a result, these ELGs present us with a unique opportunity to study galaxies in the process of formation. We have performed several ground-based narrow-band surveys for ELGs at z 3.1, including one centered on the Chandra Deep Field South. Spectroscopy has confirmed that our objects have broad { 450 km/s}, asymmetric line profiles, consistent with that of a starburst galaxy. We propose to use archival HST ACS WFC observations of the Chandra Deep Field South from the GOODS treasury program to study the morphology of Ly-alpha ELGs at z=3.11. Our recent ground-based survey of this field contains about 10 Ly-alpha ELGs within the GOODS ACS WFC pointings. The F775W and F850LP images will detect the objects' rest-frame UV continuum, and allow us to measure their structure on sub-kpc scales. With these data we can probe the physical nature of these distant objects and derive important new insights on the nature of galaxy formation. In addition, we will directly compare the properties of our ELGs to similar objects found at higher redshift {4 < z < 7}, and to the Lyman-break galaxies contained in the field. This sample is an important lower redshift counterpart to recent discoveries of Ly-alpha ELGs at higher redshift {z = 4 - 7}. In addition, we will be able to directly compare the properties of the emission-line sources to Lyman-break galaxies at the same redshift in the same field discovered by the GOODS team.
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