Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10299p&link_type=abstract
HST Proposal ID #10299
Physics
Hst Proposal Id #10299 Galaxies
Scientific paper
We propose to carefully measure the morphology of z=5.7, narrow band selected Lyman Alpha emitters in the GOODS-S and UDF fields. The candidate objects will be selected using existing observations of these fields taken from the ground, under sub arcsecond seeing conditions, and using two narrow band filters {823 nm and 815nm}. While the number of detections of high redshift Lyman Alpha sources has been steadily increasing in the past year, very little is known about the source of the Lyman Alpha emission. The observed high Lyman Alpha equivalent widths of these objects have been explained using a variety of scenarios such as extreme youth of the stellar population, zero metallicity objects, energetic winds or type II quasars. Studying the morphology of these objects should provide us with a unique opportunity to differentiate between several processes believed to be behind the observed Lyman Alpha emission. Recently, and soon to be made, public HST ACS observations of the GOODS/UDF fields, with their high angular resolutions and its well calibrated, stable PSF provide us with a unique opportunity to study the clumpiness and spatial extension of these objects.
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