Mathematics – Logic
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5970g&link_type=abstract
HST Proposal ID #5970
Mathematics
Logic
Hst Proposal Id #5970 Galaxies &Amp, Clusters
Scientific paper
Primeval galaxies are systems in the process of forming their first stellar populations. Despite intensive searches over more than a decade, the population of primeval galaxies has not been found and we remain essentially ignorant, from an empirical point of view, as to the early phases of galaxy formation and evolution. In view of this, we propose to obtain images with the WFPC2 of two radio-quiet, star-forming galaxies at z=3.4 that we have identified in the field around Q0000-263, and of another 14 z=3.4 galaxy candidates. The two galaxies with confirmed redshifts are very likely a nascent spheroidal system with relatively intense Ly-alpha emission, and a disc galaxy producing the damped Ly-alpha absorption in the spectrum of the QSO, respectively. The latter 14 galaxies have identical SEDs to the two with known redshift, and are also spatially clustered with them at the 98.8 be the most distant group or cluster of galaxies thus far identified. We propose the F702W filter to study the rest-frame UV light of the 16 galaxies in a spectral region that at z=3.4 corresponds to ~ 1600 Angstrom. This study is aimed at elucidating the morphology of the star-forming regions of two confirmed z=3.4 galaxies, probing the existence of the structural components such as disk and bulge, and at establishing the general morphological properties of the cluster candidates in comparison with other similarly faint (but foreground) galaxies in the field.
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