Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6610w&link_type=abstract
HST Proposal ID #6610
Computer Science
Hst Proposal Id #6610 Cosmology
Scientific paper
We request 27+28 orbits in Cycle 6 and 45 in Cycle 7 to obtain narrow-band redshifted LyAlpha, plus B & I-band imaging of rich groups and clusters of young compact galaxies at z eq 2.4. The goal is to obtain definite clues to galaxy formation, and to see how this proceeded from {the merging of} compact ``sub-galactic clumps'' since z 2-3. In recent deep WFPC2 images, we discovered a spectacular number of well-detected, compact { 1 kpc} Ly-alpha emitters in F410M at z 2.4, with 3 confirming spectroscopic z's. These numerous sub-galactic objects make up a signifcant part of the faint blue galaxy counts for B eq 23-28 mag. Our hypothesis is that they occur in the range z 1-3.5, being the building blocks of the luminous galaxies that we see today. If so, this would have far-reaching consequences to theories of galaxy formation {e.g. CDM} and of large scale structure. Hence, we need confirmation of the universality of these objects by observing independent WFPC2 fields, one with several known z=2.4 QSO's, and two blank sky fields. The images will be used to: {1} locate 70 Ly-alpha emitting sub-galactic clumps at z eq 2.37+/-0.05 within 3', determine their Ly-alpha fluxes and SFR; {2} determine their LF and constrain the luminous mass spectrum at z=2.4; {3} determine their size distribution and their relation to QSO absorption clouds; and {4} combined with CO-detections, determine the gas-to-stellar mass conversion rate and the efficiency of galaxy formation at z 2.4.
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