Mathematics – Logic
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6802g&link_type=abstract
HST Proposal ID #6802
Mathematics
Logic
Hst Proposal Id #6802 Cosmology
Scientific paper
Parallel MDS exposures have provided unique high resolution images which clearly supplement the primary HST surveys. For statistical programs in extragalactic and Galactic astronomy, source counts parameterized by morphology, magnitude, color, scale-length and orientation constitute an invaluable database for long term programs in cosmology, galaxy evolution and Galactic structure. We have already demonstrated fundamental progress in each of these areas during Cycle 4, with ongoing progress in Cycle 5. Highlights include the following results: {i} the observation of non-evolving and evolving {irregular} galaxy populations, the latter explaining the faint blue excess, {ii} the diversity of the irregular populations, {iii} the bulk of the familiar Hubble sequence was in place at z 0.5, {iv} the universe was dwarf-rich at z 0.3-0.5, {v} the discovery of weak galaxy-galaxy shear and constraints on massive halos, {vi} constraints on Omega and Lambda using ellipticals, {vii} a low evolution of the `major merger' rate, {viii} detection of faint compact nuclei in 6% of field galaxies at moderate z, {ix} discovery of HST-unique gravitational lenses which are powerful cosmological probes, {x} a bimodal color distribution in M87 globulars. With the level of progress and publications now well established, we request expansion of these exciting programs into Cycle 6, with an emphasis on the extraction of cosmological parameters.
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