Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5971g&link_type=abstract
HST Proposal ID #5971
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #5971 Galaxies &Amp, Clusters
Scientific paper
We have shown that randomly-positioned parallel WFPC exposures obtained via the Medium Deep Survey {MDS} provide unique high resolution imaging data which cannot be obtained in reasonable allocations of primary time. For statistical programs in extragalactic and Galactic astronomy, source counts parameterized by morphology, magnitude, color and scale-length constitute an invaluable database for long term programs in cosmology, galaxy evolution and Galactic structure. Although the original goals of the MDS were severely limited in Cycles 1-3, we have demonstrated dramatic progress in each of these areas in the 6 months during which Cycle 4 data has been available. Highlights include the realization that the bulk of the familiar Hubble sequence of galaxies was in place at z eq0.5, the recognition of large numbers of faint irregular galaxies, and our ability to discover unusual objects by virtue of the large areas spanned by the MDS. Considering the accelerated progress now established, we are requesting continuation of the MDS into Cycle 5. Our new strategy takes full account of our projected achievements in Cycle 4 and is optimized to explore the unique parameter space of parallel data more effectively viz. {i} building up significant samples of rare objects {e.g. lensed objects, peculiar galaxies, faint stars}, {ii} studying the sources which hold the key to resolving the faint blue galaxy problem. Our proven on-going access to large ground-based telescopes is a major strength of the team.
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