Mathematics – Logic
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2067s&link_type=abstract
HST Proposal ID #2067
Mathematics
Logic
Hst Proposal Id #2067
Scientific paper
We propose to obtain high resolution images of galaxies involved in four of the best studied discordant redshift associations. Even short exposures in one color with the PC will give critical information on the nature of these systems. The data could be decisive in establishing whether the discordant galaxies are projected back-ground objects or are at a distance much closer than their redshifts would imply. The observations will 1) clarify the uncertain morphology of the discordant galaxy components and 2) allow a direct comparison of resolved detail (eg. HII regions, spiral arm width) for objects with different redshift, within each discordant pair or group. Large ground based telescopes have already established 1) that the discordant redshift components in galaxy systems are morphologically peculiar and 2) that direct signs of physical interaction exist between members of different redshift within the groups. Statistical studies also suggest that too many such discordant redshift groups are found. With a very small allotment of HST time, we have the opportunity to explore the nature of these objects which are critically important tests of one of the fundamental assumptions in astronomy.
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