Mathematics – Logic
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..321m&link_type=abstract
NOAO Proposal ID #1999B-0321
Mathematics
Logic
Scientific paper
We propose a new dynamical study of the local supercluster and its environs. This study will use a distance-limited, all-sky sample to characterize the properties of the velocity field out to 4,000 km/s and to measure cosmological quantities of interested associated with the nearby Universe. We propose to observe ~ 600 galaxies in the I band using the CTIO 1.5-m telescope over three semesters. These images will allow us to obtain precise galaxian inclinations, which are of the utmost importance to reduce errors in Tully-Fisher distances. These images - combined with shorter V-band exposures- will yield high-quality galaxian magnitudes in the standard system. We also propose to conduct shorter observations of ~ 700 galaxies present in the Mathewson & Ford (1996) database, in order to bring their magnitudes into the standard system. The proposed CTIO observations will be combined with ongoing observations at the Fred L. Whipple Observatory 1.2-m telescope and the forementioned Mathewson & Ford database to arrive at a complete, all- sky sample which will include 3,500 spirals suitable for studies with the Tully-Fisher relation. Our sample will be an order of magnitude larger than previous work, allowing us to improve upon current models of the velocity field of the local supercluster. This should allow us to determine the presence of shear and infall in the velocity field and to test for the presence of a bulk flow. By combining our velocity field with the improved determination of the density field to be obtained from 2MASS, we will resolve the current discrepancy between the Mark III velocity field and the IRAS gravity field, as well as the current dichotomy in values of Ω^0.6/b.
Huchra John P.
Macri Lucas M.
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