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Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8740d&link_type=abstract
HST Proposal ID #8740
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Hst Proposal Id #8740 Cosmology
Scientific paper
Our current knowledge of the velocity field of galaxies in the local neighborhood {<= 500 km/sec} is surprisingly limited. Although tremendous progress has been made in recent years in mapping the large-scale gravitational field {out to scales of cz 10, 000 km/sec}, the major impediment to constraining the local flow is the lack of a consistent set of distances to nearby galaxies. Locally the deviations from a pure Hubble flow have been predicted to be large and measurable, as much as 1 magnitude{.} in distance modulus. Such an effect should be easily detectable or refutable. We have begun a project to measure the distances to a sample of galaxies with cz < 550 km/sec, specifically chosen to search for a strong anisotropy in the local flow field. Although previously no fast, accurate method was available to measure distances to nearby galaxies, this situation has recently changed. Distances may be measured using the discontinuity in the luminosity function at the tip of the red giant branch {TRGB}, a method with a solid empirical calibration having a precision comparable to Cepheid variables, but which is much more efficient in terms of observing time for nearby galaxies. We have previously been granted HST time to study 13 nearby galaxies; this proposal aims to examine archival data on other nearby galaxies in order to enlarge the sample size.
Davis Martin
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