Mathematics – Logic
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..249s&link_type=abstract
NOAO Proposal ID #2000A-0249
Mathematics
Logic
Scientific paper
The distribution of dark matter on scales of a few megaparsecs is surprisingly not well understood, mainly due to the lack of precise distance estimates to nearby galaxies. It is almost impossible to measure consistent distances to a volume-limited sample of galaxies. Recently, the tip of the red giant branch (TRGB) method has been proven to be an excellent distance indicator. Comparison for several galaxies suggest that it is as accurate as the Cepheid variable star period- luminosity relation. The TRGB method is especially useful because it is applicable to all morphological types of galaxies, from ellipticals to spirals, to irregulars. Furthermore, these stars are very bright in IR (K ~eq -6) and are potentially a powerful tool in measuring consistent distances to all the galaxies within ~10 Mpc using the IR telescopes. However, there is presently no calibration for the IR TRGB method. The main objective of this proposal is to calibrate this method in IR by obtaining JHK photometry for a number of Galactic globular clusters.
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