Mathematics – Logic
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..106m&link_type=abstract
NOAO Proposal ID #1999A-0106
Mathematics
Logic
Scientific paper
We propose to obtain high velocity resolution and high spatial resolution optical rotation curves from H(alpha) emission lines for a sample of well studied low surface brightness disk galaxies with blue central surface brightnesses ranging from 22.8 to 24.7. In addition to optical surface photometry, 21 cm rotation curves already exist. These data have been widely used to infer the mass distribution of dark matter halos and to test galaxy formation models. However, these results are controversial because of the low spatial resolution of the 21 cm data. We propose to resolve the controversy by obtaining high spatial resolution optical velocities. The resultant combined data set would be a powerful tool for mapping the mass distribution of dark matter halos, a quantity of fundamental interest. In the context of the popular cold dark matter (CDM) model, it also has the potential to help constrain cosmological parameters, as the mass distributions of CDM halos retain information about the cosmology in which they form. Experience with the 2.1-m indicates that high quality observations for the sample will require a 4-m class telescope.
de Blok Erwin
McGaugh Stacy
RUBIN Vera
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