Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9162t&link_type=abstract
HST Proposal ID #9162
Other
Hst Proposal Id #9162 Cosmology
Scientific paper
Dark matter is the main constituent of the universe, yet we do not know how much there is, how it is distributed, or its composition. Galaxies contain dark matter that extends many tens of kiloparsecs from their centers, but we do not know the limits. The distribution of total mass in the universe can be determined by modelling the orbits galaxies have followed. Seven components of phase space per object are needed to solve the gravitational mechanics. One accessible component is distances which can be efficiently obtained with the TRGB method to an accuracy of better than 10%. Together with the other 6 known components; RA, DEC, cz, and the three components of peculiar velocity at t=0 {which were zero in a homogeneous early universe}, one can solve for the masses, the mass distributions, and the orbits of about 120 galaxies at <5 Mpc. We compute orbits with the Numerical Action method developed by Peebles. TRGB distances for 28 galaxies will be determined in this program. In combination with other sources, a total of about 100 galaxies within 5 Mpc will have accurate distances. This HST data will constrain the mass distribution of galaxies plus total masses for the nearest 4 groups. A subset of these galaxies will be selected for proper motion studies with the Space Interferometry Mission. SIM will overconstrain the models with another 2 components of the velocity vector per galaxy.
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