Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21523306p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #233.06; Bulletin of the American Astronomical Society, Vol. 42, p.597
Astronomy and Astrophysics
Astronomy
Scientific paper
The results from four SIM Science Studies are presented. The "GAIA-SIM Legacy Project" analyzes the long-term astrometric benefits that arise from the currently sequential ordering of the GAIA and SIM missions. Several issues will affect any attempts to utilize the combined datasets, such as the reference frames used, and the precise coordinate definition of the observable quantities in both missions.
The second project "Determining the nature of dark matter using proper motions of stars in the Milky Way satellites" is focused on developing methods that would allow the interpretation of SIM observations of these targets in order to derive the slope of the density of dark matter near the centers of dwarf spheroidal galaxies. Since steep density cusps are predicted from cold dark matter models, and shallow density slopes are expected in warm dark matter models, these observations should allow one to determine the microphysical properties of the dark matter particle.
"Sizes and Shapes of Kuiper Belt Objects and Centaurs with SIM" investigated the use of SIM to target these primordial solar system objects, in order to measure precise sizes and shapes. This will involve using non-sidereal tracking, as well as visibility measurements using the co-linear guide interferometer baseline.
The fourth project "1% Luminoisty-Independent Distances to nearby Galaxies with the Rotational Parallax Technique" investigates the use of this geometric method that can be used to sample a large part of the stellar disk of external galaxies (which allows non-axisymmetric motions to be determined). Accurate RP distances will facilitate detailed comparisons between almost all standard candles (MW, M31, M33, LMC, and NGC 4258). These cross-checks are crucial if we are to believe galaxy distances (and H0) at the 1% level.
The SIM Science studies have been funded by the SIM Project Office, NASA/JPL.
Anglada Guillem
Kaplinghat Manoj
Kuchner Marc J.
Olling Rob
Patterson Richard J.
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