Mapping Globular Cluster Tidal Streams

Details Mapping Globular Cluster Tidal Streams Mapping Globular Cluster Tidal Streams

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..171g&link_type=abstract

NOAO Proposal ID #2006A-0171

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Scientific paper

The primary scientific goal of this program is to detect and map the tidal streams emanating from halo globular clusters. We propose to obtain moderately deep V and I imaging of the regions within 2° of the centers of five globular clusters with R_sun < 50 kpc and with a high probability of having strong tidal tails. Given that these cold tidal streams are on essentially the same orbits as their parent clusters, they can be used to constrain both the formation and evolution of the Galactic halo as well as the present shape of the Galactic potential field. With follow-up spectroscopy to eliminate foreground contaminants, the stars in these tidal streams will be used to construct a high-priority target list for the Space Interferometry Mission (SIM). Proper motion measurements of these stars with SIM will enable us to tightly constrain the detailed, three-dimensional structure of the Galactic potential field from the Solar Circle out to 50 kpc.

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