More evidence of substructure in the motions of nearby halo stars

Details More evidence of substructure in the motions of nearby halo stars More evidence of substructure in the motions of nearby halo stars

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ogci.conf..508r&link_type=abstract

Outskirts of Galaxy Clusters: Intense Life in the Suburbs. Edited by Antonaldo Diaferio, IAU Colloquium #195, p.508-510

Physics

Scientific paper

We explore the stellar halo of the Milky Way to search for fossil signatures of past mergers. We use the Beers et al. (2000) catalog of non-kinematically selected metal poor stars in the solar neighborhood to select subsets of halo stars within 1-2 kpc of the Sun. Motivated by the results of high resolution CDM simulations, we look for substructure in the kinematics of the fastest stars. When a two-point velocity correlation function is applied to these subsets, statistical evidence of substructure is found. This appears to be due to a small moving group with dynamical properties similar to the stellar "stream" previously discovered by Helmi et al. (1999).

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