Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541314b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #413.14; Bulletin of the American Astronomical Society, Vol. 42, p.252
Astronomy and Astrophysics
Astrophysics
Scientific paper
We have identified large samples of stars from the SDSS/SEGUE DR7 data release with radial velocities in the Galactic rest frame greater than +/- 150 km/s, reflecting membership in the halo populations of the Milky Way. According to the dual (inner/outer) halo structure noted by Carollo et al. (2007), the stars with moderately high velocities are most likely to be dominated by the inner-halo population, while those with more extreme velocities are most likely to be associated with the outer-halo population. We first test the distribution of observed velocities to see if a single population halo is compatible with these data, or if (at least) a dual halo is necessary. We then use this information to attempt a de-coupling of the overlapping metallicity distribution functions for these two components.
This work was supported in part by grants PHY 02-16783 and PHY 08-22648: Physics Frontiers Center / Joint Institute for Nuclear Astrophysics (JINA), awarded by the U.S. National Science Foundation.
Beers Timothy C.
Carollo Daniela
Gould Andrew
Knapp Gillan R.
Kollmeier Juna A.
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