The Milky Way Tomography with SDSS: III. Stellar Kinematics

Details The Milky Way Tomography with SDSS: III. Stellar Kinematics The Milky Way Tomography with SDSS: III. Stellar Kinematics

2009-08-31

arxiv.org/abs/0909.0013v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

90 pages, 26 figures, submitted to ApJ

Scientific paper

We study Milky Way kinematics using a sample of 18.8 million main-sequence stars with r<20 and proper-motion measurements derived from SDSS and POSS astrometry, including ~170,000 stars with radial-velocity measurements from the SDSS spectroscopic survey. Distances to stars are determined using a photometric parallax relation, covering a distance range from ~100 pc to 10 kpc over a quarter of the sky at high Galactic latitudes (|b|>20 degrees). We find that in the region defined by 1 kpc

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