Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-02-13
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
18 pages, 9 figures, accepted to Astron. J
Scientific paper
10.1088/0004-6256/137/5/4149
We study the velocity distribution of Milky Way disk stars in a kiloparsec-sized region around the Sun, based on ~ 2 million M-type stars from DR7 of SDSS, which have newly re-calibrated absolute proper motions from combining SDSS positions with the USNO-B catalogue. We estimate photometric distances to all stars, accurate to ~ 20 %, and combine them with the proper motions to derive tangential velocities for this kinematically unbiased sample of stars. Based on a statistical de-projection method we then derive the vertical profiles (to heights of Z = 800 pc above the disk plane) for the first and second moments of the three dimensional stellar velocity distribution. We find that
Beers Timothy C.
Bizyaev Dimitry
Brewington Howard
Dettbarn Christian
Fuchs Bernard
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