Sagittarius stream 3-d kinematics from SDSS Stripe 82

Abstract

Using multi-epoch observations of the Stripe 82 region done by Sloan Digital Sky Survey, we measure precise statistical proper motions of the stars in the Sagittarius stellar stream. The multi-band photometry and SDSS radial velocities allow us to efficiently select Sgr members and thus enhance the proper motion precision to ~0.1 mas/yr. We measure separately the proper motion of a photometrically selected sample of the main sequence turn-off stars, as well as of a spectroscopically selected Sgr giants. The data allow us to determine the proper motion separately for the two Sgr streams in the South found in Koposov et al.(2012). Together with the precise velocities from SDSS, our proper motion provide exquisite constraints of the 3-D motions of the stars in the Sgr streams.

9 pages, 6 figures. Accepted to ApJ

References in corpus (8)

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• The Origin of the Bifurcation in the Sagittarius Stream
• Galactic masers and the Milky Way circular velocity
• Light and Motion in SDSS Stripe 82: The Catalogues
• A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: Variation of the Metallicity Distribution Function Along the Sagittarius Stream
• M Dwarfs in SDSS Stripe 82: Photometric Light Curves and Flare Rate Analysis
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• New UltraCool and Halo White Dwarf Candidates in SDSS Stripe 82