Absolute Proper Motion of the Sagittarius Dwarf Galaxy and of the Outer Bulge from SPM3

Details Absolute Proper Motion of the Sagittarius Dwarf Galaxy and of the Outer Bulge from SPM3 Absolute Proper Motion of the Sagittarius Dwarf Galaxy and of the Outer Bulge from SPM3

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..338..260d&link_type=abstract

Astrometry in the Age of the Next Generation of Large Telescopes, ASP Conference Series, Vol. 338, Proceedings of a meeting held

Astronomy and Astrophysics

Astronomy

Scientific paper

We have determined the absolute proper motion of the Sagittarius dwarf spheroidal galaxy (Sgr) from the Southern Proper Motion Catalog 3, by selecting red giant candidates from the Two Micron All Sky Survey. We obtain μl cos b = -2.35 ± 0.20 and μb = 2.07 ± 0.20 mas yr-1. Using the same procedure, we also determine the absolute proper motion of the bulge in the region of the sky that overlaps with Sgr. For the bulge, we obtain μl cos b = -5.86 ± 0.14 and μb = -0.59 ± 0.14 mas yr-1, at l = 7.6° and b = -21.2°. The absolute proper motions are on the International Celestial Reference System via Hipparcos Catalog stars.

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