Absolute Proper Motion of the Sagittarius Dwarf Galaxy and of the Outer Regions of the Milky Way Bulge

Autor:	Terrence M. Girard, C. E. Lopez, Dana I. Dinescu, William F. van Altena
Rok vydání:	2004
Předmět:	Physics Stars Proper motion Space and Planetary Science Red giant Bulge Milky Way Astronomy Astronomy and Astrophysics Astrophysics Sagittarius Dwarf galaxy Dwarf spheroidal galaxy
Zdroj:	The Astrophysical Journal. 618:L25-L28
ISSN:	1538-4357 0004-637X
Popis:	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 = 76 and b = -212. The absolute proper motions are on the International Celestial Reference System via Hipparcos Catalog stars.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c61af82ff7f17f31ff61b17c17bc5e11 https://doi.org/10.1086/427731 Zobrazit plný text záznamu