期刊
ASTROPHYSICAL JOURNAL
卷 594, 期 2, 页码 L119-L122出版社
UNIV CHICAGO PRESS
DOI: 10.1086/378767
关键词
galaxies : interactions; Galaxy : disk; Galaxy : structure
To determine the nature of the recently discovered, ringlike stellar structure at the Galactic anticenter, we have collected spectra of a set of presumed constituent M giants selected from the Two Micron All Sky Survey Point Source Catalog. Radial velocities have been obtained for stars spanning similar to100degrees, exhibiting a trend in velocity with Galactic longitude and an estimated dispersion of sigma(v) = 20 +/- 4 km s(-1). A mean metallicity [Fe/H] = -0.4 +/- 0.3 measured for these stars combines with previous evidence from the literature to suggest a population with a significant metallicity spread. In addition, a curious alignment of at least four globular clusters of lower mean metallicity is noted to be spatially and kinematically consistent with this stellar distribution. We interpret the M giant sample position and velocity variation with Galactic longitude as suggestive of a satellite galaxy currently undergoing tidal disruption in a noncircular, prograde orbit about the Milky Way.
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