Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-12
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, 2 tables. Accepted for publication in ApJ Letters
Scientific paper
10.1086/595973
We have obtained radial velocity measurements for stars in two, widely-separated fields in the Anticenter Stream. Combined with SDSS/USNO-B proper motions, the new measurements allow us to establish that the stream is on a nearly circular, somewhat inclined, prograde orbit around the Galaxy. While the orbital eccentricity is similar to that previously determined for the Monoceros stream, the sizes, inclinations, and positions of the orbits for the two systems differ significantly. Integrating our best fitting Anticenter Stream orbit forward, we find that it is closely aligned along and lies almost on top of a stream-like feature previously designated the "Eastern Banded Structure". The position of this feature coincides with the apogalacticon of the orbit. We tentatively conclude that this feature is the next wrap of the Anticenter Stream.
Carlin Jeffrey L.
Grillmair Carl J.
Majewski Steven R.
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