Fishing in tidal streams: new radial velocity and proper motion constraints on the orbit of the anticenter stream
Abstract
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 streamlike 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.
Additional Information
© 208 The American Astronomical Society. Received 2008 October 6; accepted 2008 October 30; published 2008 November 7. We are indebted to J. Munn for providing corrected SDSS USNO B proper motions in advance of the release of SDSS DR7. J. L. C. and S. R. M. acknowledge NSF grants AST-0307851 and AST-0807945.Attached Files
Published - Grillmair2008p418Astrophys_J_Lett.pdf
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Additional details
- Eprint ID
- 14142
- Resolver ID
- CaltechAUTHORS:20090504-102849828
- NSF
- AST-0307851
- NSF
- AST-0807945
- Created
-
2009-07-22Created from EPrint's datestamp field
- Updated
-
2021-11-08Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)