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Proper Motions of Stellar Streams Discovered in the Dark Energy Survey

Shipp, N., Li, T. S., Pace, A. B., Erkal, D., Drlica-Wagner, A., Yanny, B., Belokurov, V., Wester, W., Koposov, S. E., Kuehn, K. , Lewis, G. F., Simpson, J. D., Wan, Z., Zucker, D. B., Martell, S. L. and Wang, M. Y. (2019) Proper Motions of Stellar Streams Discovered in the Dark Energy Survey The Astrophysical Journal, 885 (3).

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We cross-match high-precision astrometric data from Gaia DR2 with accurate multi-band photometry from the Dark Energy Survey (DES) DR1 to confidently measure proper motions for nine stellar streams in the DES footprint: Aliqa Uma, ATLAS, Chenab, Elqui, Indus, Jhelum, Phoenix, Tucana III, and Turranburra. We determine low-confidence proper motion measurements for four additional stellar streams: Ravi, Wambelong, Willka Yaku, and Turbio. We find evidence for a misalignment between stream tracks and the systemic proper motion of streams that may suggest a systematic gravitational in uence from the Large Magellanic Cloud. These proper motions, when combined with radial velocity measurements, will allow for detailed orbit modeling which can be used to constrain properties of the LMC and its on nearby streams, as well as global properties of the Milky Way's gravitational potential.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Shipp, N.
Li, T. S.
Pace, A. B.
Drlica-Wagner, A.
Yanny, B.
Belokurov, V.
Wester, W.
Koposov, S. E.
Kuehn, K.
Lewis, G. F.
Simpson, J. D.
Wan, Z.
Zucker, D. B.
Martell, S. L.
Wang, M. Y.
Date : 1 November 2019
DOI : 10.3847/1538-4357/ab44bf
Copyright Disclaimer : © 2019. The American Astronomical Society. All rights reserved.
Uncontrolled Keywords : Stars: kinematics and dynamics; Galaxy: structure; Galaxy: halo; Local Group
Depositing User : Diane Maxfield
Date Deposited : 13 Jan 2020 13:43
Last Modified : 13 Jan 2020 13:43

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