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Title: Proper Motions of Stellar Streams Discovered in the Dark Energy Survey

Abstract

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 influence 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 affect on nearby streams, as well as global properties of the Milky Way's gravitational potential.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [1];  [6];  [1]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [8];  [8]; ORCiD logo; ORCiD logo [8]; ORCiD logo [9]
  1. Fermilab
  2. Princeton U., Astrophys. Sci. Dept.
  3. Texas A-M
  4. Surrey U.
  5. Chicago U., KICP
  6. Cambridge U., Inst. of Astron.
  7. Macquarie U.
  8. Sydney U.
  9. Carnegie Mellon U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1592136
Report Number(s):
arXiv:1907.09488; FERMILAB-PUB-19-655-AE-SCD
oai:inspirehep.net:1774634
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Astrophys.J.
Additional Journal Information:
Journal Volume: 885
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

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. Proper Motions of Stellar Streams Discovered in the Dark Energy Survey. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab44bf.
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., & Wang, M. Y. Proper Motions of Stellar Streams Discovered in the Dark Energy Survey. United States. doi:10.3847/1538-4357/ab44bf.
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. Thu . "Proper Motions of Stellar Streams Discovered in the Dark Energy Survey". United States. doi:10.3847/1538-4357/ab44bf. https://www.osti.gov/servlets/purl/1592136.
@article{osti_1592136,
title = {Proper Motions of Stellar Streams Discovered in the Dark Energy Survey},
author = {Shipp, N. and Li, T. S. and Pace, A. B. and Erkal, D. and Drlica-Wagner, A. and Yanny, B. and Belokurov, V. and Wester, W. and Koposov, S. E. and Kuehn, K. and Lewis, G. F. and Simpson, J. D. and Wan, Z. and Zucker, D. B. and Martell, S. L. and Wang, M. Y.},
abstractNote = {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 influence 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 affect on nearby streams, as well as global properties of the Milky Way's gravitational potential.},
doi = {10.3847/1538-4357/ab44bf},
journal = {Astrophys.J.},
number = ,
volume = 885,
place = {United States},
year = {2019},
month = {10}
}

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