Proper Motions of Stellar Streams Discovered in the Dark Energy Survey

被引：46

作者：

Shipp, N. ^{[1
,2
,3
]}

Li, T. S. ^{[2
,3
,4
,5
]}

Pace, A. B. ^{[6
,7
]}

Erkal, D. ^{[8
]}

Drlica-Wagner, A. ^{[1
,2
,3
]}

Yanny, B. ^{[3
]}

Belokurov, V ^{[9
]}

Wester, W. ^{[3
]}

Koposov, S. E. ^{[9
,10
]}

Kuehn, K. ^{[11
,12
]}

Lewis, G. F. ^{[13
]}

Simpson, J. D. ^{[14
]}

Wan, Z. ^{[13
]}

Zucker, D. B. ^{[15
,16
]}

Martell, S. L. ^{[14
,17
]}

Wang, M. Y. ^{[18
]}

机构：

[1] Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 USA

[2] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[3] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA

[4] Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA

[5] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[6] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA

[7] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[8] Univ Surrey, Dept Phys, 12 BC 03, Guildford GU2 7XH, Surrey, England

[9] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[10] Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA

[11] Lowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA

[12] Macquarie Univ, Fac Sci & Engn, Australian Astron Opt, Macquarie Pk, NSW 2113, Australia

[13] Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia

[14] UNSW, Sch Phys, Sydney, NSW 2052, Australia

[15] Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia

[16] Macquarie Univ, Ctr Astron Astrophys & Astrophoton, Sydney, NSW 2109, Australia

[17] Ctr Excellence All Sky Astrophys Three Dimens AST, Sydney, NSW, Australia

[18] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15312 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 885卷 / 01期

关键词：

Stellar kinematics; Milky Way Galaxy; Milky Way stellar halo; Local Group; Galaxy structure; LARGE-MAGELLANIC-CLOUD; DIGITAL SKY SURVEY; MILKY-WAY; TIDAL STREAMS; OUTER HALO; EVOLUTION; CLUSTERS; DEBRIS; ORBITS; TAILS;

D O I：

10.3847/1538-4357/ab44bf

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We cross-match high-precision astrometric data from Gaia DR2 with accurate multiband 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 (LMC). These proper motions, when combined with radial velocity measurements, will allow for detailed orbit modeling that can be used to constrain properties of the LMC and its effect on nearby streams, as well as global properties of the Milky Way's gravitational potential.

引用

页数：18

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