Piercing the Milky Way: an all-sky view of the Orphan Stream

被引：101

作者：

Koposov, S. E. ^{[1
,2
]}

Belokurov, V. ^{[2
,3
]}

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

Mateu, C. ^{[6
]}

Erkal, D. ^{[7
]}

Grillmair, C. J. ^{[8
]}

Hendel, D. ^{[9
]}

Price-Whelan, A. M. ^{[10
]}

Laporte, C. F. P. ^{[11
]}

Hawkins, K. ^{[12
]}

Sohn, S. T. ^{[13
]}

del Pino, A. ^{[13
]}

Evans, N. W. ^{[2
]}

Slater, C. T. ^{[14
]}

Kallivayalil, N. ^{[15
]}

Navarro, J. F. ^{[16
]}

机构：

[1] Carnegie Mellon Univ, 5000 Forbes Ave, Pittsburgh, PA 15213 USA

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

[3] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 USA

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

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

[6] Univ Republica, Inst Fis, Dept Astron, Igua 4225, Montevideo 11400, Uruguay

[7] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

[8] CALTECH, IPAC, Mail Code 314-6,1200 E Calif Blvd, Pasadena, CA 91125 USA

[9] Univ Toronto, Dept Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada

[10] Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA

[11] Univ Victoria, Dept Phys & Astorn, 3800 Finnerty Rd, Victoria, BC V8P 5C2, Canada

[12] Univ Texas Austin, Dept Astron, 2515 Speedway Blvd, Austin, TX 78712 USA

[13] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[14] Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA

[15] Univ Virginia, Dept Astron, 530 McCormick Rd, Charlottesville, VA 22904 USA

[16] Univ Victoria, Dept Phys & Astron, 3800 Finnerty Rd, Victoria, BC V8P 5C2, Canada

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 485卷 / 04期

基金：

英国科学技术设施理事会; 美国国家科学基金会; 美国国家航空航天局; 欧洲研究理事会;

关键词：

Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: structure; galaxies: dwarf; galaxies: structure; HORIZONTAL-BRANCH STARS; COLD STELLAR STREAM; TIDAL STREAMS; GALACTIC HALO; DWARF GALAXY; DEBRIS; SAGITTARIUS; SEGUE; FIELD; MASS;

D O I：

10.1093/mnras/stz457

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use astrometry, broad-band photometry, and variability information from the Data Release 2 of ESA's Gaia mission (GDR2) to identify members of the Orphan Stream (OS) across the whole sky. The stream is traced above and below the celestial equator and in both Galactic hemispheres, thus increasing its visible length to similar to 210 degrees equivalent to similar to 150 kpc in physical extent. Taking advantage of the large number of RR Lyrae stars in the OS, we extract accurate distances and proper motions across the entire stretch of the tidal debris studied. As delineated by the GDR2 RR Lyrae, the stream exhibits two prominent twists in its shape on the sky which are accompanied by changes in the tangential motion. We complement the RR Lyrae maps with those created using GDR2 Red Giants and the DECam Legacy Survey Main Sequence Turn-Off stars. The behaviour of the OS track on the sky is consistent across all three tracers employed. We detect a strong non-zero motion in the across-stream direction for a substantial portion of the stream. Such a misalignment between the debris track and the streaming velocity cannot be reproduced in a static gravitational potential and signals an interaction with a massive perturber.

引用

页码：4726 / 4742

页数：17

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