Radial distribution of stellar motions in Gaia DR2

被引：92

作者：

Kawata, Daisuke ^{[1
]}

Baba, Junichi ^{[2
]}

Ciuca, Ioana ^{[1
]}

Cropper, Mark ^{[1
]}

Grand, Robert J. J. ^{[3
,4
]}

Hunt, Jason A. S. ^{[5
]}

Seabroke, George ^{[1
]}

机构：

[1] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

[2] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

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

[4] Univ Tokyo, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[5] Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S 3H4, Canada

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 479卷 / 01期

关键词：

Galaxy: disc; Galaxy: evolution; Galaxy: kinematics and dynamics; OUTER LINDBLAD RESONANCE; SPIRAL ARMS; WAVES; STARS; BAR; KINEMATICS; SIGNATURES; DYNAMICS;

D O I：

10.1093/mnrasl/sly107

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

By taking advantage of the superbmeasurements of position and velocity for an unprecedented large number of stars provided in Gaia DR2, we have generated the first maps of the rotation velocity, V-rot, and vertical velocity, V-z, distributions as a function of the Galactocentric radius, R-gal, across a radial range of 5 < R-gal < 12 kpc. In the R - V-rot map, we have identified many diagonal ridge features, which are compared with the location of the spiral arms and the expected outer Lindblad resonance of the Galactic bar. We have detected also radial wave-like oscillations of the peak of the vertical velocity distribution.

引用

页码：L108 / L112

页数：5

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