THE IMPRINTS OF THE GALACTIC BAR ON THE THICK DISK WITH RAVE

被引：19

作者：

Antoja, T. ^{[1
,2
]}

Monari, G. ^{[2
,3
]}

Helmi, A. ^{[2
]}

Bienayme, O. ^{[3
]}

Bland-Hawthorn, J. ^{[4
]}

Famaey, B. ^{[3
]}

Gibson, B. K. ^{[5
]}

Grebel, E. K. ^{[6
]}

Kordopatis, G. ^{[7
]}

Munari, U. ^{[8
]}

Navarro, J. ^{[9
]}

Parker, Q. ^{[10
,11
,12
]}

Reid, W. A. ^{[11
]}

Seabroke, G. ^{[13
]}

Steinmetz, M. ^{[7
]}

Zwitter, T. ^{[14
]}

机构：

[1] European Space Res & Technol Ctr ESA ESTEC, Directorate Sci & Robot Explorat, Sci Support Off, NL-2201 AZ Noordwijk, Netherlands

[2] Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands

[3] Univ Strasbourg, CNRS, UMR 7550, Observ Astron Strasbourg, F-67000 Strasbourg, France

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

[5] Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England

[6] Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, D-69120 Heidelberg, Germany

[7] Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany

[8] Osserv Astron Padova, INAF, I-36012 Asiago, VI, Italy

[9] Univ Victoria, Victoria, BC V8P 5C2, Canada

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

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

[12] Australian Astron Observ, N Ryde, NSW 1670, Australia

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

[14] Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 800卷 / 02期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 澳大利亚研究理事会; 瑞士国家科学基金会;

关键词：

Galaxy: disk; Galaxy: kinematics and dynamics; Galaxy: structure; VELOCITY EXPERIMENT RAVE; SOLAR NEIGHBORHOOD; LINDBLAD RESONANCE; LOCAL KINEMATICS; K-GIANTS; CATALOG; SUBSTRUCTURE; DISTANCES; EVOLUTION; ORIGIN;

D O I：

10.1088/2041-8205/800/2/L32

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the kinematics of a local sample of stars, located within a cylinder of 500 pc radius centered on the Sun, in the RAVE data set. We find clear asymmetries in the v(R) - v(phi) velocity distributions of thin and thick disk stars: there are more stars moving radially outward for low azimuthal velocities and more radially inward for high azimuthal velocities. Such asymmetries have been previously reported for the thin disk as being due to the Galactic bar, but this is the first time that the same type of structures are seen in the thick disk. Our findings imply that the velocities of thick-disk stars should no longer be described by Schwarzschild's, multivariate Gaussian or purely axisymmetric distributions. Furthermore, the nature of previously reported substructures in the thick disk needs to be revisited as these could be associated with dynamical resonances rather than to accretion events. It is clear that dynamical models of the Galaxy must fit the 3D velocity distributions of the disks, rather than the projected 1D, if we are to understand the Galaxy fully.

引用

页数：7

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