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Title:
Inferring the dynamics of stellar streams via distance gradients
Authors:
Jin, Shoko; Martin, Nicolas F.
Affiliation:
AA(Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, D-69120, Heidelberg, Germany), AB(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 400, Issue 1, pp. L43-L46. (MNRAS Homepage)
Publication Date:
11/2009
Origin:
MNRAS
Astronomy Keywords:
methods: analytical , Galaxy: kinematics and dynamics
DOI:
10.1111/j.1745-3933.2009.00759.x
Bibliographic Code:
2009MNRAS.400L..43J

Abstract

We present a simple result in which the distance gradient along a stream can be used to derive the transverse velocity (i.e. proper motion) along it, if the line-of-sight velocity is also known. We show its application to a mock orbit to illustrate its validity and usage. For less extended objects, such as globular clusters and satellite galaxies being tidally disrupted, the same result can be applied in its small-angle approximation. The procedure does not rely on energy or angular momentum conservation and hence does not require a Galactic model in order to deduce the local velocity vector of the stream.
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