Inferring the dynamics of stellar streams via distance gradients

TL;DR

This paper introduces a straightforward method to determine the transverse velocity of stellar streams using their distance gradients and line-of-sight velocities, applicable to both extended streams and smaller objects.

Contribution

It presents a novel, model-independent technique to infer the local velocity vector of stellar streams from observable quantities.

Findings

Validates the method using a mock orbit.

Applicable to both extended streams and small objects.

Does not require a Galactic model.

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.