TL;DR
This paper reviews methods and findings related to identifying stellar halo streams through kinematic analysis, highlighting the progress from early surveys to upcoming Gaia data that will enhance our understanding of the Galaxy's accretion history.
Contribution
It provides a comprehensive overview of the techniques used to detect halo streams and discusses how recent and future surveys will advance this field.
Findings
Detection of stellar streams in velocity space reveals galaxy formation history.
Progress from Hipparcos to Gaia enhances stream detection accuracy.
Ongoing surveys continue to discover new accretion relics.
Abstract
Clues to the origins and evolution of our Galaxy can be found in the kinematics of stars around us. Remnants of accreted satellite galaxies produce over- densities in velocity-space, which can remain coherent for much longer than spatial over-densities. This chapter reviews a number of studies that have hunted for these accretion relics, both in the nearby solar-neighborhood and the more-distant stellar halo. Many observational surveys have driven this field forwards, from early work with the Hipparcos mission, to contemporary surveys like RAVE & SDSS. This active field continues to flourish, providing many new discoveries, and will be revolutionised as the Gaia mission delivers precise proper motions for a billion stars in our Galaxy.
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