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Phase-space correlation in stellar streams of the Milky Way halo: The clash of Kshir and GD-1

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arxiv 1911.00009 v1 pith:C5VBRN4Y submitted 2019-10-31 astro-ph.GA

Khyati Malhan , Rodrigo A. Ibata , Raymond G. Carlberg , Michele Bellazzini , Benoit Famaey , Nicolas F. Martin This is my paper · ORCID
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keywords gd-1milkystellarhalokshirphase-spacestreamstreams
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We report the discovery of a 70-degree long stellar stream in the Milky Way halo, which criss-crosses the well known "GD-1" stream. We show that this new stellar structure ("Kshir") and GD-1 lie at similar distance, and are remarkably correlated in kinematics. We propose several explanations for the nature of this new structure and its possible association with GD-1. However, a scenario in which these two streams were accreted onto the Milky Way within the same dark matter sub-halo seems to provide a natural explanation for their phase-space entanglement, and other complexities of this coupled-system.

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