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PHASE-SPACE CORRELATION IN STELLAR STREAMS OF THE MILKY WAY HALO: THE CLASH OF KSHIR AND AND GD-1

Abstract : We report the discovery of a 70 • 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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Submitted on : Sunday, November 1, 2020 - 3:58:59 PM
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Khyati Malhan, Rodrigo Ibata, Raymond Carlberg, Michele Bellazzini, Benoit Famaey, et al.. PHASE-SPACE CORRELATION IN STELLAR STREAMS OF THE MILKY WAY HALO: THE CLASH OF KSHIR AND AND GD-1. The Astrophysical journal letters, Bristol : IOP Publishing, 2019, 886 (1), pp.L7. ⟨10.3847/2041-8213/ab530e⟩. ⟨hal-02984950⟩

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