Phase-space correlation in stellar streams of the Milky Way halo: The clash of Kshir and GD-1. (arXiv:1911.00009v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Malhan_K/0/1/0/all/0/1">Khyati Malhan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ibata_R/0/1/0/all/0/1">Rodrigo A. Ibata</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Carlberg_R/0/1/0/all/0/1">Raymond G. Carlberg</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bellazzini_M/0/1/0/all/0/1">Michele Bellazzini</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Famaey_B/0/1/0/all/0/1">Benoit Famaey</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martin_N/0/1/0/all/0/1">Nicolas F. Martin</a>
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.
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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