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Phase-space Correlation in Stellar Streams of the Milky Way Halo: The Clash of Kshir and GD-1
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 62019 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 886, no 1, article id L7Article in journal (Refereed) Published
Abstract [en]

We report the discovery of a <CDATA<i 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.

Place, publisher, year, edition, pages
2019. Vol. 886, no 1, article id L7
Keywords [en]
Globular star clusters, Dark matter, Stellar kinematics, Milky Way stellar halo
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-177488DOI: 10.3847/2041-8213/ab530eISI: 000499340300001OAI: oai:DiVA.org:su-177488DiVA, id: diva2:1385898
Available from: 2020-01-15 Created: 2020-01-15 Last updated: 2020-01-15Bibliographically approved

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Malhan, KhyatiIbata, Rodrigo A.Carlberg, Raymond G.
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