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Butterfly in a Cocoon, Understanding the Origin and Morphology of Globular Cluster Streams: The Case of 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: 52019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 881, no 2, article id 106Article in journal (Refereed) Published
Abstract [en]

Tidally disrupted globular cluster (GC) streams are usually observed, and therefore perceived, as narrow, linear, and one-dimensional structures in the 6D phase space. Here, we show that the GD-1 stellar stream, which is the tidal debris of a disrupted GC, possesses a secondary diffuse and extended stellar component (similar to 100 pc wide) around it, detected at the >5 sigma confidence level. Similar morphological properties are seen in synthetic streams that are produced from star clusters that are formed within dark matter sub-halos and then accrete onto a massive host galaxy. This lends credence to the idea that the progenitor of the highly retrograde GD-1 stream was originally formed outside of the Milky Way in a now defunct dark satellite galaxy. We deem that in future studies, this newly found cocoon component may serve as a structural hallmark to distinguish between the in situ and ex situ (accreted) formed GC streams.

Place, publisher, year, edition, pages
2019. Vol. 881, no 2, article id 106
Keywords [en]
Galaxy: formation, Galaxy: halo, Galaxy: structure, globular clusters: general, stars: kinematics and dynamics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-173136DOI: 10.3847/1538-4357/ab2e07ISI: 000482006100005OAI: oai:DiVA.org:su-173136DiVA, id: diva2:1356790
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved

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Malhan, KhyatiIbata, Rodrigo A.Freese, Katherine
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Nordic Institute for Theoretical Physics (Nordita)
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