Butterfly in a Cocoon, Understanding the Origin and Morphology of Globular Cluster Streams: The Case of GD-1

Malhan, Khyati; Ibata, Rodrigo A.; Carlberg, Raymond G.; Valluri, Monica; Freese, Katherine

doi:10.3847/1538-4357/ab2e07

Title: Butterfly in a Cocoon, Understanding the Origin and Morphology of Globular Cluster Streams: The Case of GD-1

Journal Article · 20 August 2019 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/ab2e07 · OSTI ID:1610970

^[1];

^[2];

^[3];

^[4]; Freese, Katherine ^[5]

Stockholm Univ. (Sweden)
Univ. de Strasbourg (France)
Univ. of Toronto, ON (Canada)
Univ. of Michigan, Ann Arbor, MI (United States)
Stockholm Univ. (Sweden); The Nordic Inst. for Theoretical Physics (NORDITA), Stockholm (Sweden); Univ. of Michigan, Ann Arbor, MI (United States)

Tidally disrupted globular cluster (GC) streams are usually observed, and therefore perceived, as narrow, linear, and one-dimensional structures in the 6D phase space. In this paper, 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 (~100 pc wide) around it, detected at the >5σ 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.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Swedish Research Council (VR); Oskar Klein Centre for Cosmoparticle Physics; Leinweber Center for Theoretical Physics; National Aeronautics and Space Administration (NASA); National Development and Reform Commission; Alfred P. Sloan Foundation; National Science Foundation (NSF)

Grant/Contract Number:: SC0007859; 638-2013-8993; NNX15AK79G

OSTI ID:: 1610970

Journal Information:: The Astrophysical Journal (Online), Vol. 881, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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