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A Magellanic origin for the Virgo substructure

Boubert, D, Belokurov, V, Erkal, Denis and Iorio, G (2018) A Magellanic origin for the Virgo substructure Monthly Notices of the Royal Astronomical Society, sty3014.

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The Milky Way halo has been mapped out in recent work using a sample of RR Lyrae stars drawn from a cross-match of Gaia with 2MASS. We investigate the significant residual in this map which we constrain to lie at Galactocentric radii 12 < R < 27 kpc and extend over 2600 deg2 of the sky. A counterpart of this structure exists in both the Catalina Real Time Survey and the sample of RR Lyrae variables identified in Pan-STARRS, demonstrating that this structure is not caused by the spatial inhomogeneity of Gaia. The structure is likely the Virgo Stellar Stream and/or Virgo Over-Density. We show the structure is aligned with the Magellanic Stream and suggest that it is either debris from a disrupted dwarf galaxy that was a member of the Vast Polar Structure or that it is SMC debris from a tidal interaction of the SMC and LMC 3 Gyr ago. If the latter then the sub-structure in Virgo may have a Magellanic origin.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Boubert, D
Belokurov, V
Iorio, G
Date : 10 November 2018
Funders : STFC; European Union's Seventh Framework Programme
DOI : 10.1093/mnras/sty3014
Copyright Disclaimer : © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (
Uncontrolled Keywords : stars: variables: RR Lyrae, Galaxy: halo, Galaxy: structure, Magellanic Clouds
Depositing User : Melanie Hughes
Date Deposited : 23 Nov 2018 13:15
Last Modified : 11 Dec 2018 11:24

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