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Simulating cosmological substructure in the solar neighbourhood.

Simpson, Christine M. and Gargiulo, Ignacio and Gómez, Facundo A. and Grand, Robert J. J. and Maffione, Nicolás and Cooper, Andrew P. and Deason, Alis J. and Frenk, Carlos and Helly, John and Marinacci, Federico and Pakmor, Rüdiger (2019) 'Simulating cosmological substructure in the solar neighbourhood.', Monthly notices of the Royal Astronomical Society : letters., 490 (1). L32-L37.


We explore the predictive power of cosmological, hydrodynamical simulations for stellar phase-space substructure and velocity correlations with the AURIGA simulations and AURIGAIA mock Gaia catalogues. We show that at the solar circle the AURIGA simulations commonly host phase-space structures in the stellar component that have constant orbital energies and arise from accreted subhaloes. These structures can persist for a few Gyr, even after coherent streams in position space have been erased. We also explore velocity two-point correlation functions and find this diagnostic is not deterministic for particular clustering patterns in phase space. Finally, we explore these structure diagnostics with the AURIGAIA catalogues and show that current catalogues have the ability to recover some structures in phase space but careful consideration is required to separate physical structures from numerical structures arising from catalogue generation methods.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:23 August 2019
Date deposited:11 March 2020
Date of first online publication:20 September 2019
Date first made open access:11 March 2020

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