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Simulating cosmological substructure in the solar neighbourhood

Simpson, Christine M; Gargiulo, Ignacio; Gómez, Facundo A; Grand, Robert JJ; Maffione, Nicolás; Cooper, Andrew P; Deason, Alis J; Frenk, Carlos; Helly, John; Marinacci, Federico; Pakmor, Rüdiger

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Christine M Simpson

Ignacio Gargiulo

Facundo A Gómez

Robert JJ Grand

Nicolás Maffione

Andrew P Cooper

John Helly

Federico Marinacci

Rüdiger Pakmor


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.


Simpson, C. M., Gargiulo, I., Gómez, F. A., Grand, R. J., Maffione, N., Cooper, A. P., …Pakmor, R. (2019). Simulating cosmological substructure in the solar neighbourhood. Monthly Notices of the Royal Astronomical Society: Letters, 490(1), L32-L37.

Journal Article Type Article
Acceptance Date Aug 23, 2019
Online Publication Date Sep 20, 2019
Publication Date Nov 30, 2019
Deposit Date Mar 11, 2020
Publicly Available Date Mar 11, 2020
Journal Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN 1745-3933
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 490
Issue 1
Pages L32-L37


Published Journal Article (2.2 Mb)

Copyright 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.

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