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Anisotropic satellite accretion on to the Local Group with HESTIA

Dupuy, A, Libeskind, NI, Hoffman, Y, Courtois, HM, Gottlöber, S, Grand, RJJ, Knebe, A, Sorce, JG, Tempel, E, Brent Tully, R, Vogelsberger, M and Wang, P (2022) Anisotropic satellite accretion on to the Local Group with HESTIA. Monthly Notices of the Royal Astronomical Society, 516 (3). pp. 4576-4584. ISSN 0035-8711

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How the cosmic web feeds haloes, and fuels galaxy formation is an open question with wide implications. This study explores the mass assembly in the Local Group (LG) within the context of the local cosmography by employing simulations whose initial conditions have been constrained to reproduce the local environment. The goal of this study is to inspect whether the direction of accretion of satellites on to the Milky Way and Andromeda galaxies is related to the cosmic web. The analysis considers the three high-resolution simulations available in the HESTIA simulation suite, as well as the derived velocity shear and tidal tensors. We notice two eras in the LG accretion history, delimited by an epoch around z ≈ 0.7. We also find that satellites can travel up to ∼4 Mpc, relative to their parent halo before crossing its viral radius R200. Finally, we observe a strong alignment of the infall direction with the axis of slowest collapse boldsymbol e3 of both tidal and shear tensors, implying satellites of the LG originated from one particular region of the cosmic web and were channeled towards us via the process of accretion.This alignment is dominated by the satellites that enter during the early infall era, i.e. z > 0.7.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
SWORD Depositor: A Symplectic
Date Deposited: 20 Apr 2023 11:57
Last Modified: 20 Apr 2023 11:57
DOI or ID number: 10.1093/mnras/stac2486
URI: https://researchonline.ljmu.ac.uk/id/eprint/19269
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