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The Origin of Kinematically Persistent Planes of Satellites as Driven by the Early Evolution of the Cosmic Web in ΛCDM

Gámez-Marín, Matías; Santos-Santos, Isabel; Domínguez-Tenreiro, Rosa; Pedrosa, Susana E.; Tissera, Patricia B.; Gómez-Flechoso, M. Ángeles; Artal, Héctor

The Origin of Kinematically Persistent Planes of Satellites as Driven by the Early Evolution of the Cosmic Web in ΛCDM Thumbnail


Authors

Matías Gámez-Marín

Rosa Domínguez-Tenreiro

Susana E. Pedrosa

Patricia B. Tissera

M. Ángeles Gómez-Flechoso

Héctor Artal



Abstract

Kinematically persistent planes (KPPs) of satellites are fixed sets of satellites co-orbiting around their host galaxy, whose orbital poles are conserved and clustered across long cosmic time intervals. They play the role of “skeletons,” ensuring the long-term durability of positional planes. We explore the physical processes behind their formation in terms of the dynamics of the local cosmic web (CW), characterized via the so-called Lagrangian volumes (LVs) built up around two zoom-in, cosmological hydro-simulations of Milky Way–mass disk galaxy + satellites systems, where three KPPs have been identified. By analyzing the LV deformations in terms of the reduced tensor of inertia (TOI), we find an outstanding alignment between the LV principal directions and the KPP satellites’ orbital poles. The most compressive local mass flows (along the eˆ3 eigenvector) are strong at early times, feeding the so-called eˆ3 -structure, while the smallest TOI axis rapidly decreases. The eˆ3 -structure collapse marks the end of this regime and is the timescale for the establishment of satellite orbital pole clustering when the Universe is ≲4 Gyr old. KPP protosatellites aligned with eˆ3 are those whose orbital poles are either aligned from early times or have been successfully bent at eˆ3 -structure collapse. KPP satellites associated with eˆ1 tend to have early trajectories already parallel to eˆ3 . We show that KPPs can arise as a result of the ΛCDM-predicted large-scale dynamics acting on particular sets of protosatellites, the same dynamics that shape the local CW environment.

Citation

Gámez-Marín, M., Santos-Santos, I., Domínguez-Tenreiro, R., Pedrosa, S. E., Tissera, P. B., Gómez-Flechoso, M. Á., & Artal, H. (2024). The Origin of Kinematically Persistent Planes of Satellites as Driven by the Early Evolution of the Cosmic Web in ΛCDM. Astrophysical Journal, 965(2), Article 154. https://doi.org/10.3847/1538-4357/ad27da

Journal Article Type Article
Acceptance Date Feb 2, 2024
Online Publication Date Apr 16, 2024
Publication Date Apr 1, 2024
Deposit Date May 14, 2024
Publicly Available Date May 14, 2024
Journal The Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 965
Issue 2
Article Number 154
DOI https://doi.org/10.3847/1538-4357/ad27da
Public URL https://durham-repository.worktribe.com/output/2392489

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