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arxiv 2306.04837 v2 pith:JORC3DE2 submitted 2023-06-08 astro-ph.GA

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classification astro-ph.GA
keywords currentmagellanicgalaxiespassagesatellitesdistributionlargemilky
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We propose a scenario in which the Large Magellanic Cloud (LMC) is on its second passage around the Milky Way. Using a series of tailored N-body simulations, we demonstrate that such orbits are consistent with current observational constraints on the mass distribution and relative velocity of both galaxies. The previous pericentre passage of the LMC could have occurred 5-10 Gyr ago at a distance >~100 kpc, large enough to retain its current population of satellites. The perturbations of the Milky Way halo induced by the LMC look nearly identical to the first-passage scenario, however, the distribution of LMC debris is considerably broader in the second-passage model. We examine the likelihood of current and past association with the Magellanic system for dwarf galaxies in the Local Group, and find that in addition to 10-11 current LMC satellites, it could have brought a further 4-6 galaxies that have been lost after the first pericentre passage. In particular, four of the classical dwarfs - Carina, Draco, Fornax and Ursa Minor - each have a ~50% probability of once belonging to the Magellanic system, thus providing a possible explanation for the ``plane of satellites'' conundrum.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. LMC-induced Perturbations in the Milky Way Halo II: Bridging Field-level Inference and Summary-level Simulation-Based Inference

    astro-ph.GA 2026-07 conditional novelty 6.0

    A field-level flow-matching likelihood shows the raw 6D halo phase-space distribution carries 2.5-9.9x more MW-LMC parameter information than velocity moments; adding BFE+MOPED summaries recovers much of this gap.