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Measuring the Milky Way mass distribution in the presence of the LMC

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arxiv 2110.00018 v2 pith:5NCYMGXI submitted 2021-09-30 astro-ph.GA

Lilia Correa Magnus , Eugene Vasiliev This is my paper · ORCID
classification astro-ph.GA
keywords massdistributionsatelliteapproachclustersgalaxiesglobularmilky
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The ongoing interaction between the Milky Way (MW) and its largest satellite - the Large Magellanic Cloud (LMC) - creates a significant perturbation in the distribution and kinematics of distant halo stars, globular clusters and satellite galaxies, and leads to biases in MW mass estimates from these tracer populations. We present a method for compensating these perturbations for any choice of MW potential by computing the past trajectory of LMC and MW and then integrating the orbits of tracer objects back in time until the influence of the LMC is negligible, at which point the equilibrium approximation can be used with any standard dynamical modelling approach. We add this orbit-rewinding step to the mass estimation approach based on simultaneous fitting of the potential and the distribution function of tracers, and apply it to two datasets with the latest Gaia EDR3 measurements of 6d phase-space coordinates: globular clusters and satellite galaxies. We find that models with LMC mass in the range (1-2)x10^11 Msun better fit the observed distribution of tracers, and measure MW mass within 100 kpc to be (0.75+-0.1)x10^12 Msun, while neglecting the LMC perturbation increases it by ~15%.

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Cited by 2 Pith papers

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

  1. Variable gravitational potential of Milky Way analogues in HESTIA suite

    astro-ph.GA 2024-12 conditional novelty 6.0 of 10

    The gravitational potential of Milky Way analogues at large radii is significantly shaped by the Local Group environment, so orbit models must include it.

  2. Milky Way dynamics in light of Gaia

    astro-ph.GA 2025-01 accept novelty 3.0 of 10

    A review of Gaia-era Milky Way dynamics concludes that the disc is strongly out of equilibrium and that most recent evidence favors a long, slowly rotating bar, while the bar pattern speed and dark halo properties rem...

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