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The Proper Motion of the Large Magellanic Cloud using HST

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arxiv astro-ph/0508457 v1 pith:VFDAC7XU submitted 2005-08-22 astro-ph

The Proper Motion of the Large Magellanic Cloud using HST

Nitya Kallivayalil (CfA) , Roeland P. van der Marel (STScI) , Charles Alcock (CfA) , Tim Axelrod (Steward Observatory) , Kem H. Cook (LLNL) , A.J. Drake (Caltech) , M. Geha (Carnegie Observatories) This is my paper
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keywords motionpropermagellaniccameraclouddatalargemeasurement
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We present a measurement of the systemic proper motion of the Large Magellanic Cloud (LMC) from astrometry with the High Resolution Camera (HRC) of the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST). We observed LMC fields centered on 21 background QSOs that were discovered from their optical variability in the MACHO database. The QSOs are distributed homogeneously behind the central few degrees of the LMC. With 2 epochs of HRC data and a ~2 year baseline we determine the proper motion of the LMC to better than 5% accuracy: mu_W = -2.03 +/- 0.08 mas/yr; mu_N = 0.44 +/- 0.05 mas/yr. This is the most accurate proper motion measurement for any Milky Way satellite thus far. When combined with HI data from the Magellanic Stream this should provide new constraints on both the mass distribution of the Galactic Halo and models of the Stream.

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Cited by 2 Pith papers

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  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.

  2. The VMC survey -- LV. The coherent expansion of the SMC

    astro-ph.GA 2026-06 unverdicted novelty 4.0

    Improved VMC proper motions show SMC expansion along SE-NW axes consistent with LMC tides, radial inward motions with no rotation, and northward motion in older RGB stars from a prior interaction.