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Extragalactic Proper Motions: Gravitational Waves and Cosmology

Published onMay 31, 2019
Extragalactic Proper Motions: Gravitational Waves and Cosmology
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Abstract

We review the cosmological and local phenomena revealed by correlated extragalactic proper motions, their expected amplitudes, the current best measurements (if any), and predictions for Gaia. We describe key ground- and space-based observational requirements to measure or constrain these proper motion signals at the level of 100 nanoarcsec/year.

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