Gaia astrometry plus spectroscopic catalogs yields the tightest constraints yet on extragalactic proper motion, reaching within a factor of 1.3 of the CMB dipole amplitude for nearby galaxies.
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Constraining Extragalactic Proper Motion with Gaia Astrometry
Gaia astrometry plus spectroscopic catalogs yields the tightest constraints yet on extragalactic proper motion, reaching within a factor of 1.3 of the CMB dipole amplitude for nearby galaxies.