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Keith Smith
drkeithsmith.bsky.social
did:plc:wxe224kl2yklhrpj2friwiue
Not quite what I was thinking of (which was HVCs in radio), but section 4.4 of this paper ascribes variable optical absorption lines in quasar spectra to the motion of the Sun relative to the Milky Way ISM - which is just the inverse of the ISM proper motion.
https://www.aanda.org/articles/aa/full_html/2015/09/aa26289-15/aa26289-15.html
2025-09-08T15:58:30.005Z