What is the distance limit and does it depend on the size of the galaxy and on noise and interference from gas clouds and our own Milky Way?

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    $\begingroup$ Here's a report on finding rotation curves of galaxies at z=2~3 eso.org/sci/publications/messenger/archive/no.125-sep06/… It describes itself as "First convincing evidence for rotating discs at z ~ 2" and it also describes rotation in a gravitationally lensed galaxy at z=3.2 and finally notes that the ELT and JWST could make such observations routine. $\endgroup$
    – James K
    Commented Apr 16, 2023 at 14:54
  • $\begingroup$ The galaxies in that paper look really asymmetrical .Presumably they became more symmetrical with time. $\endgroup$
    – user50623
    Commented Apr 16, 2023 at 17:26
  • $\begingroup$ Thats an unintuitive conclusion. We'd expect to see more symetry rather than less symetry over distance. Plus on first principles I'd expect it to work the other way around with time smoothing out asymetry. $\endgroup$
    – Shayne
    Commented Apr 17, 2023 at 5:46


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