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How to measure the tangential component of velocity of receding starsor quasars?

  1. Jun 17, 2008 #1
    Hi all,
    How to measure the tangential component of velocity of receding starsor quasars?
    I ask this because i think the velocity determined by observing the red shift will give only the radial component...won't
    Thnx for replying...
     
  2. jcsd
  3. Jun 30, 2008 #2
    You can't.
     
  4. Jul 9, 2008 #3
    For stars their proper motion (not just radial) can be measured a few ways. If they move fast enough, comparing images from different epochs and looking for a change in position works. Interferometry, if high enough resolution, can also be used to measure the proper motion of stars. As for Quasars, I would say with current technology it's virtually impossible as they are much much too far away.
     
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