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

  • Thread starter aniketp
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  • #1
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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...
 

Answers and Replies

  • #2
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You can't.
 
  • #3
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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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