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Lateral motion

michel123456
in Astronomy and Cosmology

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When observing galaxies, astronomers are able to measure their relative velocity to us.

How do they measure the eventual lateral velocity when the galaxy motion is not directly aligned with us?

When observing galaxies, astronomers are able to measure their relative velocity to us.

How do they measure the eventual lateral velocity when the galaxy motion is not directly aligned with us?

 

Outside our Virgo Supercluster there is hardly any lateral motion. All other superclusters are moving away from us. I suppose the method they use to measure galactic rotation could also be used to measure lateral motion of galaxies within our supercluster. Anyone know how they measure galactic rotation speed?

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Outside our Virgo Supercluster there is hardly any lateral motion. All other superclusters are moving away from us. I suppose the method they use to measure galactic rotation could also be used to measure lateral motion of galaxies within our supercluster. Anyone know how they measure galactic rotation speed?

 

That is exactly my question: how do we know that? How do astronomers measure lateral motion?

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