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I have data from a simulation of galaxies with various properties and I want to retrieve the peculiar velocity. If we want to relate with real galaxy surveys, what we can measure from real data is the radial peculiar velocity.

My question is, since we have a simulation i imagine we can measure the perpendicular velocity, but how?? Is there an equation which relates the perpendicular velocity of galaxies with other properties (i.e. the radial velocity)

P.S : to calculate the radial velocity I had the redshift of each galaxy with and without peculiar velocities.

Cheers

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# Perpendicular peculiar velocity

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