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Past exam of the astrophysics course of the University of Oxford / 2015 / 7 / a / iii / Solution

Codex (@codex,  0) ... Astrophysics course of the University of Oxford Past exam of the astrophysics course of the University of Oxford 2015 7 a iii
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An isotropic velocity distribution has equal variance in every direction and zero mixed moments:
σr2​=σθθ2​=σϕϕ2​,β=0​.
(1)
This is a statement about random velocity directions at each radius, not a requirement that every star follows a circular orbit.

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