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Unformatted text preview: and , respectively. You are to assume a Plummer model for the Galctic gravitational potential. Find the Plummer parameter a from the observed values of the Oort A and B constants, A = 15 km s1 kpc1 , B =12 km s1 kpc1 , assuming the Galactocentric distance of the Sun is R = 8 . 5 kpc and its circular velocity is V = 220 km s1 . Also determine the total mass of the Galaxy and the fraction which is interior to the solar circle. Explain the ratio / that you nd....
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 Spring '11
 Lattimer
 Galaxies

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