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We observe an elliptical galaxy with a total mass =10¹²⊙. and a line-of-sight velocity dispersion of 200m.
(a) Given that the total K-band luminosity of the galaxy is =5×10¹⁰⊙., what is the mass of its dark matter halo? (assuming a reasonable mass-to-light ratio for the stars in the galaxy).

Sagot :

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