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5. (10 points) The quasar 3C273 has a luminosity of 2 x 1039 W. Assuming that 10% of the mass that falls onto the

5. (10 points) The quasar 3C273 has a luminosity of 2 x 1039 W. Assuming that 10% of the mass that falls onto the accretion disk is converted into luminosity, how fast is 3C273 accreting gas? Give your answer in units of Moun/year.

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