Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 21, Problem 46Q
To determine
The way in which astronomers identify the presence of black hole candidates in close binary systems when they are not sure whether these candidates are white dwarfs or neutron stars.
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An AGN is emitting with a luminosity of 2×1040W. The AGN's brightness varies by 10% on a time scale of 20 hours. Assuming that the size of the emitting region of the AGN is three Schwarzschild radii, choose which of the following values could give the mass of the central Black Hole, in solar masses.
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Chapter 21 Solutions
Universe: Stars And Galaxies
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