UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 24, Problem 4CC
To determine
The consequences if a quasar temporarily becomes brighter without much change in its mass. Assume the initial luminosity of the quasar to be right at the Eddington limit.
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What is the mechanism for the energy output of quasars?
Describe a quasar.
Suppose a quasar is shining with a luminosity L. What is the approximate minimal mass of the black hole? (If the black hole had a lower mass than this, the pressure in the material would overcome the gravity of the black hole and the material would be blown apart.)
Give your answer in solar masses, in scientific notation to one significant figure (no decimal places).
Value:
L = 1*10^12 Lsun
Chapter 24 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
Ch. 24 - Prob. 1CCCh. 24 - Prob. 2CCCh. 24 - Prob. 3CCCh. 24 - Prob. 4CCCh. 24 - Prob. 5CCCh. 24 - Prob. 6CCCh. 24 - Prob. 7CCCh. 24 - Prob. 8CCCh. 24 - Prob. 9CCCh. 24 - Prob. 1CLC
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- If a quasar has a redshift of 3.3, at what fraction of the speed of light is it moving away from us?arrow_forwardIn the chapter, we discussed that the largest redshifts found so far are greater than 6. Suppose we find a quasar with a redshift of 6.1. With what fraction of the speed of light is it moving away from us?arrow_forwardWhy are quasars generally so much more luminous (why do they put out so much more energy) than active galaxies?arrow_forward
- What is the typical structure we observe in a quasar at radio frequencies?arrow_forwardSuppose you observe a star-like object in the sky. How can you determine whether it is actually a star or a quasar?arrow_forwardDescribe the process by which the action of a black hole can explain the energy radiated by quasars.arrow_forward
- Rapid variability in quasars indicates that the region in which the energy is generated must be small. You can show why this is true. Suppose, for example, that the region in which the energy is generated is a transparent sphere 1 light-year in diameter. Suppose that in 1 s this region brightens by a factor of 10 and remains bright for two years, after which it returns to its original luminosity. Draw its light curve (a graph of its brightness over time) as viewed from Earth.arrow_forwardThe quasar that appears the brightest in our sky, 3C 273, is located at a distance of 2.4 billion lightyears. The Sun would have to be viewed from a distance of 1300 light-years to have the same apparent magnitude as 3C 273. Using the inverse square law for light, estimate the luminosity of 3C 273 in solar units.arrow_forwardDescribe some differences between quasars and normal galaxies.arrow_forward
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