Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 16, Problem 11RQ
To determine
The reason for few quasars at low redshifts and at very high redshifts but many at redshifts between about
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Is a quasar with a redshift of z = 2 going faster than the speed of light? Why or why not?
What is the redshift of this quasar?
What evidence do we have that quasars are a few parsecs or smaller in size?
Chapter 16 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 16 - Prob. 1RQCh. 16 - Prob. 2RQCh. 16 - Prob. 3RQCh. 16 - Prob. 4RQCh. 16 - Prob. 5RQCh. 16 - Prob. 6RQCh. 16 - Prob. 7RQCh. 16 - Prob. 8RQCh. 16 - Prob. 9RQCh. 16 - Prob. 10RQ
Ch. 16 - Prob. 11RQCh. 16 - Prob. 12RQCh. 16 - How would you respond to someone who said, Oh,...Ch. 16 - Prob. 1PCh. 16 - Prob. 2PCh. 16 - Prob. 3PCh. 16 - Prob. 4PCh. 16 - Prob. 5PCh. 16 - Prob. 6PCh. 16 - Prob. 7PCh. 16 - Prob. 8PCh. 16 - Prob. 9PCh. 16 - Prob. 10PCh. 16 - Arrange the following in order of increasing size:...Ch. 16 - If the diameter of the Milky Way Galaxys visible...Ch. 16 - Prob. 1LTLCh. 16 - Prob. 2LTLCh. 16 - Prob. 3LTLCh. 16 - Prob. 4LTL
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- Why are quasars generally so much more luminous (why do they put out so much more energy) than active galaxies?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_forwardIf a quasar has a redshift of 3.3, at what fraction of the speed of light is it moving away from us?arrow_forward
- Describe the arguments supporting the idea that quasars are at the distances indicated by their redshifts.arrow_forwardWhat evidence do we have that the luminous central region of a quasar is small and compact?arrow_forwardThe Hydrogen Balmer line ?? has a wavelength of 486.1 nm. This wavelength is shifted to 563.9 nm in the spectrum of quasar 3C 273. Calculate how far is the quasar receding from us? (Hint: Use Doppler formula: ???=Δ??0; ?=3.00 ×105 ??/?).arrow_forward
- A Type la supernova explodes in a galaxy at a distance of 6.10×107 light-years from Earth. If astronomers detect the light from the supernova today, how many years T have passed since the supernova exploded? T= 2.07 x10 -5 years Given a Hubble constant of 74.3 km/s/Mpc, at what speed v is this galaxy moving away from Earth? v= km/s What is this galaxy's redshift? redshift:arrow_forwardRapid 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_forwardSuppose you observe a star-like object in the sky. How can you determine whether it is actually a star or a quasar?arrow_forward
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