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 52Q
To determine
The way, the observation of Long gamma-ray bursts in the galaxy where there is ongoing star formation, is consistent with the Collapsar model of the way these bursts occur.
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If a quasar has a recessional velocity of 2.7 × 10 5 km/sec and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone?
a.
50 km/sec/Mpc
b.
9.7 × 108 km/sec/Mpc
c.
75 km/sec/Mpc
d.
0.013 km/sec/Mpc
e.
273,600 km/sec/Mpc
If a galaxy moving away from the Earth has a speed of 1000 km/s and emits 656 nm light characteristic of hydrogen (the most common element in the universe). Why is the speed of the Earth in its orbit negligible here?
Chapter 21 Solutions
Universe: Stars And Galaxies
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- Describe the arguments supporting the idea that quasars are at the distances indicated by their redshifts.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_forwardWhy were quasars and active galaxies not initially recognized as being “special” in some way?arrow_forward
- Describe some differences between quasars and normal 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_forwardWhat is the most useful standard bulb method for determining distances to galaxies?arrow_forward
- Suppose you were Hubble and Humason, working on the distances and Doppler shifts of the galaxies. What sorts of things would you have to do to convince yourself (and others) that the relationship you were seeing between the two quantities was a real feature of the behavior of the universe? (For example, would data from two galaxies be enough to demonstrate Hubble’s law? Would data from just the nearest galaxies-in what astronomers call “the Local Group”-suffice?)arrow_forwardWhy can we not determine distances to galaxies by the same method used to measure the parallaxes of stars?arrow_forwardUsing the information from Example 28.1, how much fainter an object will you have to be able to measure in order to include the same kinds of galaxies in your second survey? Remember that the brightness of an object varies as the inverse square of the distance.arrow_forward
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