UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 25, Problem 14CC
To determine
The assumption that must be considered about Type Ia supernovae to use them for measuring distances to galaxies.
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A galaxy at redshift z has an infrared luminosity of LIR. What is the approximate star formation rate of the galaxy? Express your answer in solar masses per year, rounding to the nearest integer.
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Estimate the age of the universe for a Hubble constant of (a)50km/s/Mpc, (b) 75km/s/Mpc, and (c) 100 km/s/Mpc. On the basis of the answers, explain how the ages of globular clusters could be used to put a limit on the maximum value of the Hubble constant.
Chapter 25 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
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- What is the most useful standard bulb method for determining distances to galaxies?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_forwardUsing the information from Example 28.1, if galaxies are distributed homogeneously, how many times more of them would you expect to count on your second survey?arrow_forward
- What are the two best ways to measure the distance to a distant, isolated spiral galaxy, and how would it be measured?arrow_forwardWhat are the two best ways to measure the distance to a nearby spiral galaxy, and how would it be measured?arrow_forwardHow do we know there are supermassive black holes driving active galaxies? a. The cores fluctuate over short periods of time, suggesting a small size. b. The gas near the core is moving very rapidly, suggesting high mass. c. The spectra are dominantly in the Balmer region, suggesting they are made of hydrogen. d. both a and b e. both a and carrow_forward
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