EBK LOOSE-LEAF VERSION OF UNIVERSE
11th Edition
ISBN: 9781319227975
Author: KAUFMANN
Publisher: VST
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Chapter 20, Problem 68Q
To determine
The speed of material that has moved away from the site of the supernova explosion over the past
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The difference in absolute magnitude between two objects is related to their fluxes by the flux-magnitude relation:
FA / FB = 2.51(MB - MA)
A distant galaxy contains a supernova with an absolute magnitude of -19. If this supernova were placed next to our Sun (M = +4.8) and you observed both of them from the same distance, how much more flux would the supernova emit than the Sun?
Fsupernova / FSun = ?
Consider the image above of the Cassiopeia A (Cas A) supernova remnant. The supernova explosion that caused this remnant was observed on earth about 300 years ago. It is about 3000 pc away. Since that time, the shockwave from the supernova has expanded to form the roughly spherical cloud pictured above. From the center point to the edge of the cloud is about 3 pc. Compute the angular diameter of the Cas A supernova remnant as viewed from Earth. Express your answer in arcminutes.
Models of the first star-forming clouds indicate that they had a
temperature of roughly 150 K and a particle density of roughly
400,000 particles per cubic centimeter at the time they started
trapping their internal thermal energy.
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Part A
Estimate the mass at which thermal pressure balances gravity for these values of pressure and temperature.
Express your answer in kilograms.
—| ΑΣΦ
Mcloud
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Part B
=
Mcloud
How does that mass compare with the Sun's mass?
Express your answer in solar masses.
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ΤΙ ΑΣΦ
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Chapter 20 Solutions
EBK LOOSE-LEAF VERSION OF UNIVERSE
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