
Concept explainers
(a)
The speed at which the blazar is moving away from the Earth.

Answer to Problem 26Q
The speed at which the blazar is moving away from the Earth is
Explanation of Solution
Given:
The red shift of the given blazar is,
Formula used:
The expression for the ratio of the speed of the object moving away from the earth and
Here,
Calculation:
The speed of the blazar in moving away from the Earth is calculated as,
Solve further,
Conclusion:
The speed at which the blazar is moving away from the earth is
(b)
The time for which the fluctuation lasted for an astronomers within the blazar’s host galaxy.

Answer to Problem 26Q
The time for which the fluctuation lasted for an astronomer within the blazar’s host galaxy is
Explanation of Solution
Given:
The time span for which the fluctuation was seen on the earth is
Formula used:
The expression for the time dilation as per theory of relativity is given by,
Here,
Calculation:
The time for which the fluctuation lasted for an astronomer within the blazar’s host galaxy is calculated as,
Conclusion:
Therefore, the time for which the fluctuation lasted for an astronomer within the blazar’s host galaxy is
(c)
The maximum size of the region for emitting energy by the blazar.

Answer to Problem 26Q
The maximum size of the region for emitting energy by the blazar is
Explanation of Solution
Given:
The time for which the fluctuation lasted for an astronomer within the blazar’s host galaxy is
Formula used:
The size of the blazar is given by,
Here,
Calculation:
The maximum size of energy emitting region of the blazar is calculated as,
Solve further,
Conclusion:
The maximum size of the region for emitting energy by the blazar is
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Chapter 24 Solutions
Universe: Stars And Galaxies
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