
Concept explainers
(a)
The distance to M51 in megaparsecs (Mpc), if the distance modulus of galaxy M51 is
(a)

Answer to Problem 7Q
Solution:
Explanation of Solution
Given data:
The difference between the apparent magnitude and absolute magnitude is given by the folloing expression.
Formula used:
Apparent magnitude (m) is related to absolute magnitude (M) and the distance to the galaxy (d) in parsecs, by the following equation.
Explanation:
Now recall the formula of apparent magnitude and absolute magnitude.
Use the following equation.
Compairing equation (1) and (2),
Solve further.
Conclusion:
The distance to M51 is
(b)
The the distance to M51 in megaparsecs (Mpc), if the distance modulus of galaxy M51 is
(b)

Answer to Problem 7Q
Solution:
Explanation of Solution
Given data:
The difference between the apparent magnitude and absolute magnitude is 29.6.
Formula used:
Apparent magnitude (m) is related to absolute magnitude (M) and the distance to the galaxy (d) in parsecs by the following relation.
Explanation:
Recall the formula of apparent magnitude and absolute magnitude.
It is given that,
Comparing equation (3) and (4),
Solve further.
Conclusion:
The distance to M51 is
(c)
The difference between the distances to M51, when the different values of
(c)

Answer to Problem 7Q
Solution:
The difference is
Explanation of Solution
Introduction:
Andromeda Galaxy: This is the spiral galaxy of the distance 2.5 million ly from the Earth and it is a major galaxy, nearest to the milky way. It is also known as Messier 32 or M31.
Explanation:
Obtain the values of distance to galaxies from the above parts with respect to the two different values of
Therefore, the distance value for
The difference is given blow.
Conclusion:
From the calculation, it is observed that the difference is
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Chapter 23 Solutions
Universe
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