1 answer

For each of the following distances, if a galaxy the size of the Milky Way (about...

Question:

For each of the following distances, if a galaxy the size of the Milky Way (about 29.9 kpc in diameter) were at that distance

For each of the following distances, if a galaxy the size of the Milky Way (about 29.9 kpc in diameter) were at that distance from the Milky Way, what would its angular size appear to be? a. 10.8 Mpc a-Γ arc minutes b. 1041 Mpc a-Γ arc minutes

Answers

a)

Given data,

L = 29.9 kpc

d = 10.8  Mpc

= 10.8 x 103 kpc

Angular diameter A = ( L/ d) x 57.30

= (29.9 kpc / 10.8 x103 kpc) x 57.30

                                      = 0.15860

Angular diameter A = 0.15860 x 60

= 9.518 arc minutes

b)

Given d = 1041 Mpc

= 1041 x 103 kpc

Angular diameter A =( L / d) x 57.30

= (29.9 kpc / 1041 x 103 kpc) x  57.30

                                      = 0.001640

Angular diameter A = 0.001640 x 60

= 0.0986 arc minutes

.

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