Question

10. The radio galaxy 3C 79 has a redshift of z = 0:256. How far away...

10. The radio galaxy 3C 79 has a redshift of z = 0:256. How far away is it?

(a) 1000 Mpc

(b) 16 Mpc

(c) 2300 Mpc

(d) 130 Mpc

(e) 8100 Mpc

Science   Advanced-Physics   
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Homework Answers

Answer #1

We know the Hubble's law is given as,

Here. z = redshift of the object (here galaxy) = 0.256

c = speed of light = 3 x 108 m/s

H0 = Hubble's constant at present time = 70 km/s/Mpc = 70000 m/s/Mpc

d = distance to the galaxy

Putting the values we get,

This is the closest to the option (a) 1000 Mpc. The discrepancy is due to the fact that here most probably different value for H0 is considered. Now, if H0 is taken as 76.8 km/s/Mpc, then following the same procedure one will get the distance (d) to the galaxy as = 1000 Mpc.

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