Question
What is the redshift of a galaxy which lies at a distance of 50 mpc, asssuming that the hubble constant is H_0 = 67 km s^-1 Mpc^-1?
assume that the speed of light is c=3.0x10^5 Km s^-1 please answer to an accuracy of 2 sig figs. Thankyou.
assume that the speed of light is c=3.0x10^5 Km s^-1 please answer to an accuracy of 2 sig figs. Thankyou.
Answers
drwls
First get the speed of the galaxy away from the observer by multiplyiing distance by the Hubble constant. This will give you the velocity in km/s.
V = 50 Mpc *(67 km/s)/Mpc = 3350 km/s
The RELATIVE redshift is
(deltaL)/L = V/c
The absolute redshift, delta L, depends upon the wavelength you are observing.
V = 50 Mpc *(67 km/s)/Mpc = 3350 km/s
The RELATIVE redshift is
(deltaL)/L = V/c
The absolute redshift, delta L, depends upon the wavelength you are observing.