Question

Imagine that optical and radio observations of a spiral galaxy have revealed the following:
optical flux: F= 4.00x10^-12 J/s.m^2
redshift: z = 1000 km/s
width of emission-line from gas in disk: Wo=300 km/s
angular size of the length of disk: =1000"
inclination of disk relative to plane of sky: i=45 degrees

a) Estimate the mass of this galaxy.
b) What is M/L for this galaxy?

Answer 1

can someone please help me!