- #1

skydivephil

- 474

- 9

Here are my calculations:

The radius of Sagittarius A star, the black hole at the centre of our galaxy is a number I couldn’t find. However it’s mass is easily available: 3.6 mio solar mass

We can compute the radius using the Schwarzschild formula

Rs=2GM/c^2

Where Rs is the Schwarzschild radius

G is the gravitational constant = 6.67*10^-11

M is the mass in kg is 7.2*10^36

C is the speed of light 3*10*8

So we have 2*6.67*10-11*7.2*10^36/9*10^16

= 1.07*10^10

No we can calculate the accretion energy using

GM/R = 6.67*10^-11*2*10^30/1.0*10^10

=1.25*10^10

Mauybe the radisu of Sag A* is much alrgher than normal AGn, or I've made a mistake somehwere. Any ideas?