Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculating the output of Seyferrt Galaxy

  1. Mar 6, 2012 #1
    Im trying to calcuate the energy output of Saigtarius A star if it were to accrete material at the same rate as a typical Seyfert Galaxy which I understand to be about 1 solar mass per year (correct?). Im getting an answer that looks way too low. As I understand it we should get a number something like 10^37
    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 Ive made a mistake somehwere. Any ideas?
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted



Similar Discussions: Calculating the output of Seyferrt Galaxy
  1. The shape of galaxies (Replies: 9)

Loading...