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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
    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
    Mauybe the radisu of Sag A* is much alrgher than normal AGn, or Ive made a mistake somehwere. Any ideas?
  2. jcsd
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