calc_x0¶

luminet.black_hole_math.calc_x0(bh_mass, a)¶

Calculcate \(x_0\) for Kerr black holes.

\[x_0 = \sqrt{\frac{r_{ms}}{M}}\]

Parameters:

bh_mass (float) – Mass of the black hole.
a (float) – Specific angular momentum of the black hole. Should always be between \(-1\) and \(1\). \(a > 0\) if the accretion disk orbits in the same direction as the hole rotates; \(a < 0\) if it orbits in the opposite direction.