calc_redshift_factor

luminet.black_hole_math.calc_redshift_factor(radius, angle, incl, bh_mass, b)

Calculate the gravitational redshift factor (ignoring cosmological redshift):

\[1 + z = (1 - \Omega b \cos(\eta)) \left( -g_{tt} - 2 \Omega g_{t\phi} - \Omega^2 g_{\phi\phi} \right)^{-1/2}\]

Attention

Luminet [1] does not have the correct equation for the redshift factor. The correct formula is given above. The resulting images of the paper are correct though.