Convert energy flux to photon flux
energy_conv_factor(E1, E2, pho_ind = 2)energy min in keV
energy max in keV
Photon index, 2.0 default.
numeric
see https://hea-www.harvard.edu/~pgreen/figs/xray_cheat.pdf
energy_conv_factor(0.5, 8.0, pho_ind = 1.7)
#> [1] 2.831385e-09