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compST:  Comptonization, Sunyaev & Titarchuk

A Comptonization spectrum after Sunyaev and Titarchuk 1980, A&A, 86, 121. This model is the Comptonization of cool photons on hot electrons.

par1

temperature in keV

par2

optical depth

norm

N*f/(4*pi*d^2), where N is the total number of photons from the source, d is the distance to the source, and f is the factor (z*(z+3)*y^z)/(gamma(2z+4)*gamma(z)). z is the spectral index, y is the injected photon energy in units of the temperature, and G is the incomplete gamma function.