compST: Comptonization, Sunyaev & Titarchuk

A Comptonization spectrum after Sunyaev & 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 $Nf/4\pi d^2$ , where is the total number of photons from the source, is the distance to the source, f is the factor $f=z(z+3)y^z/\Gamma(2z+4)/\Gamma(z)$ , is the spectral index, is the injected photon energy in units of the temperature, and $\Gamma$ is the incomplete gamma function.

par1	temperature in keV
par2	optical depth
norm	$Nf/4\pi d^2$ , where is the total number of photons from the source, is the distance to the source, f is the factor $f=z(z+3)y^z/\Gamma(2z+4)/\Gamma(z)$ , is the spectral index, is the injected photon energy in units of the temperature, and $\Gamma$ is the incomplete gamma function.