comptb: Thermal and bulk Comptonization of a seed blackbody-like spectrum

This model describes the Comptonization spectrum of soft photons off electrons which are either purely thermal or additionally subjected to an inward bulk motion. It consists of two components: one is the direct seed photon spectrum and the other one is the Comptonized spectrum. The latter is obtained as a self-consistent convolution of the seed photon spectrum with the system Green's function.

The model is not specific to bulk Comptonization but it includes in a coherent way different spectral shapes such as simple blackbody (i.e. neither thermal nor bulk Comptonization), thermal Comptonization (equivalent to compTT) and thermal plus bulk Comptonization. In the latter case, it can be considered a completion and update of the bmc model, as it includes the cut-off term in the spectrum.

All mathematical details of the model and its validity limits for applications are reported in Farinelli et al. (2008, ApJ 680, 602).

par1	kT$_{\mbox{s}}$, temperature of the seed photons (keV).
par2	gamma, index of the seed photon spectrum (default gamma=3).
par3	alpha, energy index of the Comptonization spectrum.
par4	delta, bulk parameter, efficiency of bulk over thermal Comptonization.
par5	kT$_{\mbox{e}}$, temperature of the electrons (keV).
par6	log(A), log of the illuminating factor parameter (A).
norm	Normalization of the seed photon spectrum, defined in the same way as the bbody model.

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