HEASoft and XSPEC are now available as conda packages. See details ....
Thermal and bulk Comptonization of a seed blackbody-like spectrum
This model is now in the Xspec release and this page is superceded by the Xspec manual
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.
par1 = kTs, 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 = kTe, temperature of the electrons (keV)
par6 = log(A), log of the illuminating factor parameter (A)
par7 = Cn, normalization of the seed photon spectrum, defined in
the same way as the XSPEC bbody model
All mathematical details of the model and its validity limits for applications are reported in Farinelli et al. (2008, ApJ, 680, 602). The source code, model file, and a guide to installing this model are included in this tar file.