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## ThComp: Thermally comptonized continuum

ThComp is a replacement for the nthcomp model (Zdziarski et al. 1996). It agrees much better than nthcomp with actual Monte Carlo spectra from Comptonization, see Zdziarski et al. (2020) for details. See Niedzwiecki et al. (2019) for analogous comparison with nthcomp, showing substantial discrepancies. ThComp describes spectra from Comptonization by thermal electrons emitted by a spherical source with the sinusoidal-like spatial distribution of the seed photons (as in compST, Sunyaev & Titarchuk 1980). It is a convolution model, and thus it can Comptonize any seed photon distribution, either hard or soft, and it describes both upscattering and downscattering (see Zdziarski et al. 2020 for examples). In the case of upscattering of some seed photons (e.g. blackbody or disc blackbody), it is a much better description of the continuum shape from thermal Comptonization than an exponentially cutoff power law, but has similar corresponding free parameters, the spectral index, , and the high-energy cutoff, parameterized by the electron temperature (). That cutoff is much sharper than an exponential. The model also provides correct description of Comptonized spectra at energies comparable to those of the seed photons. Note that the model has no normalization parameter since its normalization follows from that of the seed photons.

Please reference Zdziarski et al. (2020) if you use it.

For this model to work correctly the energy range should be extended beyond that required by the response, e.g. by using the command: energies 0.01 1000.0 1000 log

 par1 , : the low-energy power-law photon index; : the Thomson optical depth (given by the absolute value). par2 , electron temperature (high energy rollover) par3 , the covering fraction, , if 1 all of the seed photons will be Comptonized; if set to 0, only the original seed photons will be seen. par4 redshift

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