Exponentially cut off power law spectrum reflected from ionized material (Magdziarz & Zdziarski 1995, MNRAS, 273, 837). Ionization and opacities of the reflecting medium is computed as in the absori model. The output spectrum is the sum of the cut-off power law and the reflection component. The reflection component alone can be obtained for . Then the actual reflection normalization is . Note that you need to then change the limits of to exclude zero (as then the direct component appears). If = 0 there is no cutoff in the power law. The metal and iron abundance are variable with respect to those defined by the command abund.
The core of this model is a Greens' function integration with one numerical integral performed for each model energy. The numerical integration is done using an adaptive method which continues until a given estimated fractional precision is reached. The precision can be changed by setting PEXRIV_PRECISION eg xset PEXRIV_PRECISION 0.05. The default precision is 0.01 (ie 1%).
|par1||, first power law photon index,|
|par2||, cutoff energy (keV) (if = 0 there is no cutoff)|
|par3||, reflection scaling factor (0 = no reflected component, <0 reflection component only)|
|par5||abundance of elements heavier than He relative to the solar abundances|
|par6||iron abundance relative to that defined by abund|
|par7||cosine of inclination angle|
|par8||disk temperature in K|
|par9||disk ionization parameter, , where is the 5eV - 20keV irradiating flux, is the density of the reflector; see Done et al., 1992, ApJ, 395, 275.|
|norm||photon flux at 1 keV (photons/keV/cm/s) of the cutoff broken power-law only (no reflection) in the observed frame.|