pexriv: reflected powerlaw, ionized medium

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) |

par4 | redshift, z |

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. |