bexriv: reflected e-folded broken power law, ionized medium

A broken power-law spectrum multiplied by exponential high-energy cutoff, exp(-E/Ec), and reflected from ionized material. See Magdziarz & Zdziarski (1995) for details.

The output spectrum is the sum of an e-folded broken power law and the reflection component. The reflection component alone can be obtained for $\vert rel_{refl}\vert < 0$. Then the actual reflection normalization is $\vert rel_{refl}\vert$. Note that you need to change then the limits of $\vert rel_{refl}\vert$ excluding zero (as then the direct component appears). If $E_c = 0$, there is no cutoff in the power law. The metal and iron abundance are variable with respect to those set 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 BEXRIV_PRECISION eg xset BEXRIV_PRECISION 0.05. The default precision is 0.01 (ie 1%).

par1 $\Gamma_1$, first power law photon index
par2 $E_{break}$, break energy (keV)
par3 $\Gamma_2$, second power law photon index
par4 $E_c$, the e-folding energy in keV (if $E_c = 0$ there is no cutoff)
par5 $rel_{refl}$, reflection scaling factor (1 for isotropic source above disk)
par6 $z$, redshift
par7 abundance of elements heavier than He relative to the solar abundances
par8 iron abundance relative to the above
par9 cosine of inclination angle
par10 disk temperature (K)
par11 disk ionization parameter, $\xi = 4\pi F_{ion} / n$, where $F_{ion}$ is the 5eV-20keV irradiating flux and $n$ is the density of the reflector; see Done et al. (1992).
norm photon flux at 1 keV of the cutoff broken power-law only (no reflection) in the observed frame.

HEASARC Home | Observatories | Archive | Calibration | Software | Tools | Students/Teachers/Public

Last modified: Tuesday, 28-May-2024 10:09:22 EDT