pexriv: reflected powerlaw, ionized medium
Exponentially cut off power law spectrum reflected from ionized
material (Magdziarz & Zdziarski 1995). 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). |
norm |
photon flux at 1 keV (photons/keV/cm/s) of the cutoff
broken power-law only (no reflection) in the observed frame. |
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Last modified: Friday, 23-Aug-2024 13:20:40 EDT
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