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 cutoff 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 powerlaw only (no reflection) in the observed frame. 
HEASARC Home 
Observatories 
Archive 
Calibration 
Software 
Tools 
Students/Teachers/Public
Last modified: Tuesday, 28May2024 10:09:22 EDT
