Exponentially cutoff power law reflected from ionized matter. XSPEC model.
Exponentially cutoff power law spectrum reflected from ionized material. See Magdziarz and Zdziarski (MNRAS, 273, 837; 1995) for details. Ionization and opacities of the reflecting medium are computed as in xsabsori. The output spectrum is the sum of an e-folded power law and the reflection component.
The reflection component alone can be obtained for relRefl < 0. Then the actual reflection normalization is |relRefl|. Note that you then need to change the limits of relRefl to exclude zero (as then the direct component appears). If foldE = 0 there is no cutoff in the power law.
The metal and iron abundance are variable with respect to those defined by the set_xsabund command.
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, e.g.,
sherpa> set_xsxset('PEXRIV_PRECISION', '0.05')
The default precision is 0.01 (i.e., 1%).
This is an additive model component.
|1||PhoIndex||power law photon index, N_E prop. to E^(-PhoIndx)|
|2||foldE||the e-folding energy in keV (if foldE=0, there is no cutoff; change the lower limit for that)|
|3||rel_refl||reflection scaling factor; if < 0, there is no direct component; relRefl=1 for isotropic source above disk|
|5||abund||abundance of elements heavier than He relative to that defined by set_xsabund|
|6||Fe_abund||iron abundance relative to that defined by set_xsabund|
|7||cosIncl||cosine of inclination angle|
|8||T_disk||disk temperature in K|
|9||xi||disk ionization parameter, xi = 4 pi F_ion/n, where F_ion is the 5 eV - 20 keV irradiating flux and n is the density of the reflector; see Done et al., 1992, ApJ, 395, 275|
|10||norm||photon flux at 1 keV (photons/keV/cm^2/s) of the power law only in the observed frame|
This information is taken from the XSPEC User's Guide. Version 12.9.1n of the XSPEC models is supplied with CIAO 4.10.
For a list of known bugs and issues with the XSPEC models, please visit the XSPEC bugs page.
To check the X-Spec version used by Sherpa, use the get_xsversion routine from the xspec module:
sherpa> from sherpa.astro.xspec import get_xsversion sherpa> get_xsversion() '12.9.1n'
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