|AHELP for CIAO 4.9 Sherpa v1||
E-folded broken power law reflected from neutral matter. XSPEC model.
A broken power law spectrum multiplied by exponential high-energy cutoff Exp[-E/foldE], and reflected from neutral material. See Magdziarz and Zdziarski 1995, MNRAS, 273, 837 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 relRefl < 0. Then the actual reflection normalization is |relRefl|. Note that you need to change then the limits of relRefl excluding 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 set by the command set_xsabund. The opacities are those set by the command set_xsxsect. As expected in AGNs, H and He are assumed to be fully ionized.
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 BEXRAV_PRECISION, e.g.,
sherpa> set_xsxset('BEXRAV_PRECISION', '0.05')
The default precision is 0.01 (i.e., 1%).
This is an additive model component.
|1||Gamma1||first power law photon index|
|2||breakE||break energy (keV)|
|3||Gamma2||second power law photon index|
|4||foldE||the e-folding energy in keV (if foldE=0, there is no cutoff)|
|5||rel_refl||reflection scaling factor (1 for isotropic source above disk)|
|6||cosIncl||cosine of inclination angle|
|7||abund||abundance of elements heavier than He relative to the solar abundances|
|8||Fe_abund||iron abundance relative to the above|
|10||norm||photon flux at 1 keV of the cutoff broken power law only (no reflection) in the observed frame.|
This information is taken from the XSPEC User's Guide. Version 12.9.0o of the XSPEC models is supplied with CIAO 4.9.
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() '12.9.0o'
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