Power law with high energy exponential cutoff. XSPEC model.
A power law with high energy exponential cutoff. The energy range must be positive and non-zero for this integrated model.
A(E) = KE^(-PhoIndex) exp(-E/HighECut)
If POW_EMIN and POW_EMAX have been defined by the set_xsxset command, then the norm becomes the flux in units of 10^-12 ergs/cm2/s over the energy range (POW_EMIN, POW_EMAX) keV, unless POW_EMIN = POW_EMAX, in which case the norm becomes the flux density in micro-Jansky at POW_EMIN keV. In these cases it is important that POW_EMIN and POW_EMAX lie within the energy range on which the model is being evaluated.
This is an additive model component.
|1||PhoIndex||power law photon index|
|2||HighECut||cutoff energy of exponential cutoff (in keV)|
|3||norm||K; photons/keV/cm^2/s at 1 keV|
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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