The XSPEC sresc model: synchrotron spectrum, cut off by particle escape.
xssresc The xssresc model is an additive model component.
The model is described at  .
>>> create_model_component("xssresc", "mdl") >>> print(mdl)
Create a component of the xssresc model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.alpha thawed 0.5 0.3 0.8 mdl.rolloff thawed 2.42e+17 1e+15 1e+19 Hz mdl.norm thawed 1 0 1e+24
The attributes for this object are:
The radio spectral index.
The break frequency: approximately the frequency at which the flux has dropped by a factor of 6 from a straight power law. See  for more details.
The 1 Ghz flux in Jy.
-  https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelSresc.html
CIAO 4.12 comes with support for version 12.10.1n of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.10.1n
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.