The XSPEC lyman model: Voigt absorption profiles for H I or He II Lyman series.
xslyman The xslyman model is a multiplicative model component.
The model is described at  .
Deprecated in Sherpa 4.10.0
The nHeI and redshift parameters have been renamed to n and z respectively to match the XSPEC definition. The names nHeI and redshift can still be used to access the parameters, but they will be removed in a future release.
>>> create_model_component("xslyman", "mdl") >>> print(mdl)
Create a component of the xslyman model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.n thawed 1e-05 0 1e+06 10^22 atoms / cm^2 mdl.b thawed 10 1 100000 km/s mdl.z thawed 0 -0.001 100000 mdl.ZA thawed 1 1 2
The attributes for this object are:
The H I or He II column density, in 10^22 atoms/cm^2.
The b value, in km/s.
The redshift of the absorber.
The atomic number of the species being calculated.
-  https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelLyman.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.