Synopsis
The XSPEC cie model: Emission spectrum from a plasma in Collisional-ionization equilibrium.
Syntax
xscie The xscie model is an additive model component.
Description
The model is described at [1] . Note that set_xsxset should be used to change the XSET settings.
Example
>>> create_model_component("xscie", "mdl")
>>> print(mdl)Create a component of the xscie model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.kT thawed 1 0.008 64 keV mdl.Abundanc frozen 1 0 5 mdl.Redshift frozen 0 -0.999 10 mdl.switch frozen 2 0 3 mdl.norm thawed 1 0 1e+24
PARAMETERS
The parameters for this function are:
| Parameter | Definition |
|---|---|
| kT | The plasma temperature in keV. |
| Abundanc | The metal abundances (He fixed at that defined by the set_xsabund command). The elements included are C, N, O, Ne, Mg, Al, Si, S, Ar, Ca, Fe, and Ni. Relative abundances are set by set_xsabund ). The trace element abundaces are controlled by the "APEC_TRACE_ABUND" setting and default to 1.0. |
| Redshift | The redshift of the plasma. |
| switch | If 0, the mekal code is run to evaluate the model; if 1 then interpolation of the mekal data is used; if 2 then interpolation of APEC data is used; if 3 then SPEX data. See [1] for more details. This parameter can not be thawed. |
| norm | The normalization of the model. See [1] for more details. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelCie.html
Changes in CIAO
Added in CIAO 4.17
XSPEC version
CIAO 4.17 comes with support for version 12.14.0k of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.14.0k
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.