Synopsis
The XSPEC varabs model: photoelectric absorption.
Syntax
xsvarabs The xsvarabs model is a multiplicative model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsvarabs", "mdl")
>>> print(mdl)Create a component of the xsvarabs model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.H frozen 1 0 10000 sH22 mdl.He frozen 1 0 10000 sHe22 mdl.C frozen 1 0 10000 sC22 mdl.N frozen 1 0 10000 sN22 mdl.O frozen 1 0 10000 sO22 mdl.Ne frozen 1 0 10000 sNe22 mdl.Na frozen 1 0 10000 sNa22 mdl.Mg frozen 1 0 10000 sMg22 mdl.Al frozen 1 0 10000 sAl22 mdl.Si frozen 1 0 10000 sSi22 mdl.S frozen 1 0 10000 sS22 mdl.Cl frozen 1 0 10000 sCl22 mdl.Ar frozen 1 0 10000 sAr22 mdl.Ca frozen 1 0 10000 sCa22 mdl.Cr frozen 1 0 10000 sCr22 mdl.Fe frozen 1 0 10000 sFe22 mdl.Co frozen 1 0 10000 sCo22 mdl.Ni frozen 1 0 10000 sNi22
ATTRIBUTES
The attribute for this object is:
| Attribute | Definition |
|---|---|
| H, He, C, N, O, Ne, Na, Mg, Al, Si, S, Cl, Ar, Ca, Cr, Fe, Co, Ni | See [1] for a description of the units. |
Notes
The `set_xsxsect` function changes the cross sections used by this model. The `set_xsabund` function changes the relative abundances of the elements.
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelVarabs.html
XSPEC version
CIAO 4.16 comes with support for version 12.13.1e of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.13.1e
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.