Synopsis
The XSPEC gabs model: gaussian absorption line.
Syntax
xsgabs The xsgabs model is a multiplicative model component.
Description
The model is described at [1] .
Deprecated in Sherpa 4.10.0
The tau parameter has been renamed strength to match the XSPEC definition. The name tau can still be used to access the parameter, but this name will be removed in a future release.
Example
>>> create_model_component("xsgabs", "mdl")
>>> print(mdl)Create a component of the xsgabs model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.LineE thawed 1 0 1e+06 keV mdl.Sigma thawed 0.01 0 20 keV mdl.Strength thawed 1 0 1e+06 keV
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| LineE | The line energy, in keV. |
| Sigma | The line width (sigma), in keV. |
| Strength | The line depth, in keV. The optical depth at the line center is Strength / (sqrt(2 pi) * Sigma). |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelGabs.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.