Synopsis
The XSPEC acisabs model: Chandra ACIS q.e. decay.
Syntax
xsacisabs The xsacisabs model is a multiplicative model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsacisabs", "mdl") >>> print(mdl)
Create a component of the xsacisabs model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.Tdays frozen 850 0 10000 days mdl.norm frozen 0.00722 0 1 mdl.tauinf frozen 0.582 0 1 mdl.tefold frozen 620 1 10000 days mdl.nC frozen 10 0 50 mdl.nH frozen 20 1 50 mdl.nO frozen 2 0 50 mdl.nN frozen 1 0 50
ATTRIBUTES
The attributes for this object are:
Attribute | Definition |
---|---|
Tdays | Days between Chandra launch and ACIS observation. |
norm | |
tauinf | Slope of linear quantum efficiency decay. |
tefold | Offset of linear quantum efficiency decay. |
nC | Number of carbon atoms in hydrocarbon. |
nH | Number of hydrogen atoms in hydrocarbon. |
nO | Number of oxygen atoms in hydrocarbon. |
nN | Number of nitrogen atoms in hydrocarbon. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelAcisabs.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.