Synopsis
The XSPEC zbabs model: EUV ISM attenuation.
Syntax
xszbabs The xszbabs model is a multiplicative model component.
Description
The model is described at [1] .
Deprecated in Sherpa 4.10.0
The redshift parameter has been renamed z to match the XSPEC definition. The name redshift can still be used to access the parameter, but this name will be removed in a future release.
Example
>>> create_model_component("xszbabs", "mdl")
>>> print(mdl)Create a component of the xszbabs model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.nH thawed 0.0001 0 1e+06 10^22 atoms / cm^2 mdl.nHeI thawed 1e-05 0 1e+06 10^22 atoms / cm^2 mdl.nHeII thawed 1e-06 0 1e+06 10^22 atoms / cm^2 mdl.z thawed 0 0 1e+06
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| nH | The H column density, in 10^22 atoms/cm^2. |
| nHeI | The He I column density, in 10^22 atoms/cm^2. |
| nHeII | The He II column density, in 10^22 atoms/cm^2. |
| z | The redshift of the absorber. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelZbabs.html
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.