Synopsis
The XSPEC xscat model: dust scattering.
Syntax
xsxscat The xsxscat model is a multiplicative model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsxscat", "mdl")
>>> print(mdl)Create a component of the xsxscat model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.NH thawed 1 0 1000 10^22 mdl.Xpos thawed 0.5 0 0.999 mdl.Rext frozen 10 0 240 arcsec mdl.DustModel frozen 1 -3.40282e+38 3.40282e+38
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| NH | Interstellar hydrogen column density (in units of 10^22 atoms/cm^2). |
| Xpos | The relative position of the dust along the line of sight. A value of 0 means the dust is at the observer, and of 0.95 means that the dust is 5% from the source. |
| Rext | The radius of the circular extraction region, in arcsec. |
| DustModel | The dust model used: see [1] for more information. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelXscat.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.