Synopsis
The XSPEC bapec model: velocity broadened APEC thermal plasma model.
Syntax
xsbapec The xsbapec model is an additive model component.
Description
The model is described at [1] . The set_xsabund and get_xsabund functions change and return the current settings for the relative abundances of the metals. The set_xsxset and get_xsxset functions are used to set and query the XSPEC XSET parameters, in particular the keywords "APECROOT" and "APEC_TRACE_ABUND".
Example
>>> create_model_component("xsbapec", "mdl")
>>> print(mdl)Create a component of the xsbapec model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.kT thawed 1 0.008 64 keV mdl.Abundanc frozen 1 0 5 mdl.Redshift frozen 0 -0.999 10 mdl.Velocity frozen 0 0 10000 km/s mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| kT | The temperature of the plasma, in keV. |
| Abundanc | The metal abundance of the plasma, as defined by the set_xsabund function and the "APEC_TRACE_ABUND" xset keyword. |
| Redshift | The redshift of the plasma. |
| Velocity | The gaussian sigma of the velocity broadening, in km/s. |
| norm | The normalization of the model: see [1] for an explanation of the units. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelBapec.html
Changes in CIAO
Changed in CIAO 4.16
The maximum for the Velocity parameter has been changed from 10^6 to 10^4 km/s.
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.