Synopsis
The XSPEC cemekl model: plasma emission, multi-temperature using mekal.
Syntax
xscemekl The xscemekl model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xscemekl", "mdl")
>>> print(mdl)Create a component of the xscemekl model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.alpha frozen 1 0.01 20 mdl.Tmax thawed 1 0.02725 100 keV mdl.nH frozen 1 1e-06 1e+20 cm^-3 mdl.abundanc frozen 1 0 10 mdl.Redshift frozen 0 -0.999 10 mdl.switch frozen 2 0 3 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| alpha | The power-law index of the emissivity function. |
| Tmax | The maximum temperature, in keV. |
| nH | H density, in cm^-3. |
| abundanc | The abundance relative to Solar, as set by set_xsabund . |
| redshift | The redshift of the plasma. |
| switch | If 0, the mekal code is run to evaluate the model; if 1 then interpolation of the mekal data is used; if 2 then interpolation of APEC data is used; if 3 then SPEX data (only usable with XSPEC 12.14.0 or later). See [1] for more details. This parameter can not be thawed. |
| norm | The normalization of the model. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelCemekl.html
Changes in CIAO
Changed in CIAO 4.17
The switch parameter default has changed from 1 to 2 to match XSPEC 12.14.0 and the maximum value is now 3.
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.