Synopsis
The XSPEC snapec model: galaxy cluster spectrum using SN yields.
Syntax
xsbsnapec The xsbsnapec model is an additive model component.
Description
The model is described at [1] . The set_xsxset and get_xsxset functions are used to set and query the XSPEC XSET parameters to control the APEC model.
Example
>>> create_model_component("xsbsnapec", "mdl")
>>> print(mdl)Create a component of the xsbsnapec 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.N_SNe thawed 1 0 1e+20 10^9 mdl.R thawed 1 0 1e+20 mdl.SNIModelIndex frozen 1 0 125 mdl.SNIIModelIndex frozen 1 0 125 mdl.redshift frozen 0 0 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. |
| N_SNe | The number of SNe (in units of 10^9). |
| R | The percentage of SNIa. |
| SNIModelIndex | SNIa yield model: see [1] for more details. |
| SNIIModelIndex | SNII yield model: see [1] for more details. |
| redshift | The redshift of the plasma. |
| Velocity | The gaussian sigma for 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/XSmodelSnapec.html
Changes in CIAO
Added in CIAO 4.17
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.