xssnapec

Context: models

Synopsis

The XSPEC snapec model: galaxy cluster spectrum using SN yields.

Syntax

xssnapec

The xssnapec 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("xssnapec", "mdl")
>>> print(mdl)

Create a component of the xssnapec 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.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.
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

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.