Last modified: December 2018

URL: http://cxc.harvard.edu/sherpa/ahelp/xssnapec.html
AHELP for CIAO 4.11 Sherpa v1

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:

kT

The temperature of the plasma, in keV.

N_SNe

The number of SNe (in units of 10^9).

R

The percentage of SN1a.

SNIModelIndex

SNIa yield model: see [1] for more details.

SNIIModelIndex

SNIIa 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

XSPEC version

CIAO 4.11 comes with support for version 12.10.0e of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.10.0e

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

See Also

models
xsapec