Last modified: December 2022

URL: https://cxc.cfa.harvard.edu/sherpa/ahelp/xsexpfac.html
AHELP for CIAO 4.15 Sherpa

xsexpfac

Context: models

Synopsis

The XSPEC expfac model: exponential modification.

Syntax

xsexpfac

The xsexpfac model is a multiplicative model component.

Description

The model is described at [1] .


Example

>>> create_model_component("xsexpfac", "mdl")
>>> print(mdl)

Create a component of the xsexpfac model and display its default parameters. The output is:

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.Ampl     thawed            1            0        1e+06           
   mdl.Factor   thawed            1            0        1e+06           
   mdl.StartE   frozen          0.5            0        1e+06        keV

ATTRIBUTES

The attributes for this object are:

Attribute Definition
Ampl The amplitude of the effect.
Factor The exponential factor.
StartE The start energy of the modification, in keV.

References

XSPEC version

CIAO 4.15 comes with support for version 12.12.1c of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.12.1c

Bugs

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