xssrcut

Context: models

Synopsis

The XSPEC srcut model: synchrotron spectrum, cutoff power law.

Syntax

xssrcut

The xssrcut model is an additive model component.

Description

The model is described at [1] .

Deprecated in Sherpa 4.10.0

The breakfreq parameter has been renamed break_ to match the XSPEC definition. The name breakfreq can still be used to access the parameter, but this name will be removed in a future release.

Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.alpha    thawed          0.5        1e-05            1           
   mdl.break_   thawed     2.42e+17        1e+10        1e+25         Hz
   mdl.norm     thawed            1            0        1e+24

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
alpha	The radio spectral index.
break	The break frequency: approximately the frequency at which the flux has dropped by a factor of 10 from a straight power law.
norm	The 1 Ghz flux in Jy.

References

[1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelSrcut.html

XSPEC version

CIAO 4.16 comes with support for version 12.13.1e of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.13.1e

Bugs

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