Last modified: December 2018

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

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          0.3          0.8           
   mdl.break_   thawed     2.42e+17        1e+15        1e+19         Hz
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

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

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
xssresc