Last modified: December 2018

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

xszcutoffpl

Context: models

Synopsis

The XSPEC zcutoffpl model: power law, high energy exponential cutoff.

Syntax

xszcutoffpl

The xszcutoffpl model is an additive model component.

Description

The model is described at [1] .


Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.PhoIndex thawed            1           -2            9           
   mdl.HighECut thawed           15            1          500        keV
   mdl.Redshift frozen            0       -0.999           10           
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

PhoIndex

The power law photon index.

HighECut

The e-folding energy of the exponential rolloff, in keV.

Redshift

The redshift of the source.

norm

The normalization of the model. See [1] for details, as its meaning depends on whether the "POW_EMIN" or "POW_EMAX" keywords have been set with set_xsxset .

New in CIAO 4.11

The xszcutoffpl model (added in XSPEC 12.10.0) is new in CIAO 4.11

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
xsbkn2pow, xsbknpower, xszpowerlw