xszpowerlw

Context: models

Synopsis

The XSPEC zpowerlw model: redshifted power law photon spectrum.

Syntax

xszpowerlw

The xszpowerlw model is an additive model component.

Description

The model is described at [1] .

Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.PhoIndex thawed            1           -3           10           
   mdl.redshift frozen            0       -0.999           10           
   mdl.norm     thawed            1            0        1e+24

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
PhoIndex	The power law photon index.
redshift	The redshift.
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 .

References

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