xsheilin

Context: models

Synopsis

The XSPEC heilin model: Voigt absorption profiles for He I series.

Syntax

xsheilin

The xsheilin model is a multiplicative model component.

Description

The model is described at [1] .

Deprecated in Sherpa 4.10.0

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

Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.nHeI     thawed        1e-05            0        1e+06 10^22 atoms / cm^2
   mdl.b        thawed           10            1        1e+06       km/s
   mdl.z        thawed            0       -0.001       100000

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
nHeI	The He I column density, in 10^22 atoms/cm^2.
b	The b value, in km/s.
z	The redshift of the absorber.

References

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

XSPEC version

CIAO 4.17 comes with support for version 12.14.0k of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.14.0k

Bugs

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