xstbgas

Context: models

Synopsis

The XSPEC TBgas model: ISM grain absorption.

Syntax

xstbgas

The xstbgas model is a multiplicative model component.

Description

The model is described at [1] .

Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.nH       thawed            1            0        1e+06      10^22
   mdl.redshift frozen            0           -1           10

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
nH	The equivalent hydrogen column (in units of 10^22 atoms/cm^2).
redshift	The redshift of the absorber.

Notes

The `set_xsabund` function changes the relative abundances of the elements, in particular the "wilm" setting.

References

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