xstbfeo

Context: models

Synopsis

The XSPEC TBfeo model: ISM grain absorption.

Syntax

xstbfeo

The xstbfeo model is a multiplicative model component.

Description

The model is described at [1] .

Example

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

Create a component of the xstbfeo 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.O        frozen            1       -1e+38        1e+38           
   mdl.Fe       frozen            1       -1e+38        1e+38           
   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).
O	Oxygen abundance relative to Solar.
Fe	Iron abundance relative to Solar.
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

Changes in CIAO

Changed in CIAO 4.17

The O and Fe parameters are now frozen by default to match XSPEC.

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.