    The XSPEC xion model: reflected spectrum of photo-ionized accretion disk/ring.

xsxion
The xsxion model is a multiplicative model component.

The model is described at [1] .

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

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

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

mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.height thawed 5 0 100 r_s mdl.lxovrld thawed 0.3 0.02 100 mdl.rate thawed 0.05 0.001 1 mdl.cosAng thawed 0.9 0 1 mdl.inner thawed 3 2 1000 r_s mdl.outer thawed 100 2.1 100000 r_s mdl.index thawed 2 1.6 2.2 mdl.redshift frozen 0 -0.999 10 mdl.Feabun frozen 1 0 5 mdl.E_cut thawed 150 20 300 keV mdl.Ref_type frozen 1 1 3 mdl.Rel_smear frozen 4 1 4 mdl.Geometry frozen 1 1 4

ATTRIBUTES

The attributes for this object are:

Attribute
Definition
height
The height of the source above the disk (in Schwarzschild radii).
lxovrld
The ratio of the X-ray source luminosity to that of the disk.
rate
The accretion rate (in Eddington units).
cosAng
The cosine of the inclination angle (1 is face on).
inner
The inner radius of the disk (in Schwarzschild radii).
outer
The outer radius of the disk (in Schwarzschild radii).
index
The photon index of the source.
redshift
The redshift of the absorber.
Feabun
The Fe abundance relative to Solar: see [1] for more details.
E_cut
The exponential high energy cut-off energy for the source.
Ref_type
See [1] for details.
Ref_smear
See [1] for details.
Geometry
See [1] for details.

References

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

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

December 2023