    The XSPEC compPS model: Comptonization, Poutanen & Svenson.

xscompps
The xscompps model is an additive model component.

The model is described at [1] .

The tauy and hrcyl parameters have been renamed to tau_y

and hovr_cyl respectively to match the XSPEC definition. The names

tauy and hrcyl can still be used to access the parameters, but they will be removed in a future release.

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

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

mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.kTe thawed 100 20 100000 keV mdl.EleIndex frozen 2 0 5 mdl.Gmin frozen -1 -1 10 mdl.Gmax frozen 1000 10 10000 mdl.kTbb frozen 0.1 0.001 10 keV mdl.tau_y thawed 1 0.05 3 mdl.geom frozen 0 -5 4 mdl.HovR_cyl frozen 1 0.5 2 mdl.cosIncl frozen 0.5 0.05 0.95 mdl.cov_frac frozen 1 0 1 mdl.rel_refl frozen 0 0 10000 mdl.Fe_ab_re frozen 1 0.1 10 mdl.Me_ab frozen 1 0.1 10 mdl.xi frozen 0 0 100000 mdl.Tdisk frozen 1e+06 10000 1e+06 K mdl.Betor10 frozen -10 -10 10 mdl.Rin frozen 10 6.001 10000 Rs mdl.Rout frozen 1000 0 1e+06 Rs mdl.redshift frozen 0 -0.999 10 mdl.norm thawed 1 0 1e+24

ATTRIBUTES

The attributes for this object are:

Attribute
Definition
kTe
The electron temperature in keV.
EleIndex
The electron power-law index.
Gmin
The minimum Lorentz factor gamma.
GMax
The maximum Lorentz factor gamma: see [1] for more details.
kTbb
The temperature of the soft photons, in keV.
tau_y
The vertical optical depth of the corona: see [1] for more details.
geom
The geometry to use; see [1] for more details.
HovR_cyl
The value of H/R, when a cylinder geometry is used (abs(geom) = 2).
cosIncl
The cosine of the inclination angle.
cov_frac
The covering fraction of the cold clouds (only used when abs(geom) < 4).
rel_refl
The amount of reflection (Omega / (2 pi))
Fe_ab_re
The iron abundance, in units of solar.
Me_ab
The abundance of heavy elements, in units of solar.
xi
The disk ionization parameter.
Tdisk
The disk temperature for reflection, in K.
Betor10
The reflection emissivity law: see [1] for more details.
Rin
The inner radius of the disk in Schwarzschild units.
Rout
The outer radius of the disk in Schwarzschild units.
redshift
The redshift of the source.
norm
The normalization of the model.

Notes

The precision of the numerical integration can be changed by using the set_xsxset function to set the value of the COMPPS_PRECISION keyword, which defines the fractional precision. The default is 0.01 (1%).

References

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