Synopsis
The XSPEC compPS model: Comptonization, Poutanen & Svenson.
Syntax
xscompps The xscompps model is an additive model component.
Description
The model is described at [1] .
Deprecated in Sherpa 4.10.0
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.
Example
>>> 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 4.15 comes with support for version 12.12.1c of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.12.1c
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.