Synopsis
The XSPEC kerrd model: optically thick accretion disk around a Kerr black hole.
Syntax
xskerrd The xskerrd model is an additive model component.
Description
The model is described at [1] .
Deprecated in Sherpa 4.10.0
The tcolteff parameter has been renamed tcoloteff to match the XSPEC definition. The name tcolteff can still be used to access the parameter, but this name will be removed in a future release.
Example
>>> create_model_component("xskerrd", "mdl")
>>> print(mdl)Create a component of the xskerrd model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.distance frozen 1 0.01 1000 kpc mdl.TcoloTeff frozen 1.5 1 2 mdl.M thawed 1 0.1 100 solar mdl.Mdot thawed 1 0.01 100 1e18 mdl.Incl frozen 30 0 90 deg mdl.Rin frozen 1.235 1.235 100 Rg mdl.Rout frozen 100000 10000 1e+08 Rg mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| distance | The distance, in units of kpc. |
| TcoloTeff | The spectral hardening factor, Tcol/Teff. See [1] for more details. |
| M | The mass of the central object, in solar masses. |
| Mdot | The mass accretion rate in units of 10^18 g/s. |
| Incl | The disk inclination angle, in degrees. A face-on disk has Incl=0. |
| Rin | The inner radius, in units of GM/c^2. The last stable orbit is 1.235. |
| Rout | The outer radius, in units of GM/c^2. |
| norm | The normalization of the model. It should be fixed to 1. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelKerrd.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.