Synopsis
The XSPEC kyrline model: relativistic line from axisymmetric accretion disk
Syntax
xskyrline The xskyrline model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xskyrline", "mdl")
>>> print(mdl)Create a component of the xskyrline model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.a thawed 0.9982 0 1 GM/c mdl.theta_o thawed 30 0 89 deg mdl.rin frozen 1 1 1000 GM/c^2 mdl.ms frozen 1 0 1 mdl.rout frozen 400 1 1000 GM/c^2 mdl.Erest frozen 6.4 1 99 keV mdl.alpha frozen 3 -20 20 mdl.beta frozen 3 -20 20 mdl.rb frozen 400 1 1000 GM/c^2 mdl.zshift frozen 0 -0.999 10 mdl.limb frozen 1 0 2 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| a | Black Hole angular momentum, in units of GM/c. |
| theta_o | The observer inclination, where 0 is pole on. The units are degrees. |
| rin | The inner radius (units of GM/c^2). |
| ms | A flag that determines whether to integrate from rin (0) or to integrate emission from above the marginally-stable orbit only (1) |
| rout | The outer radius (units of GM/c^2). |
| Erest | The line energy in keV. |
| alpha | The accretion disk emissivity scales as r^(-alpha) for r < rb. |
| beta | The accretion disk emissivity scales as r^(-beta) for r > rb. |
| rb | The boundary radius between the inner and outer emissivity laws (units of GM/c^2). |
| zshift | The overall Doppler shift. |
| limb | 0 means isotropic emission, 1 means Laor's limb darkening (1 + 0.26 mu), 2 means Haardt's limb brightening (ln(1 + 1/mu)) |
| norm | The normalization. |
Notes
Early releases of XSPEC 12.10.1 refer to the first parameter as a/M. As this is not a valid Python name, the parameter has been renamed "a" to better match other XSPEC models (after consultation with Keith Arnaud).
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelKyrline.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.