Synopsis
The XSPEC kyconv convolution model: convolution using a relativistic line from axisymmetric accretion disk
Syntax
xskyconv The xskyconv model is a convolution model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xskyconv", "mdl")
>>> print(mdl)Create a component of the xskyconv 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.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 0 0 2 mdl.ne_loc frozen 100 3 5000 mdl.normal frozen 1 -1 100
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| a | a/M, the black-hole angular momentum in (GM/c). |
| theta_o | The observer inclination in degrees (0 is pole on). |
| rin | The inner radius, in GM/c^2. |
| ms | Flag: 0 means integrate from rin, 1 means integrate the emission from above the marginally-stable orbit only. |
| rout | The outer radius, in GM/c^2. |
| 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 inner and outer emissivity laws, in units of GM/c^2. |
| zshift | The overall Doppler shift. |
| limb | Flag: 0 means isotropic emission, 1 means Laor's limb darkening (1 + 0.26 mu), 2 means Haardt's limb brightening (log(1 + 1 / mu)). |
| ne_loc | The number of grid points in local energy (energy resolution of local flux, the grid is equidistant in logarithmic scale). |
| normal | Flag: 0 means normalize total flux to unity, > 0 means normalize to unity at the energy given by the parameter value, and < 0 means unnormalized. |
Notes
Unlike XSPEC, the convolution model is applied directly to the model, or models, rather than using the multiplication symbol.
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelKyconv.html
Changes in CIAO
Added in CIAO 4.13
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
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.