    The XSPEC kyconv convolution model: convolution using a relativistic line from axisymmetric accretion disk

xskyconv
The xskyconv model is a convolution model component.

The model is described at [1] .

>>> 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

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