    The XSPEC kerrdisk model: accretion disk line emission with BH spin as free parameter.

xskerrdisk
The xskerrdisk model is an additive model component.

The model is described at [1] .

The r_brg , rinms , and routms parameters have been renamed to r_br_g , rin_ms , and rout_ms respectively to match the XSPEC definition. The names r_brg , rinms , and routms can still be used to access the parameters, but they will be removed in a future release.

>>> create_model_component("xskerrdisk", "mdl")
>>> print(mdl)

Create a component of the xskerrdisk model and display its default parameters. The output is:

mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.lineE frozen 6.4 0.1 100 keV mdl.Index1 frozen 3 -10 10 mdl.Index2 frozen 3 -10 10 mdl.r_br_g frozen 6 1 400 mdl.a thawed 0.998 0.01 0.998 mdl.Incl frozen 30 0 90 deg mdl.Rin_ms frozen 1 1 400 mdl.Rout_ms frozen 400 1 400 mdl.z frozen 0 0 10 mdl.norm thawed 1 0 1e+24

ATTRIBUTES

The attributes for this object are:

Attribute
Definition
lineE
The rest-frame line energy, in keV.
Index1
The emissivity index for the inner disk.
Index2
The emissivity index for the outer disk.
r_br_g
The break radius separating the inner and outer portions of the disk, in gravitational radii.
a
The dimensionless black hole spin.
Incl
The disk inclination angle, in degrees. A face-on disk has Incl=0.
Rin_ms
The inner radius of the disk, in units of the radius of marginal stability.
Rout_ms
The outer radius of the disk, in units of the radius of marginal stability.
z
The redshift of the source.
norm
The flux in the line, in units of photon/cm^2/s.

References

[1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelKerrdisk.html

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