    The XSPEC optxagn model: Colour temperature corrected disc and energetically coupled Comptonisation model for AGN.

xsoptxagn
The xsoptxagn model is an additive model component.

The model is described at [1] .

The loglledd parameter has been renamed logloledd to match the XSPEC definition. The name loglledd can still be used to access the parameter, but this name will be removed in a future release.

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

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

mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.mass frozen 1e+07 1 1e+09 solar mdl.dist frozen 100 0.01 1e+09 Mpc mdl.logLoLEdd thawed -1 -10 2 mdl.astar frozen 0 0 0.998 mdl.rcor thawed 10 1 100 rg mdl.logrout frozen 5 3 7 mdl.kT_e thawed 0.2 0.01 10 keV mdl.tau thawed 10 0.1 100 mdl.Gamma thawed 2.1 0.5 10 mdl.fpl thawed 0.0001 0 0.1 mdl.fcol frozen 2.4 1 5 mdl.tscat frozen 100000 10000 100000 mdl.Redshift frozen 0 0 10 mdl.norm thawed 1 0 1e+24

ATTRIBUTES

The attributes for this object are:

Attribute
Definition
mass
The black hole mass in solar masses.
dist
The comoving (proper) distance in Mpc.
logLoLEdd
The Eddington ratio.
astar
The dimensionless black hole spin.
rcor
The coronal radius in Rg=GM/c^2. See [1] for more details.
logrout
The log of the outer radius of the disk in units of Rg. See

[1] for more details.
kT_e
The electron temperature for the soft Comptonisation component (soft excess), in keV.
tau
The optical depth of the soft Comptonisation component. If this parameter is negative then only the soft Compton component is used.
Gamma
The spectral index of the hard Comptonisation component ('power law') which has temperature fixed to 100 keV.
fpl
The fraction of the power below rcor which is emitted in the hard comptonisation component. If this parameter is negative then only the hard Compton component is used.
fcol
The colour temperature correction to apply to the disc blackbody emission for radii below rcor with effective temperature > tscat.
tscat
The effective temperature limit, in K, used in the colour temperature correction.
Redshift
The redshift.
norm
The normalization of the model. It must be frozen.

References

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