    The XSPEC compth model: Paolo Coppi's hybrid (thermal/non-thermal) hot plasma emission models.

xscompth
The xscompth model is an additive model component.

The model is described at [1] .

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

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

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

mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.theta thawed 1 1e-06 1e+06 keV mdl.showbb frozen 1 0 10000 mdl.kT_bb frozen 200 1 400000 eV mdl.RefOn frozen -1 -2 2 mdl.tau_p frozen 0.1 0.0001 10 mdl.radius frozen 1e+07 100000 1e+16 cm mdl.g_min frozen 1.3 1.2 1000 mdl.g_max frozen 1000 5 10000 mdl.G_inj frozen 2 0 5 mdl.pairinj frozen 0 0 1 mdl.cosIncl frozen 0.5 0.05 0.95 mdl.Refl frozen 1 0 2 mdl.Fe_abund frozen 1 0.1 10 mdl.Ab_met frozen 1 0.1 10 mdl.T_disk frozen 1e+06 10000 1e+06 K mdl.xi thawed 0 0 5000 mdl.Beta frozen -10 -10 10 mdl.Rin frozen 10 6.001 10000 M mdl.Rout frozen 1000 0 1e+06 M mdl.redshift frozen 0 0 4 mdl.norm thawed 1 0 1e+24

ATTRIBUTES

The attributes for this object are:

Attribute
Definition
theta
showbb
kT_bb
The temperature of the blackbody if greater than 0. When less than zero then the absolute value is used as the T_max parameter of the xsdispkpn model. The units are in eV.
RefOn
tau_p
The Thomson scattering depth.
radius
The size of the scattering region in cm.
g_min
The minimum Lorentz factor of the pairs.
g_max
The maximum Lorentz factor of the pairs.
G_inj
If less than zero then the non-thermal spectrum is assumed mono-energetic at g_max, otherwise a power law is used from g_min to g_max.
pairinj
If zero then accelerated particles are electrons from thermal pool. If one then accelerated particles are electrons and positrons.
cosIncl
The cosine of the inclination angle of the reflecting material to the line of sight.
Refl
The fraction of the scattering region's emission intercepted by reflecting material.
Fe_abund
The iron abundance with respect to solar.
Ab_met
The abundance of the other metals with respect to solar.
T_disk
The temperature of the reflecting disk, in K.
xi
The ionization parameter of the reflector.
Beta
The power-law index with radius of disk reflection emissivity.
Rin
The inner radius of the reflecting material, in units of GM/c^2.
Rout
The outer radius of the reflecting material, in units of GM/c^2.
redshift
The redshift of the source.
norm
The normalization of the model: see [1] for more details.

Notes

The precision of the numerical integration can be changed by using the set_xsxset function to set the value of the EQPAIR_PRECISION keyword, which defines the fractional precision. The default is 0.01 (1%).

References

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