Synopsis
The XSPEC nteea model: non-thermal pair plasma.
Syntax
xsnteea The xsnteea model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsnteea", "mdl")
>>> print(mdl)Create a component of the xsnteea model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.l_nth thawed 100 0 10000 mdl.l_bb thawed 100 0 10000 mdl.f_refl thawed 0 0 4 mdl.kT_bb frozen 10 1 100 mdl.g_max frozen 1000 5 10000 mdl.l_th frozen 0 0 10000 mdl.tau_p frozen 0 0 10 mdl.G_inj frozen 0 0 5 mdl.g_min frozen 1.3 1 1000 mdl.g_0 frozen 1.3 1 5 mdl.radius frozen 1e+13 100000 1e+16 mdl.pair_esc frozen 0 0 1 mdl.cosIncl thawed 0.45 0.05 0.95 mdl.Fe_abund frozen 1 0.1 10 mdl.redshift frozen 0 -0.999 10 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| l_nth | The nonthermal electron compactness. |
| l_bb | The blackbody compactness. |
| f_refl | The scaling factor for reflection. This is 1 for an isotropic source above the disk. |
| kT_bb | The blackbody temperature in eV. |
| g_max | The maximum Lorentz factor. |
| l_th | The thermal compactness. Set to 0 for a pure nonthermal plasma. |
| tau_p | The Thomson optical depth of ionization electrons. |
| G_inj | The electron injection index (0 for monoenergetic injection). |
| g_min | The minimum Lorentz factor of the power law injection (not used for monoenergetic injection). |
| g_0 | The minimum Lorentz factor for nonthermal reprocessing, in the range (1, g_min]. |
| radius | The radius in cm (for Coulomb/bremsstrahlung only). |
| pair_esc | The pair escape rate in c. |
| cosIncl | The cosine of the inclination angle. |
| Fe_abund | The iron abundance relative to that set by the set_xsabund function. |
| 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 NTEEA_PRECISION keyword, which defines the fractional precision. The default is 0.01 (1%).
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelNteea.html
XSPEC version
CIAO 4.15 comes with support for version 12.12.1c of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.12.1c
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.