Synopsis
The XSPEC eqpair model: Paolo Coppi's hybrid (thermal/non-thermal) hot plasma emission models.
Syntax
xseqpair The xseqpair model is an additive model component.
Description
The model is described at [1] .
Deprecated in Sherpa 4.10.0
The l_hl_s , l_ntl_h , and abhe parameters have been renamed to l_hovl_s , l_ntol_h , and ab_met respectively to match the XSPEC definition. The names l_hl_s , l_ntl_h , and abhe can still be used to access the parameters, but they will be removed in a future release.
Example
>>> create_model_component("xseqpair", "mdl")
>>> print(mdl)Create a component of the xseqpair model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.l_hovl_s thawed 1 1e-06 1e+06 mdl.l_bb thawed 100 0 10000 mdl.kT_bb frozen 200 1 400000 eV mdl.l_ntol_h thawed 0.5 0 0.9999 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 |
|---|---|
| l_hovl_s | The ratio of the hard to soft compactness, l_h / l_s. |
| l_bb | The soft photon compactness. |
| 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. |
| l_ntol_h | The fraction of power supplied to energetic particles which goes into accelerating non-thermal particles, l_nt / l_h. |
| 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
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.