Synopsis
The XSPEC jet model: Leptonic relativistic jet model.
Syntax
xsjet The xsjet model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsjet", "mdl")
>>> print(mdl)Create a component of the xsjet model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.mass frozen 1e+09 1 1e+10 solar mdl.Dco frozen 3350.6 1 1e+08 Mpc mdl.log_mdot thawed -1 -5 2 logL/LEdd mdl.thetaobs frozen 3 0 90 deg mdl.BulkG frozen 13 1 100 mdl.phi frozen 0.1 0.01 100 rad mdl.zdiss frozen 1275 10 10000 Rg mdl.B frozen 2.6 0.01 15 Gau mdl.logPrel frozen 43.3 40 48 mdl.gmin_inj frozen 1 1 1000 mdl.gbreak frozen 300 10 10000 mdl.gmax frozen 3000 1000 1e+06 mdl.s1 frozen 1 -1 1 mdl.s2 frozen 2.7 1 5 mdl.z frozen 0 0 10 mdl.norm frozen 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| mass | Black hole mass, in solar masses. |
| Dco | Comoving distance, as in XSoptxagnf. |
| log_mdot | log (accretion power / Eddington luminosity), in units of log L / logLEdd. See [1] for a full discussion of this parameter. |
| thetaobs | The inclination angle (deg) between the jet axis and line of sight. |
| BulkG | Bulk lorentz factor of the jet. |
| phi | The angular size scale - in radians - of the jet acceleration region as seen from the black hole. See [1] for more details. |
| zdiss | The vertical distance from the black hole of the jet dissipation region, in units of Rg=GM/c^2. See [1] for more details. |
| B | The magnetic field (in Gauss) in the jet. |
| logPrel | The log of the power injected in relativisitic particles, which is measured in ergs/s. |
| gmin_inj | The minimum lorentz factor of the injected electrons. |
| gbreak | The lorentz factor of the break in injected electron distribution. |
| gmax | The maximum lorentz factor. |
| s1 | The injected index of the electron distribution below the break. |
| s2 | The injected index of the electron distribution above the break. |
| z | The cosmological redshift corresponding to the Dco parameter. |
| norm | MUST BE FIXED AT UNITY as the jet spectrum normalisation is set by the relativisitic particle power. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelJet.html
XSPEC version
CIAO 4.17 comes with support for version 12.14.0k of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.14.0k
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.