Synopsis
The XSPEC bvrnei model: velocity-broadened non-equilibrium recombining collisional plasma.
Syntax
xsbvrnei The xsbvrnei model is an additive model component.
Description
The model is described at [1] . The set_xsxset and get_xsxset functions are used to set and query the XSPEC XSET parameters, in particular the keyword "NEIVERS".
Example
>>> create_model_component("xsbvrnei", "mdl")
>>> print(mdl)Create a component of the xsbvrnei model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.kT thawed 0.5 0.0808 79.9 keV mdl.kT_init thawed 1 0.0808 79.9 keV mdl.H frozen 1 0 1 mdl.He frozen 1 0 1000 mdl.C frozen 1 0 1000 mdl.N frozen 1 0 1000 mdl.O frozen 1 0 1000 mdl.Ne frozen 1 0 1000 mdl.Mg frozen 1 0 1000 mdl.Si frozen 1 0 1000 mdl.S frozen 1 0 1000 mdl.Ar frozen 1 0 1000 mdl.Ca frozen 1 0 1000 mdl.Fe frozen 1 0 1000 mdl.Ni frozen 1 0 1000 mdl.Tau thawed 1e+11 1e+08 5e+13 s/cm^3 mdl.Redshift frozen 0 -0.999 10 mdl.Velocity frozen 0 0 1e+06 km/s mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
kT
The temperature of the plasma, in keV.
kT_init
The initial temperature of the plasma, in keV.
H, He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni
The abundance of the element in solar units.
Tau
The ionization timescale in units of s/cm^3.
Redshift
The redshift of the plasma.
Velocity
The gaussian sigma of the velocity broadening, in km/s.
norm
The normalization of the model: see [1] for an explanation of the units.
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelBrnei.html
XSPEC version
CIAO 4.12 comes with support for version 12.10.1n of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.10.1n
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.