XSvvgnei

class sherpa.astro.xspec.XSvvgnei(name='vvgnei')[source] [edit on github]

Bases: sherpa.astro.xspec.XSAdditiveModel

The XSPEC vvgnei model: collisional plasma, non-equilibrium, temperature evolution.

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”.

Note

Deprecated in Sherpa 4.10.0

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

kT

The temperature of the plasma, in keV.

H

The H abundance: it should be set to 0 to switch on and 1 to switch off the free-free continuum.

He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar,
K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn

The abundance of the element, with respect to Solar.

Tau

The ionization timescale in units of s/cm^3.

meankT

The ionization timescale averaged plasma temperature in keV.

redshift

The redshift of the plasma.

norm

The normalization of the model: see [1] for an explanation of the units.

References

[1](1, 2) https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelGnei.html

Attributes Summary

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars
version_enabled

Methods Summary

apply(outer, *otherargs, **otherkwargs)
calc(pars, xlo, *args, **kwargs)
get_center()
guess(dep, *args, **kwargs) Set an initial guess for the parameter values.
regrid(*arrays)
reset()
set_center(*args, **kwargs)
startup() Called before a model may be evaluated multiple times.
teardown() Called after a model may be evaluated multiple times.

Attributes Documentation

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars
version_enabled = True

Methods Documentation

apply(outer, *otherargs, **otherkwargs) [edit on github]
calc(pars, xlo, *args, **kwargs) [edit on github]
get_center() [edit on github]
guess(dep, *args, **kwargs) [edit on github]

Set an initial guess for the parameter values.

Attempt to set the parameter values, and ranges, for the model to match the data values. This is intended as a rough guess, so it is expected that the model is only evaluated a small number of times, if at all.

regrid(*arrays) [edit on github]
reset() [edit on github]
set_center(*args, **kwargs) [edit on github]
startup() [edit on github]

Called before a model may be evaluated multiple times.

See also

teardown()

teardown() [edit on github]

Called after a model may be evaluated multiple times.

See also

setup()