XSvvnei

class sherpa.astro.xspec.XSvvnei(name='vvnei')

Bases: sherpa.astro.xspec.XSAdditiveModel

The XSPEC vvnei model: collisional plasma, non-equilibrium, constant temperature.

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”.

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.

redshift

The redshift of the plasma.

norm

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

See also

XSequil, XSgnei, XSnei, XSvnei

References

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

calc(pars, xlo, *args, **kwargs)

get_center()

guess(dep, *args, **kwargs)

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)

reset()

set_center(*args, **kwargs)

startup()

Called before a model may be evaluated multiple times.

See also

teardown()

teardown()

Called after a model may be evaluated multiple times.

See also

setup()