XSvnpshock

class sherpa.astro.xspec.XSvnpshock(name='vnpshock')

Bases: sherpa.astro.xspec.XSAdditiveModel

The XSPEC vnpshock model: shocked plasma, plane parallel, separate ion, electron temperatures.

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_a

The mean shock temperature, in keV.

kT_b

The electron temperature immediately behind the shock front, in keV. See [1] for a discussion of the behavior of kT_a and kT_b.

H

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

He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni

The abundance of the element, with respect to Solar.

Tau_l

The lower limit on the ionization timescale in s/cm^3.

Tau_u

The upper limit on the ionization timescale in s/cm^3.

redshift

The redshift of the source.

norm

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

See also

XSequil, XSnpshock, XSvvnpshock

References

[1]	(1, 2, 3) https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelNpshock.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()