pshock, vpshock, vvpshock: plane-parallel shocked plasma, constant temperature

Constant temperature plane-parallel shock plasma model. The references for this model can be found under the description of the equil model. Several versions are available. To switch between them use the xset neivers command. The versions available are:

1.0	the version from xspec v11.1
1.1	as 1.0 but with updated ionization fractions using dielectronic recombination rates from Mazzotta et al (1998)
2.0	same ionization fractions as 1.1 but uses AtomDB v2 to calculate the resulting spectrum
3.x	ionization fractions and spectrum calculation uses AtomDB v3.x

Note that versions 1.x have no emission from Ar. For versions 3.x and later additional xset options are available and are listed under the documentation for nei.

For the pshock model the parameters are:

par1	Plasma temperature (keV)
par2	Metal abundances (He fixed at that defined by the abund command). The elements included are C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni. Abundances are defined by the abund command
par3	Lower limit on ionization timescale in units of s/cm$^3$.
par4	Upper limit on ionization timescale in units of s/cm$^3$.
par5	redshift
norm	${10^{-14}\over{4\pi[D_A(1+z)]^2}}\int n_en_HdV$, where $D_A$ is the angular diameter distance to the source (cm), $dV$ is the volume element (cm$^3$), and $n_e$ and $n_H$ are the electron and H densities (cm$^{-3}$), respectively

For the vpshock model, the parameters are:

par1	Plasma temperature (keV)
par2	H abundance (set to 0 for no free-free continuum, otherwise 1)
par3-par14	Abundances for He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command)
par15	Lower limit on ionization timescale in units of s/cm$^3$.
par16	Upper limit on ionization timescale in units of s/cm$^3$.
par17	Redshift, z
norm	${10^{-14}\over{4\pi[D_A(1+z)]^2}}\int n_en_HdV$, where $D_A$ is the angular diameter distance to the source (cm), $dV$ is the volume element (cm$^3$), and $n_e$ and $n_H$ are the electron and H densities (cm$^{-3}$), respectively

Finally, for the vvpshock model, the parameters are:

par1	Plasma temperature (keV)
par2	H abundance (set to 0 for no free-free continuum, otherwise 1)
par3-par31	Abundances for all elements with 2 $\leq$ Z $\leq$ 30 wrt Solar (defined by the abund command)
par32	Lower limit on ionization timescale in units of s/cm$^3$.
par33	Upper limit on ionization timescale in units of s/cm$^3$.
par34	Redshift, z
norm	${10^{-14}\over{4\pi[D_A(1+z)]^2}}\int n_en_HdV$, where $D_A$ is the angular diameter distance to the source (cm), $dV$ is the volume element (cm$^3$), and $n_e$ and $n_H$ are the electron and H densities (cm$^{-3}$), respectively