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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 cosmic). 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 $(10^{-14}/(4\pi[D_A(1+z)]^2))\int n_en_H dV$, where $D_A$ is the angular diameter distance to the source (cm), $n_e$ is the electron density (cm$^{-3}$), and $n_H$ is the hydrogen density (cm$^{-3}$).

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 $(10^{-14}/(4\pi[D_A(1+z)]^2))\int n_en_H dV$, where $D_A$ is the angular diameter distance to the source (cm), $n_e$ is the electron density (cm$^{-3}$), and $n_H$ is the hydrogen density (cm$^{-3}$).

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 $(10^{-14}/(4\pi[D_A(1+z)]^2))\int n_en_H dV$, where $D_A$ is the angular diameter distance to the source (cm), $n_e$ is the electron density (cm$^{-3}$), and $n_H$ is the hydrogen density (cm$^{-3}$).


next up previous contents
Next: raymond, vraymond: emission, hot Up: Additive Model Components Previous: powerlaw, zpowerlw: power law