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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 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. |

par4 |
Upper limit on ionization timescale in units of s/cm. |

par5 |
redshift |

norm |
, where is
the angular diameter distance to the source (cm), is the
electron density (cm), and is the hydrogen density
(cm). |

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. |

par16 |
Upper limit on ionization timescale in units of s/cm. |

par17 |
Redshift, z |

norm |
, where is
the angular diameter distance to the source (cm), is the
electron density (cm), and is the hydrogen density
(cm). |

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 Z 30 wrt Solar (defined by the abund command) |

par32 |
Lower limit on ionization timescale in units of s/cm. |

par33 |
Upper limit on ionization timescale in units of s/cm. |

par34 |
Redshift, z |

norm |
, where is
the angular diameter distance to the source (cm), is the
electron density (cm), and is the hydrogen density
(cm). |

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**Up:** Additive Model Components
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