
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 npshock model the parameters are:
par1  Mean shock temperature (keV) 
par2  Electron temperature immediately behind the shock front (keV) 
par3  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 
par4  Lower limit on ionization timescale in units of s/cm. 
par5  Upper limit on ionization timescale in units of s/cm. 
par6  redshift 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the vnpshock model, the parameters are:
par1  Mean shock temperature (keV) 
par2  Electron temperature immediately behind the shock front (keV) 
par3  H abundance (set to 0 for no freefree continuum, otherwise 1) 
par4–par15  Abundances for He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command) 
par16  Lower limit on ionization timescale in units of s/cm. 
par17  Upper limit on ionization timescale in units of s/cm. 
par18  Redshift, z 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the vvnpshock model, the parameters are:
par1  Mean shock temperature (keV) 
par2  Electron temperature immediately behind the shock front (keV) 
par3  H abundance (set to 0 for no freefree continuum, otherwise 1) 
par4–par32  Abundances for all elements with 2 Z 30 wrt Solar (defined by the abund command) 
par33  Lower limit on ionization timescale in units of s/cm. 
par34  Upper limit on ionization timescale in units of s/cm. 
par35  Redshift, z 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the bnpshock model, the parameters are:
par1  Mean shock temperature (keV) 
par2  Electron temperature immediately behind the shock front (keV) 
par3  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 
par4  Lower limit on ionization timescale in units of s/cm. 
par5  Upper limit on ionization timescale in units of s/cm. 
par6  redshift 
par7  gaussian velocity broadening (sigma in km/s) 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the bvnpshock model, the parameters are:
par1  Mean shock temperature (keV) 
par2  Electron temperature immediately behind the shock front (keV) 
par3  H abundance (set to 0 for no freefree continuum, otherwise 1) 
par4–par15  Abundances for He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command) 
par16  Lower limit on ionization timescale in units of s/cm. 
par17  Upper limit on ionization timescale in units of s/cm. 
par18  Redshift, z 
par19  gaussian velocity broadening (sigma in km/s) 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
Finally, for the bvvnpshock model, the parameters are:
par1  Mean shock temperature (keV) 
par2  Electron temperature immediately behind the shock front (keV) 
par3  H abundance (set to 0 for no freefree continuum, otherwise 1) 
par4–par32  Abundances for all elements with 2 Z 30 wrt Solar (defined by the abund command) 
par33  Lower limit on ionization timescale in units of s/cm. 
par34  Upper limit on ionization timescale in units of s/cm. 
par35  Redshift, z 
par36  gaussian velocity broadening (sigma in km/s) 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
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Last modified: Friday, 23Aug2024 13:20:40 EDT