
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 sedov 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  Ionization age (s/cm) of the remnant (= electron density immediately behind the shock front multiplied by the age of the remnant). 
par5  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 vsedov 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) 
par4par15  Abundances for He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command) 
par16  Ionization age (s/cm) of the remnant (= electron density immediately behind the shock front multiplied by the age of the remnant). 
par17  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 vvsedov 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) 
par4par32  Abundances for all elements with 2 Z 30 wrt Solar (defined by the abund command) 
par33  Ionization age (s/cm) of the remnant (= electron density immediately behind the shock front multiplied by the age of the remnant). 
par34  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 bsedov 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  Ionization age (s/cm) of the remnant (= electron density immediately behind the shock front multiplied by the age of the remnant). 
par5  redshift 
par6  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 bvsedov 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) 
par4par15  Abundances for He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command) 
par16  Ionization age (s/cm) of the remnant (= electron density immediately behind the shock front multiplied by the age of the remnant). 
par17  Redshift, z 
par18  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 bvvsedov 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) 
par4par32  Abundances for all elements with 2 Z 30 wrt Solar (defined by the abund command) 
par33  Ionization age (s/cm) of the remnant (= electron density immediately behind the shock front multiplied by the age of the remnant). 
par34  Redshift, z 
par35  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: Tuesday, 28May2024 10:09:22 EDT