|AHELP for CIAO 4.5 Sherpa v1||
Plane-parallel shock plasma model with separate ion and electron temperatures and variable abundances. XSpec model.
Plane-parallel shock plasma model with separate ion and electron temperatures. This model is slow.
kt_a provides a measure of the average energy per particle (ions + electrons) and is constant throughout the post-shock flow in plane shock models (Borkowski et al., 2001, ApJ, 548, 820). kt_b should always be less than kt_a. If kt_b exceeds kt_a then their interpretations are switched (i.e. the larger of kt_a and kt_b is always the mean temperature).
Additional references for this model can be found in the help file for the xsequil model.
This is an additive model component.
|1||kt_a||mean shock temperature in keV|
|2||kt_b||electron temperature immediately behind the shock front (keV)|
|3||h||hydrogen density in cm^-3|
|4-14||(element)||abundances for He, C, N, O, Ne, Mg, Si, S, Ca, Fe, Ni with respect to Solar. Abundances are set by the set_xsabund command.|
|15||tau_l||lower limit on ionization timescales (s/cm^3) to include|
|16||tau_u||upper limit on ionization timescales (s/cm^3) to include|
|18||norm||10^-14 / (4 pi (D_A*(1+z))^2) Int n_e n_H dV, where D_A is the angular size distance to the source (cm), n_e is the electron density (cm^-3), and n_H is the hydrogen density (cm^-3)|
This information is taken from the XSpec User's Guide. Version 12.7.1 of the XSpec models is supplied with CIAO 4.4.1.
For a list of known bugs and issues with the XSPEC models, please visit the XSPEC bugs page.
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