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meka, vmeka: emission, hot diffuse gas
(Mewe-Gronenschild)
An emission spectrum from hot diffuse gas based on the model calculations of Mewe and Gronenschild (as amended by Kaastra). The model includes line emissions from several elements. Abundances are the number of nuclei per Hydrogen nucleus relative to the Solar abundances set by the abund command.
For the meka model the parameters are:
par1 | plasma temperature in keV |
par2 | H density (cm |
par3 | Metal abundances (He fixed at that defined by the abund command). The elements included are C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, Ni. Relative abundances are set by the abund command. |
par4 | Redshift, z |
norm |
|
For the vmeka variant the parameters are as follows.
par1 | plasma temperature in keV |
par2 | H density (cm |
par3–par14 | Abundances for He, C, N, O, Ne, Mg, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command). |
par15 | redshift, z |
norm |
|
The references for the meka model are as follows :
Mewe, Gronenschild & van den Oord (1985)
Mewe, Lemen, & van den Oord (1986)
Kaastra, J.S. 1992, An X-Ray Spectral Code for Optically Thin Plasmas
(Internal SRON-Leiden Report, updated version 2.0)
Similar credit may also be given for the adopted ionization balance:
Arnaud & Rothenflug (1985)
Arnaud & Raymond (1992)