mekal

An emission spectrum from hot diffuse gas based on the model calculations of Mewe and Kaastra with Fe L calculations by Liedahl. The model includes line emissions from several elements. The switch parameter determines whether the mekal code will be run to calculate the model spectrum for each temperature or whether the model spectrum will be interpolated from a pre-calculated table. The former is slower but more accurate.

par1	 = 	plasma temperature in keV

par2	 = 	hydrogen density in cm 

par3	 = 	Metal abundances (He fixed at cosmic). The elements included are

		C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, Ni. Abundances are

		set by the abund command.

par4	 = 	redshift, z

par5	 =      0    calculate, 1    interpolate

K	 =	 , where D is the distance to the

		source (cm),   and  are the electron and H densities (cm  )

The references for the MEKAL model are as follows :

• Mewe, R., Gronenschild, E.H.B.M., and van den Oord, G.H.J. 1985, A&AS, 62, 197
• Mewe, R., Lemen, J.R., and van den Oord, G.H.J. 1986, A&AS, 65, 511
• 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 e.g.:

• Arnaud, M., and Rothenflug, M. 1985, A&AS, 60, 425