bremss, vbremss, zbremss: thermal bremsstrahlung

A thermal bremsstrahlung spectrum based on the Kellogg, Baldwin  & Koch (ApJ 199, 299) polynomial fits to the Karzas & Latter (ApJS 6, 167) numerical values. A routine from Kurucz (private communication) is used in at low temperature end. The He abundance is assumed to be 8.5 % of H by number.

Choice of fixed redshift is allowed by using zbremss variant

Choice of Hydrogen to Helium  abundance ratio is allowed by using the vbremss variant.

 

The parameter settings are thus:

 

For bremss:

par1	plasma temperature in keV
norm	, where D is the distance to the source (cm) and ne, nI are the electron and ion densities (cm-3)

For zbremss:

par1	plasma temperature in keV
par2 = z	redshift
norm	, where D is the distance to the source (cm) and ne, nI are the electron and ion densities (cm-3)

For vbremss:

par1	plasma temperature in keV
par2	n(He)/n(H) (note that the Solar ratio is 0.085)
norm	, where D is the distance to the source (cm) and ne, nI are the electron and ion densities (cm-3)