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            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

3.02*10^-15/(4*pi*D^2) * [intg](n_e*n_I dV), 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

3.02*10^-15/(4*pi*D^2) * [intg](n_e*n_I dV), 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

3.02*10^-15/(4*pi*D^2) * [intg](n_e*n_I dV), where D is the distance to the source (cm) and ne, nI are the electron and ion densities (cm-3)

 


 

next up previous contents
Next: Bvapec Up: Additive Model Components Previous: Bmc