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            wndabs, zwndabs: photo-electric absorption, warm absorber

Photo-electric absorption from approximation to a warm absorber using Balucinska,-Church, and McCammon (ApJ 400, 699) cross-sections. Relative abundances are set by the abund command.

M(E) =

1                                  E > EW

exp[-n_H*sigma(E)]  E<= E_W

 

where s(E) is the photo-electric cross-section (NOT including Thomson

scattering) and

par1= nH

equivalent hydrogen column (in units of 1022 atoms cm–2)

par2= EW

window energy (keV)

The zwndabs variant allows the user to specify a (fixed) redshift and uses the corresponding formula:

M(E) =

exp[-n_H*sigma(E[1+z])]  E<= E_W

1                                              E > EW

with parameters:

par1= nH

equivalent hydrogen column (in units of 1022 atoms cm–2)

par2= EW

window energy (keV)

par3= z

redshift


 

next up previous contents
Next: Xion Up: Multiplicative Model Components Previous: Wabs