agauss, zagauss:  gaussian line profile in wavelength space

A simple gaussian line profile. If the width is ≤ 0 then it is treated as a delta function. The zagauss variant computes a redshifted gaussian.

                  

where:

par1 = λl	line wavelength in Angstrom
par2 = s	line width in Angstrom
Norm = K	total photons cm-2 s-1 in the line

 

For zagauss the corresponding formula is:

              

and parameter settings are:

par1 = λl	line wavelength in Angstrom
par2 = σ	line width in Angstrom
par3 = z	redshift
Norm = K	total photons cm–2s–1 in the line