powerlaw, zpowerlw: power law photon spectrum
powerlaw is a simple photon power law. The zpowerlw variant computes a redshifted spectrum.
|
par1 = a |
photon index of power law (dimensionless) |
|
norm= K |
photons keV–1cm–2s–1 at 1 keV |
For zpowerlw the formula and corresponding parameters are:
![A(E) = K[E(1+z)^-alpha]/(1+z)](XSmodelPowerlaw_files/image002.gif){kind=small}
where :
|
par1= a |
photon index of power law (dimensionless) |
|
par2= z |
Redshift |
|
norm= K |
photons keV–1cm–2s–1 at 1 keV |