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            bkn2pow: broken power law, 2 break energies

A three-segment broken power law (ie with two break energies).

A(E)=

KE^(-gamma_1)

E £ Ebreak,1

KE_break1^(gamma_2-gamma_1)  * (E/1keV)^-gamma_2

Ebreak,1 ≤ E ≤ Ebreak,2

KE_break1^(gamma_2-gamma_1)*E_break2^(gamma_3-gamma_2)*(E/1keV)^-gamma_3

Ebreak,2 ≤ E

where :

par1=gamma_1

power law photon index for E < Ebreak,1

par2=Ebreak,1

first break point for the energy, keV

par3=gamma_2

power law photon index for Ebreak,1 < E < Ebreak,2

par4=Ebreak,2

second break point for the energy, keV

par5=gamma_3

power law photon index for E > Ebreak,2

Norm =K

photons keV-1cm-2s-1 at 1 keV


 

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