A broken power law.
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where:
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par1 = |
power law photon index for E < Ebreak |
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par2=Ebreak |
break point for the energy in keV |
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par3= |
power law photon index for E > Ebreak |
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norm=K |
photons keV-1cm-2s-1 at 1 keV} |
If POW_EMIN and POW_EMAX have been defined by the xset command then the norm becomes the flux in units of 10-12 ergs cm-2 s-1 over the energy range (POW_EMIN, POW_EMAX) keV unless POW_EMIN = POW_EMAX in which case the norm becomes the flux density in micro-Jansky at POW_EMIN keV. In these cases it is important that POW_EMIN and POW_EMAX lie within the energy range on which the model is being evaluated.
E
E
