Model to aid estimating photon fluxes and errors
NOTE: This model is now in the Xspec release and this page is superceded by the Xspec manualThis convolution model can be used with any other combination of models in order to estimate the photon flux and errors. The first two parameters are the minimum and maximum energy (in keV) over which the flux is calculated. These parameters must be frozen. The third parameter is the photon flux in photons/cm^2/s. It is important to ensure that the energy range over which the model is calculated (which is determined by the response matrix in use) covers the energy range for which the photon flux is calculated. To use this model place the cpflux component immediately in front of the component(s) for which you want to estimate the photon flux and fix the normalization parameter of
with the normalizaton of the power-law model fixed gives the photon flux and error on the entire model.
again with the normalization of the power-law fixed gives the unabsorbed photon flux and error. Finally,
with the normalizaton of the gaussian fixed gives the photon flux and error on the gaussian component.
Keith Arnaud, Lab. for High Energy Astrophysics, NASA/Goddard Space Flight Center
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