Weekly Report 27Aug2010

Visibility Forward Fit - The reduced chi2 and C stastistic (again)

In the following studies an eventlist file for a simulated point source at disk center was used as input to the HESSI image object. RHESSI images were reconstructed from this file using the visibility forward fit algorithm. In all cases below the model of the reconstructed image was a circular gaussian. All parameters of the model were allowed to vary for up to 2000 iterations or until the lowest reduced chi2 was achieved except for one. In the first case the full width half max (FWHM) was held fixed at values ranging from .1 arcsecs to 3 arcsecs. In the second the flux was held fixed at values ranging from 1 photon/cm2/sec to 40 photons/cm2/sec. The reduced chi2, the total C statistic, and the C statistic for each detector were calculated at each point.

Visibility Forward Fit - the reduced chi2 and C statistic for reconstructed images with the FWHM held constant

Visibility Forward Fit - the reduced chi2 and C statistic for reconstructed images with the flux held constant