Weekly Report 27Aug2010

From RHESSI Wiki

(Difference between revisions)
Jump to: navigation, search
(New page: ===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 HES...)
Line 4: Line 4:
====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 FWHM held constant====   
-
[[Image:Vis red chi fwhm.jpg‎|center|thumb|600px|]]
+
[[Image:Vis red chi fwhm.jpg‎|center|thumb|600px|The reduced chi2 as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.]]
-
[[Image:Vis tot c fwhm.jpg|center|thumb|600px|]]
+
[[Image:Vis tot c fwhm.jpg|center|thumb|600px|The total C statistic as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.]]
-
[[Image:Vis det c fwhm.jpg‎|center|thumb|600px|]]
+
[[Image:Vis det c fwhm.jpg‎|center|thumb|600px|The C statistic of each detector as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.]]
====Visibility Forward Fit - the reduced chi2 and C statistic for reconstructed images with the flux held constant====  
====Visibility Forward Fit - the reduced chi2 and C statistic for reconstructed images with the flux held constant====  
-
[[Image:Vis flux red chi.jpg|center|thumb|600px|]]
+
[[Image:Vis flux red chi.jpg|center|thumb|600px|The reduced chi2 as a function of the flux for a reconstructed image using visibility forward fit with a circular gaussian model.]]
-
[[Image:Vis flux tot c.jpg‎ |center|thumb|600px|]]
+
[[Image:Vis flux tot c.jpg‎ |center|thumb|600px|The total C statistic as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.]]
-
[[Image:Vis flux det c.jpg|center|thumb|600px|]]
+
[[Image:Vis flux det c.jpg|center|thumb|600px|The C statistic of each detector as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.]]

Revision as of 18:17, 27 August 2010

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

The reduced chi2 as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.
The total C statistic as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.
The C statistic of each detector as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.

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

The reduced chi2 as a function of the flux for a reconstructed image using visibility forward fit with a circular gaussian model.
The total C statistic as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.


The C statistic of each detector as a function of the FWHM for a reconstructed image using visibility forward fit with a circular gaussian model.
Personal tools
Namespaces
Variants
Actions
Navigation
Toolbox