Weekly Report 12Nov2010

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Pixon Albedo Imaging Results

Using Eduard Kontar's simulated eventlist files, Pixon Images were created for a compact circular gaussian source with an albedo near disk center, and near the limb. The following parameters were used for each image:

In each Image below the following convention was used:

The Contours levels used were: 1%, 3%, 5%, 10%, 30%, 50%, 70%, and 90%.

The plots below each image show the flux of a pixel as a function of the distance from the centroid of the source. It is a modification of looking at the flux along a single line through the image. In this method every pixel is plotted so the entire image can be viewed. The following conventions were used in all radial profile plots:

Simulated source closer to disc center(X = 301 arcsec, Y= 0 arcsec)

The following images and plots of the flux are for the simulated source near the disc center.

The following image is for the source near disc center with the lowest number of total counts, approximately 10^4 ph/cm^2/sec.

The above shows the original data map(background image), the clean contours (Blue), and the pixon contours (White), for ~10^4 total counts in the image.

Both imaging techniques produce an elliptical source around the centroid of the original data map. The Pixon image breaks up into multiple smaller sources at the centroid. Neither method reproduces a symmetrical albedo contribution away from the centroid of the image. This may be due to the low number of counts away from the compact source.


Flux 301 low avg.jpg
The above shows the original data map(background image), the clean contours (Blue), and the pixon contours (White), for ~10^5 total counts in the image.
Flux 301 mid avg.jpg
The above shows the original data map(background image), the clean contours (Blue), and the pixon contours (White), for ~10^6 total counts in the image.
Flux 301 high avg.jpg


Simulated source near the limb (X = 930 arcsec, Y = 0 arcsec)

The above shows the original data map(background image), the clean contours (Blue), and the pixon contours (White), for ~10^4 total counts in the image.
Flux 930 low avg.jpg
The above shows the original data map(background image), the clean contours (Blue), and the pixon contours (White), for ~10^5total counts in the image.
Flux 930 mid avg.jpg
The above shows the original data map(background image), the clean contours (Blue), and the pixon contours (White), for ~10^6 total counts in the image.
Flux 930 high avg.jpg



RHESSI Imaging Algorithm Test - Clean

Two sources same flux clean.jpg
Dif map2.jpg
Dif map slice.jpg

RHESSI Website Migration Update

Goals for next week

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