Weekly Report 25Mar2011

RHESSI Albedo Imaging Test

The RHESSI Albedo Imaging test continued.

The following steps were attempted with Pixon:

• Pixon images were made from maps that contained two circular Gaussian sources.
• The sources were centered at locations 4 arcsecs apart.
• One source was compact (standard deviation of 2 arcsecs) while the other was extended.
• Pixon images were made with three detector combinations 1-9, 1-4, and 4-9.

The table below shows the detector combinations

Original Map Configuration	Imaging Algorithm	Detectors Used	Image Centroid X	Image Centroid Y	ST DEV X	ST DEV Y
Two Circular Gaussian Sources (offset by 4 arcsec)	Pixon	1 to 9	907.47	256.34	9.64	9.64
Two Circular Gaussian Sources (offset by 4 arcsec)	Pixon	4 to 9	907.21	256.18	9.38	9.56
Two Circular Gaussian Sources (offset by 4 arcsec)	Pixon	1 to 4	910.37	255.26	2.27	2.12
Two Circular Gaussian Sources (offset by 4 arcsec)	Clean	1 to 9	907.59	256.18	8.98	9.02
Two Circular Gaussian Sources (offset by 4 arcsec)	Clean	1 to 4	910.87	255.92	5.97	5.82
Two Circular Gaussian Sources (offset by 4 arcsec)	Clean	4 to 9	907.83	256.21	9.75	9.83

The plot shows the flux profiles of images made with Pixon from a map with two offset Gaussian sources, one with a standard deviation of two arcsecs and one with a standard deviation of 10 arcsec. The seperation of the two sources is 4 arcsecs. The plots were made from images using detectors 1 to 9, detectors 1 to 4, and detectors 4 to 9.