Detector Source Centroids

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Introduction

RHESSI consists of 9 separate detectors which each image at different spatial resolutions. The simplest form of "imaging" consists of extracting the source centroid. For a point source, source centroids for each detector are expected to agree with each other. Disagreement may imply that the source is not a point source and that structure exists at the spatial resolution of a particular detector. It is therefore of interest to compare source centroids from different detectors.

In the following analysis, source centroids were determined by making back-projection images for each detector separately and for a combination of detectors. The map_evaluator function was then applied to each image to determine the source centroid. This function determines the source centroid by fitting a paraboloid to the peak of the image. This method has the advantage of also returning errors on the centroid position.

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