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Cosmic-Ray Rejection by Laplacian Edge Detection

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arxiv astro-ph/0108003 v1 pith:KWQ7NUVQ submitted 2001-08-01 astro-ph

Pieter G. van Dokkum This is my paper · ORCID
classification astro-ph
keywords cosmic-raysalgorithmcosmic-raydetectionedgelaplacianpointrejection
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Conventional algorithms for rejecting cosmic-rays in single CCD exposures rely on the contrast between cosmic-rays and their surroundings, and may produce erroneous results if the Point Spread Function (PSF) is smaller than the largest cosmic-rays. This paper describes a robust algorithm for cosmic-ray rejection, based on a variation of Laplacian edge detection. The algorithm identifies cosmic-rays of arbitrary shapes and sizes by the sharpness of their edges, and reliably discriminates between poorly sampled point sources and cosmic-rays. Examples of its performance are given for spectroscopic and imaging data, including HST WFPC2 images.

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Cited by 11 Pith papers

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