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Issue A&A
Volume 416, Number 1, March II 2004
Page(s) 391 - 401
Section Instruments, observational techniques, and data processing
DOI http://dx.doi.org/10.1051/0004-6361:20034619



A&A 416, 391-401 (2004)
DOI: 10.1051/0004-6361:20034619

Automatic detection of arcs and arclets formed by gravitational lensing

F. Lenzen1, S. Schindler2 and O. Scherzer1

1  Institute of Computer Science, University of Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
2  Institute for Astrophysics, University of Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria

(Received 10 July 2003 / Accepted 13 November 2003 )

Abstract
We present an algorithm developed particularly to detect gravitationally lensed arcs in clusters of galaxies. This algorithm is suited for automated surveys as well as individual arc detections. New methods are used for image smoothing and source detection. The smoothing is performed by so-called anisotropic diffusion, which maintains the shape of the arcs and does not disperse them. The algorithm is much more efficient in detecting arcs than other source finding algorithms and the detection by eye.


Key words: methods: data analysis -- techniques: image processing -- galaxies: clusters: general -- gravitational lensing

Offprint request: F. Lenzen, Frank.Lenzen@uibk.ac.at

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