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Assessing the Accuracy of Radio Astronomy Source-Finding Algorithms

Published online by Cambridge University Press:  02 January 2013

S. Westerlund ,
C. Harris  and
T. Westmeier
S. Westerlund*
Affiliation:
ICRAR/University of Western Australia, M468 35 Stirling Highway, Crawley, WA 6009, Australia
C. Harris
Affiliation:
ICRAR/University of Western Australia, M468 35 Stirling Highway, Crawley, WA 6009, Australia
T. Westmeier
Affiliation:
ICRAR/University of Western Australia, M468 35 Stirling Highway, Crawley, WA 6009, Australia
*
BCorresponding author. Email: stefan.westerlund@icrar.org
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Abstract

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This work presents a method for determining the accuracy of a source finder algorithm for spectral line radio astronomy data and the Source Finder Accuracy Evaluator (SFAE), a program that implements this method. The accuracy of a source finder is defined in terms of its completeness, reliability, and accuracy of the parameterisation of the sources that were found. These values are calculated by executing the source finder on an image with a known source catalogue, then comparing the output of the source finder to the known catalogue. The intended uses of SFAE include determining the most accurate source finders for use in a survey, determining the types of radio sources a particular source finder is capable of accurately locating, and identifying optimum parameters and areas of improvement for these algorithms. This paper demonstrates a sample of accuracy information that can be obtained through this method, using a simulated ASKAP data cube and the duchamp source finder.

Keywords

methods: data analysis
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 29 , Special Issue 3: Source Finding and Visualisation , 2012 , pp. 301 - 308
Copyright
Copyright © Astronomical Society of Australia 2012

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