Comparison of Potential ASKAP Hi Survey Source Finders
A. Popping A E , R. Jurek B , T. Westmeier A , P. Serra A , L. Flöer D , M. Meyer A and B. Koribalski BA International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
B Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia
C Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA Dwingeloo, The Netherlands
D Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
E Corresponding author. Email: attila.popping@icrar.org
Publications of the Astronomical Society of Australia 29(3) 318-339 https://doi.org/10.1071/AS11067
Submitted: 8 November 2011 Accepted: 19 January 2012 Published: 24 February 2012
Journal Compilation © Astronomical Society of Australia 2012
Abstract
The large size of the ASKAP Hi surveys DINGO and WALLABY necessitates automated 3D source finding. A performance difference of a few percent corresponds to a significant number of galaxies being detected or undetected. As such, the performance of the automated source finding is of paramount importance to both of these surveys. We have analysed the performance of various source finders to determine which will allow us to meet our survey goals during the DINGO and WALLABY design studies. Here we present a comparison of the performance of five different methods of automated source finding. These source finders are duchamp, gamma-finder, a cnhi finder, a 2d–1d wavelet reconstruction finder and a sigma clipping method (s+c finder). Each source finder was applied to the same three-dimensional data cubes containing (a) point sources with a Gaussian velocity profile and (b) spatially extended model-galaxies with inclinations and rotation profiles. We focus on the completeness and reliability of each algorithm when comparing the performance of the different source finders.
Keywords: methods: data analysis
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