The Characterised Noise Hi Source Finder: Detecting Hi Galaxies Using a Novel Implementation of Matched Filtering
R. JurekCSIRO Astronomy & Space Sciences, Australia Telescope National Facility, PO Box 76, Epping NSW 1710, Australia. Email: russell.jurek@csiro.au
Publications of the Astronomical Society of Australia 29(3) 251-261 https://doi.org/10.1071/AS11044
Submitted: 8 September 2011 Accepted: 8 November 2011 Published: 4 January 2012
Journal Compilation © Astronomical Society of Australia 2012
Abstract
The spectral line datacubes obtained from the Square Kilometre Array (SKA) and its precursors, such as the Australian SKA Pathfinder (ASKAP), will be sufficiently large to necessitate automated detection and parametrisation of sources. Matched filtering is widely acknowledged as the best possible method for the automated detection of sources. This paper presents the Characterised Noise Hi (cnhi) source finder, which employs a novel implementation of matched filtering. This implementation is optimised for the 3-D nature of the Hi spectral line observations of the planned Wide-field ASKAP Legacy L-band All-sky Blind surveY (WALLABY). The cnhi source finder also employs a novel sparse representation of 3-D objects, with a high compression rate, to implement the Lutz one-pass algorithm on datacubes that are too large to process in a single pass. WALLABY will use ASKAP's phenomenal 30 square degree field of view to image ~70% of the sky. It is expected that WALLABY will find 500 000 Hi galaxies out to z ~ 0.2.
Keywords: methods: data analysis — methods: statistical — radio lines: galaxies — techniques: image processing
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