2011/12/07 by R. Jurek, Russell Jurek
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Galaxy #Line (geometry) #Matched filter #Noise (video) #Pathfinder #Radio Astronomy Observations and Technology #Representation (politics) #Square (algebra) #astro-ph.IM
paper · pdf · doi:10.1071/as11044
Part of the 2012 PASA Source Finding Special Issue, 10 figures
arxiv created 2011/12/07 · openalex publication_date 2012/01/01 · arxiv updated 2015/06/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 H i ( cnhi ) source finder, which employs a novel implementation of matched filtering. This implementation is optimised for the 3-D nature of the H i 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 H i galaxies out to z ∼0.2.