Attila Popping, Russell Jurek, Tobias Westmeier, Paolo Serra, Lars Floer, Martin Meyer, Baerbel Koribalski
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, the Gamma-finder, CNHI, a 2D-1D Wavelet
Reconstruction and S+C finder, a sigma clipping method. Each source finder was
applied on 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.
View original:
http://arxiv.org/abs/1201.3994
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