Radio Source Extraction with ProFound
  In the current era of radio astronomy, continuum surveys observe a multitude
of objects with complex morphologies and sizes, and are not limited to
observing point sources. Typical radio source extraction software generates
catalogues by using Gaussian components to form a model of the emission. This
may not be well suited to complicated jet structures and extended emission,
particularly in the era of interferometers with a high density of short
baselines, that are sensitive to extended emission. In this paper, we
investigate how the optically-motivated source detection package ProFound
(Robotham et al. 2018) may be used to model radio emission of both complicated
and point-like radio sources. We use a combination of observations and
simulations to investigate how ProFound compares to other source extractor
packages used for radio surveys. We find that ProFound can accurately recover
both the flux densities of simulated Gaussian sources as well as extended radio
galaxies. ProFound can create models that trace the complicated nature of these
extended galaxies, which we show is not necessarily the case with other source
extraction software. Our work suggests that our knowledge of the emission from
extended radio objects may be both over or under-estimated using traditional
software. We suggest that ProFound offers a useful alternative to the fitting
of Gaussian components for generating catalogues from current and future radio
surveys. Furthermore, ProFound's multi-wavelength capabilities will be useful
in investigating radio sources in combination with multiwavelength data.
