Galaxy And Mass Assembly (GAMA): detection of low-surface-brightness
  galaxies from SDSS data
  We report on a search for new low-surface-brightness galaxies (LSBGs) using
Sloan Digital Sky Survey (SDSS) data within the GAMA equatorial fields. The
search method consisted of masking objects detected with SDSS photo, combining
gri images weighted to maximise the expected signal-to-noise ratio (SNR), and
smoothing the images. The processed images were then run through a detection
algorithm that finds all pixels above a set threshold and groups them based on
their proximity to one another. The list of detections was cleaned of
contaminants such as diffraction spikes and the faint wings of masked objects.
From these, selecting potentially the brightest in terms of total flux, a list
of 343 LSBGs was produced having been confirmed using VISTA Kilo-degree
Infrared Galaxy Survey (VIKING) imaging. The photometry of this sample was
refined using the deeper VIKING Z band as the aperture-defining band. Measuring
their $g-i$ and $J-K$ colours shows that most are consistent with being at
redshifts less than 0.2. The photometry is carried out using an AUTO aperture
for each detection giving surface brightnesses of $\mu_{r} \ge 25 \,
\mathrm{mag} \, \mathrm{arcsec}^{-2}$ and magnitudes of $r > 19.8$ mag. None of
these galaxies are bright enough to be within the GAMA main survey limit but
could be part of future deeper surveys to measure the low-mass end of the
galaxy stellar mass function.
