Hunting for low-surface brightness features in nearby galaxy groups
  On the scale of dwarf galaxies, several tensions between observations and the
theory of structure formation have been identified in the Local Group of
galaxies. One of them, the plane-of-satellite problem describes the
distribution and motion of dwarf galaxies around their hosts being planar and
co-moving. To extend these studies, we have surveyed the nearby Centaurus group
and found again evidence for co-rotation within a planar structure of dwarf
galaxies, posing a challenge to the current LambdaCDM paradigm. To further
study the distribution of satellite systems around other galaxy groups, we have
tested MTO - a program to detect astronomical sources - and found that it works
well in combination with surface brightness fluctuation distance measurements
to get a complete sample of dwarf galaxies. Such an approach will improve the
census of dwarf galaxies in nearby galaxy groups, bringing the study of the
small-scale problems to a solid statistical foundation.
