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The abundance of satellite dwarf galaxies has long been considered a crucialtest for the current model of cosmology leading to the well-known missingsatellite problem. Recent advances in both simulations and observations haveallowed to study dwarf galaxies around host galaxies in more detail. We havesurveyed a 72 deg2 area of the nearby Sculptor group using the Dark EnergyCamera - also encompassing the two low-mass Local Volume galaxies NGC24 andNGC45 residing behind the group - to search for hitherto undetected dwarfgalaxies. Apart from the previously known dwarf galaxies we have found only twonew candidates down to a 3 sigma surface brightness detection limit of 27.4 rmag arcsec-2. Both systems are in projection close to NGC24. However, one ofthese candidates could be an ultra-diffuse galaxy associated to a backgroundgalaxy. We compared the number of known dwarf galaxy candidates around NGC24,NGC45, and five other well-studied low-mass giant galaxies (NGC 1156, NGC2403,NGC5023, M33, and the LMC) with predictions from cosmological simulations andfound that for the stellar-to-halo mass models considered, the observedsatellite numbers tend to be on the lower end of the expected range. This couldeither mean that there is an over-prediction of luminous subhalos in LambdaCDMor - and more likely - that we are missing some of the satellite members due toobservational biases.

The abundance of dwarf galaxies around low-mass giants in the Local Volume