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The fine details of the large-scale structure in the local universe provideimportant empirical benchmarks for testing cosmological models of structureformation. Dwarf galaxies are key object for such studies. Enlarge the sampleof known dwarf galaxies in the local universe. We performed a search for faint,unresolved low-surface brightness dwarf galaxies in the M101 group complex,including the region around the major spiral galaxies M101, M51, and M63 lyingat a distance 7.0, 8.6, and 9.0 Mpc, respectively. The new dwarf galaxy samplecan be used in a first step to test for significant substructure in the2D-distribution and in a second step to study the spatial distribution of thegalaxy complex. Using filtering algorithms we surveyed 330 square degrees ofimaging data obtained from the Sloan Digital Sky Survey. The images werevisually inspected. The spatial distribution of known galaxies and candidateswas analyzed transforming the system into a M101 eigenframe, using thegeometrical alignment of the group. We discovered 15 new dwarf galaxies andcarried out surface photometry in the g and r bands. The similarity of thephotometric properties of these dwarfs to those of Local Group dwarfs suggestmembership to the M101 group complex. The sky distribution of the candidatesfollows the thin planar structure outlined by the known members of the threesubgroups. The ~3Mpc long filamentary structure has a rms thickness of 67 kpc.The planar structure of the embedded M101 subgroup is even thinner, with rms=46kpc. The formation of this structure might be due to the expansion of the LocalVoid to which it borders. Other implications are discussed as well. We show theviability of SDSS data to extend the sample of dwarfs in the local universe andtest cosmological models on small scales.

The M101 group complex: new dwarf galaxy candidates and spatial structure