The M101 galaxy group as a node in the nearby cosmic filament

We performed a search for faint low surface brightness dwarf galaxies around the major spiral galaxy M,101 and in the large rectangular area within SGL = [30 – 80]${}^{\circ }$, SGB =[10 – 37]${}^{\circ }$ spanning a chain of galaxies: M,63, M,51, M,101, and NGC,6503, based on the data from DESI Legacy Imaging Surveys. Six new supposed dwarf members of the complex were discovered. We present a list of 25 prospective members of the M,101 group and estimate the total mass and the total-mass-to-$K$-band luminosity ratio of the group as $(1.02\pm 0.42)\times {10}^{12}{M}_{\odot }$ and $(16.0\pm 6.5)M_{\odot }\mathrm{/}{L}_{\odot }$, respectively. We notice that the average dark mass-to-luminosity ratio in the groups around M,63, M,51, and M,101 is $(12\pm 4)M_{\odot }\mathrm{/}{L}_{\odot }$ that almost an order of magnitude lower than the global cosmic ratio, $(102\pm 5)M_{\odot }\mathrm{/}{L}_{\odot }$.