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

Abstract

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 $(16.0\pm 6.5)M_{\odot }/L_{\odot }$, respectively. We notice that the average dark mass-to-luminosity ratio in the groups around M\,63, M\,51, and M\,101 is $(12\pm 4)M_{\odot }/L_{\odot }$ that almost an order of magnitude lower than the global cosmic ratio, $(102\pm 5)M_{\odot }/L_{\odot }$.

9 pages, 3 figures, 3 tables, 1 appendix. accepted to A&A

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Cited by in corpus (3)

• 100 Proof: HI Observations of 100 Nearby Dwarf Galaxies with the 100-meter Green Bank Telescope
• Energetic particles and high-energy processes in cosmological filaments and their astronomical implications
• Tracing satellite planes in the Sculptor group: II. Discovery of five faint dwarf galaxies in the DESI Legacy Survey