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We use images from the Hubble Space Telescope to determine the distances to a dozen objects with low surface brightness recently observed around the bright nearby spiral M101. Only two… Click to show full abstract
We use images from the Hubble Space Telescope to determine the distances to a dozen objects with low surface brightness recently observed around the bright nearby spiral M101. Only two dwarf galaxies, M101-DwA and M101-Dw9, turn out to be actual satellites of M101 at distances of about 7 Mpc. The other objects are probably members of a distant group around the S0-galaxies NGC 5485/5473. Based on the radial velocities and projected separations of the 9 satellites, we obtain an estimate of (8.5 ± 3.0) × 1011M⊙ for the total mass of M101, which is consistent with a ratio 16± 6 for the total mass to the stellar mass of the galaxy.
Journal Title: Astrophysics
Year Published: 2019
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