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Dwarf Spheroidal Galaxies in the M101 Group and Behind it

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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 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 NGC5485/5473. 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.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Moscow, Russia

    I. D. Karachentsev & L. N. Makarova

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  1. I. D. Karachentsev
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  2. L. N. Makarova
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Correspondence to I. D. Karachentsev.

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Translated from Astrofizika, Vol. 62, No. 3, pp. 329-336 (August 2019)

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Karachentsev, I.D., Makarova, L.N. Dwarf Spheroidal Galaxies in the M101 Group and Behind it. Astrophysics 62, 293–299 (2019). https://doi.org/10.1007/s10511-019-09582-7

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  • DOI: https://doi.org/10.1007/s10511-019-09582-7

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