Dwarf Spheroidal Galaxies in the M101 group and behind it

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 $(8.5\pm 3.0)\times 10^{11}{M}_{\odot }$ for the total mass of M101, which is consistent with a ratio $16\pm 6$ for the total mass to the stellar mass of the galaxy.

published in Astrophysics, v.62, p.293, 2019

References in corpus (9)

• Tip of the Red Giant Branch Distances. I. Optimization of a Maximum Likelihood Algorithm
• The discovery of seven extremely low surface brightness galaxies in the field of the nearby spiral galaxy M101
• The Dragonfly Nearby Galaxies Survey. II. Ultra diffuse galaxies near the elliptical galaxy NGC 5485
• The Dragonfly Nearby Galaxies Survey. III. The Luminosity Function of the M101 Group
• The M101 group complex: new dwarf galaxy candidates and spatial structure
• Discovery of diffuse dwarf galaxy candidates around M101
• Orbital masses of nearby luminous galaxies
• Cosmic flow around local massive galaxies
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Cited by in corpus (8)

• Solo dwarfs II: The stellar structure of isolated Local Group dwarf galaxies
• The ultraluminous X-ray source bubble in NGC 5585
• Multi-resolution filtering: an empirical method for isolating faint, extended emission in Dragonfly data and other low resolution images
• Tracing the Local Volume galaxy halo-to-stellar mass ratio with satellite kinematics
• Neutral Hydrogen Observations of Low Surface Brightness Galaxies around M101 and NGC 5485
• PAC in DESI. I. Galaxy Stellar Mass Function into the $10^6{\mathrm{M}}_{\odot }$ Frontier
• The M101 galaxy group as a node in the nearby cosmic filament
• KKH 22, the first dwarf spheroidal satellite of IC 342