A High Stellar Velocity Dispersion and ~100 Globular Clusters for the Ultra Diffuse Galaxy Dragonfly 44

@article{Dokkum2016AHS,
  title={A High Stellar Velocity Dispersion and ~100 Globular Clusters for the Ultra Diffuse Galaxy Dragonfly 44},
  author={Pieter G. van Dokkum and Roberto G. Abraham and Jean P. Brodie and Charlie Conroy and Shany Danieli and Allison T. Merritt and Lamiya Mowla and Aaron J. Romanowsky and Jielai Zhang},
  journal={The Astrophysical Journal},
  year={2016},
  volume={828}
}
  • Pieter G. van Dokkum, Roberto G. Abraham, +6 authors Jielai Zhang
  • Published 2016
  • Physics
  • The Astrophysical Journal
  • Recently a population of large, very low surface brightness, spheroidal galaxies was identified in the Coma cluster. The apparent survival of these Ultra Diffuse Galaxies (UDGs) in a rich cluster suggests that they have very high masses. Here we present the stellar kinematics of Dragonfly 44, one of the largest Coma UDGs, using a 33.5 hr integration with DEIMOS on the Keck II telescope. We find a velocity dispersion of 47 km/s, which implies a dynamical mass of M_dyn=0.7x10^10 M_sun within its… CONTINUE READING

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