The ultra-diffuse galaxy AGC 114905 needs dark matter

  title={The ultra-diffuse galaxy AGC 114905 needs dark matter},
  author={J. A. Sellwood and R. H. Sanders},
  journal={Monthly Notices of the Royal Astronomical Society},
  • J. Sellwood, R. Sanders
  • Published 17 February 2022
  • Physics
  • Monthly Notices of the Royal Astronomical Society
Recent 21 cm line observations of the ultra-diffuse galaxy AGC 114905 indicate a rotating disc largely supported against gravity by orbital motion, as usual. Remarkably, this study has revealed that the form and amplitude of the HI rotation curve is completely accounted for by the observed distribution of baryonic matter, stars and neutral gas, implying that no dark halo is required. It is surprising to find a DM-free galaxy for a number of reasons, one being that a bare Newtonian disk having… 

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