A possible formation scenario for the ultramassive cluster W3 in NGC 7252

  title={A possible formation scenario for the ultramassive cluster W3 in NGC 7252},
  author={Michael Fellhauer and Pavel Kroupa},
  journal={Monthly Notices of the Royal Astronomical Society},
The intermediate age star cluster W3 (age � 300‐500 Myr) in NGC 7252 is the most luminous star cluster known to date with a dynamical mass estimate of 8±2·10 7 M⊙. With an effective radius of about 17.5 pc and a velocity dispersion of 45 kms −1 this object may be viewed as one of the recently discovered ultra-compact dwarf galaxies (UCDs). Its intermediate age, however, precludes an origin as a stripped nucleated dwarf elliptical galaxy. The galaxy NGC 7252 is a merger remnant from two gas-rich… 

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