The hyperluminous X-ray source candidate in IC 4320: another HLX bites the dust

@article{Sutton2015TheHX,
  title={The hyperluminous X-ray source candidate in IC 4320: another HLX bites the dust},
  author={Andrew D. Sutton and Timothy P. Roberts and Jeanette Claire Gladstone and Dominic J. Walton University of Durham and Marshall Space Flight Center and University of Alberta and California Institute of Technology.},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2015},
  volume={450},
  pages={787-793}
}
The known members of the class of hyperluminous X-ray sources (HLXs) are few in number, yet they are of great interest as they are regarded as the likeliest intermediate-mass black hole (IMBH) candidates amongst the wider population of ultraluminous X-ray sources (ULXs). Here we report optical photometry and spectroscopy of an HLX candidate associated with the galaxy IC 4320, that reveal it is a background AGN. We discuss the implications of the exclusion of this object from the small number of… Expand

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