An X-ray emitting black hole in a globular cluster

T. J. MacCarone, G. Bergond, A. Kundu, K. L. Rhode, J. J. Salzer, I. C. Shih, S. E. Zepf

Research output: Contribution to journalArticlepeer-review


We present optical and X-ray data for the first object showing strong evidence for being a black hole in a globular cluster. We show the initial X-ray light curve and X-ray spectrum which led to the discovery that this is an extremely bright, highly variable source, and thus must be a black hole. We present the optical spectrum which unambiguously identifies the optical counterpart as a globular cluster, and which shows a strong, broad [O III] emission line, most likely coming from an outflow driven by the accreting source.

Original languageEnglish
Pages (from-to)336-340
Number of pages5
JournalProceedings of the International Astronomical Union
Issue numberS246
StatePublished - Sep 2007


  • Galaxies: individual (NGC 4472)
  • Globular clusters: general
  • X-ray: binaries


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