THE YOUNGEST KNOWN X-RAY BINARY: CIRCINUS X-1 AND ITS NATAL SUPERNOVA REMNANT

@article{Heinz2013THEYK,
  title={THE YOUNGEST KNOWN X-RAY BINARY: CIRCINUS X-1 AND ITS NATAL SUPERNOVA REMNANT},
  author={Sebastian Heinz and Paul H. Sell and Robert P. Fender and Peter G. Jonker and William Nielsen Brandt and D. E. Calvelo-Santos and A. K. Tzioumis and Michael A. Nowak and Norbert S. Schulz and Rudy Wijnands and Michiel van der Klis},
  journal={The Astrophysical Journal},
  year={2013},
  volume={779}
}
Because supernova remnants are short-lived, studies of neutron star X-ray binaries within supernova remnants probe the earliest stages in the life of accreting neutron stars. However, such objects are exceedingly rare: none were known to exist in our Galaxy. We report the discovery of the natal supernova remnant of the accreting neutron star Circinus X-1, which places an upper limit of t < 4600 yr on its age, making it the youngest known X-ray binary and a unique tool to study accretion… 

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