Volume 403, Number 1, May III 2003
|Page(s)||L11 - L14|
|Published online||29 April 2003|
Letter to the Editor
Discovery of a quiescent neutron star binary in the globular cluster M 13
Centre d'Étude Spatiale des Rayonnements, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 04, France
Corresponding author: D. Barret, Didier.Barret@cesr.fr
Accepted: 21 March 2003
We have discovered with XMM-Newton an X-ray source in the core of the globular cluster M 13, whose X-ray spectral properties suggest that it is a quiescent neutron star X-ray binary. The spectrum can be well fitted with a pure hydrogen atmosphere model, with eV, km and an X-ray luminosity of ergs s-1. In the light of this result, we have discovered a strong correlation between the stellar encounter rate and the number of quiescent neutron stars found in the ten globular clusters observed so far by either XMM-Newton or Chandra. This result lends strong support to the idea that these systems are primarily produced by stellar encounters in the core of globular clusters.
Key words: globular clusters / stars: neutron / X-rays: general
© ESO, 2003
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