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An X-ray pulsar with a superstrong magnetic field in the soft γ-ray repeater SGR1806 − 20

Author

Listed:
  • C. Kouveliotou

    (ES-84, Space Science Laboratory, NASA/Marshall Space Flight Center
    Universities Space Research Association)

  • S. Dieters

    (ES-84, Space Science Laboratory, NASA/Marshall Space Flight Center
    University of Alabama in Huntsville)

  • T. Strohmayer

    (Universities Space Research Association
    Laboratory for High Energy Astrophysics, NASA/Goddard Space Flight Center)

  • J. van Paradijs

    (University of Alabama in Huntsville
    Astronomical Institute Anton Pannekoek)

  • G. J. Fishman

    (ES-84, Space Science Laboratory, NASA/Marshall Space Flight Center)

  • C. A. Meegan

    (ES-84, Space Science Laboratory, NASA/Marshall Space Flight Center)

  • K. Hurley

    (Space Sciences Laboratory, University of California)

  • J. Kommers

    (Massachusetts Institute of Technology)

  • I. Smith

    (Rice University, Space Physics and Astronomy)

  • D. Frail

    (NRAO, VLA)

  • T. Murakami

    (ISAS)

Abstract

Soft γ-ray repeaters (SGRs) emit multiple, brief (∼0.1-s), intense outbursts of low-energy γ-rays. They are extremely rare1—three2,3,4 are known in our Galaxy and one5 in the Large Magellanic Cloud. Two SGRs are associated5,6,7 with young supernova remnants (SNRs), and therefore most probably with neutron stars, but it remains a puzzle why SGRs are so different from ‘normal’ radio pulsars. Here we report the discovery of pulsations in the persistent X-ray flux of SGR1806 − 20, with a period of 7.47 s and a spindown rate of 2.6 × 10−3 s yr−1. We argue that the spindown is due to magnetic dipole emission and find that the pulsar age and (dipolar) magnetic field strength are ∼1,500 years and 8× 1014 gauss, respectively. Our observations demonstrate the existence of ‘magnetars’, neutron stars with magnetic fields about 100 times stronger than those of radio pulsars, and support earlier suggestions8,9 that SGR bursts are caused by neutron-star ‘crustquakes’ produced by magnetic stresses. The ‘magnetar’ birth rate is about one per millennium—a substantial fraction of that of radio pulsars. Thus our results may explain why some SNRs have no radio pulsars.

Suggested Citation

  • C. Kouveliotou & S. Dieters & T. Strohmayer & J. van Paradijs & G. J. Fishman & C. A. Meegan & K. Hurley & J. Kommers & I. Smith & D. Frail & T. Murakami, 1998. "An X-ray pulsar with a superstrong magnetic field in the soft γ-ray repeater SGR1806 − 20," Nature, Nature, vol. 393(6682), pages 235-237, May.
    • Handle: RePEc:nat:nature:v:393:y:1998:i:6682:d:10.1038_30410
    DOI: 10.1038/30410
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