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NuSTAR detection of a cyclotron line in the supergiant fast X-ray transient IGR J17544-2619

  • Author(s): Bhalerao, V
  • Romano, P
  • Tomsick, J
  • Natalucci, L
  • Smith, DM
  • Bellm, E
  • Boggs, SE
  • Chakrabarty, D
  • Christensen, FE
  • Craig, WW
  • Fuerst, F
  • Hailey, CJ
  • Harrison, FA
  • Krivonos, RA
  • Lu, TN
  • Madsen, K
  • Stern, D
  • Younes, G
  • Zhang, W
  • et al.
Abstract

© 2015 The Authors. We present NuSTAR spectral and timing studies of the supergiant fast X-ray transient (SFXT) IGR J17544-2619. The spectrum is well described by an ~1 keV blackbody and a hard continuum component, as expected from an accreting X-ray pulsar. We detect a cyclotron line at 17 keV, confirming that the compact object in IGR J17544-2619 is indeed a neutron star. This is the first measurement of the magnetic field in an SFXT. The inferred magnetic field strength, B = (1.45 ± 0.03) × 1012G (1 + z) is typical of neutron stars in X-ray binaries, and rules out a magnetar nature for the compact object. We do not find any significant pulsations in the source on time-scales of 1-2000 s.

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