Confirmation of a high magnetic field in GRO J1008-57

Eric C. Bellm, Felix Fuerst, Katja Pottschmidt, John A. Tomsick, Steven E. Boggs, Deepto Chakrabarty, Finn Erland Christensen, William W. Craig, Charles J. Hailey, Fiona A. Harrison, Daniel Stern, Dominic J. Walton, Joern Wilms, William W. Zhang

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Abstract

GRO J1008-57 is a high-mass X-ray binary for which several claims of a cyclotron resonance scattering feature near 80 keV have been reported. We use NuSTAR, Suzaku, and Swift data from its giant outburst of 2012 November to confirm the existence of the 80 keV feature and perform the most sensitive search to date for cyclotron scattering features at lower energies. We find evidence for a 78(-2)(+3) keV line in the NuSTAR and Suzaku data at >4 sigma significance, confirming the detection using Suzaku alone by Yamamoto et al. A search of both the phase-averaged and phase-resolved data rules out a fundamental at lower energies with optical depth larger than 5% of the 78 keV line. These results indicate that GRO J1008-57 has a magnetic field of 6.7 x 10(12)(1 + z) G, the highest among known accreting pulsars.
Original languageEnglish
Article number108
JournalAstrophysical Journal
Volume792
Issue number2
Number of pages7
ISSN0004-637X
DOIs
Publication statusPublished - 2014

Keywords

  • ASTRONOMY
  • SPECTROSCOPIC-TELESCOPE-ARRAY
  • X-RAY PULSARS
  • CYCLOTRON LINE
  • LMC X-4
  • ENERGY
  • ABSORPTION
  • DISCOVERY
  • SPECTRUM
  • MISSION
  • BINARY
  • pulsars: individual (GRO J1008-57)
  • stars: neutron
  • X-rays: binaries

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