CONFIRMATION OF A HIGH MAGNETIC FIELD IN GRO J1008–57
Author(s)Bellm, Eric C.; Pottschmidt, Katja; Tomsick, John A.; Boggs, Steven E.; Chakrabarty, Deepto; Christensen, Finn E.; Craig, William W.; Hailey, Charles J.; Harrison, Fiona A.; Stern, Daniel; Walton, Dominic J.; Zhang, William W.; Chakrabarty, Deepto; Furst, Felix; Wilms, Jorn; ... Show more Show less
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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[+3 over -2] keV line in the NuSTAR and Suzaku data at >4σ 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 × 10[superscript 12](1 + z) G, the highest among known accreting pulsars.
DepartmentMassachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
The Astrophysical Journal
Bellm, Eric C., Felix Furst, Katja Pottschmidt, John A. Tomsick, Steven E. Boggs, Deepto Chakrabarty, Finn E. Christensen, et al. “CONFIRMATION OF A HIGH MAGNETIC FIELD IN GRO J1008–57.” The Astrophysical Journal 792, no. 2 (August 21, 2014): 108. © 2014 The American Astronomical Society
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