CONFIRMATION OF A HIGH MAGNETIC FIELD IN GRO J1008–57
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Bellm-2014-CONFIRMATION OF A HI.pdf
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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
Date Issued
August 2014
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
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
Version
Final published version
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[+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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-637x/792/2/108
