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Confirmation of a High Magnetic Field in GRO J1008-57

Bellm, Eric C. and Fürst, Felix and Pottschmidt, Katja and Tomsick, John A. and Boggs, Steven E. and Chakrabarty, Deepto and Christensen, Finn E. and Craig, William W. and Hailey, Charles J. and Harrison, Fiona A. and Stern, Daniel and Walton, Dominic J. and Wilms, Jörn and Zhang, William W. (2014) Confirmation of a High Magnetic Field in GRO J1008-57. Astrophysical Journal, 792 (2). Art. No. 108. ISSN 0004-637X. doi:10.1088/0004-637X/792/2/108.

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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)_(-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^(12)(1 + z) G, the highest among known accreting pulsars.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bellm, Eric C.0000-0001-8018-5348
Fürst, Felix0000-0003-0388-0560
Pottschmidt, Katja0000-0002-4656-6881
Tomsick, John A.0000-0001-5506-9855
Boggs, Steven E.0000-0001-9567-4224
Chakrabarty, Deepto0000-0001-8804-8946
Christensen, Finn E.0000-0001-5679-1946
Harrison, Fiona A.0000-0003-2992-8024
Stern, Daniel0000-0003-2686-9241
Walton, Dominic J.0000-0001-5819-3552
Wilms, Jörn0000-0003-2065-5410
Zhang, William W.0000-0002-1426-9698
Additional Information:© 2014 American Astronomical Society. Received 2014 March 20; accepted 2014 July 24; published 2014 August 21. This work was supported under NASA contract No. NNG08FD60C and uses data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations team for executing the ToO observation and the Software and Calibration teams for analysis support. This research has used the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). J.W. acknowledges partial support from Deutsches Zentrum für Luftund Raumfahrt grant 50 OR 1113. Facilities: NuSTAR, Swift, Suzaku
Funding AgencyGrant Number
Deutsches Zentrum für Luftund Raumfahrt (DLR)50 OR 1113
Subject Keywords:pulsars: individual (GRO J1008–57); stars: neutron; X-rays: binaries
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2014-36
Issue or Number:2
Record Number:CaltechAUTHORS:20140925-112538542
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Official Citation:Confirmation of a High Magnetic Field in GRO J1008–57 Eric C. Bellm et al. 2014 ApJ 792 108
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50031
Deposited By: Ruth Sustaita
Deposited On:25 Sep 2014 20:16
Last Modified:10 Nov 2021 18:51

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