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

Bhalerao, Varun and Romano, Patrizia and Tomsick, John and Natalucci, Lorenzo and Smith, David M. and Bellm, Eric and Boggs, Steven E. and Chakrabarty, Deepto and Christensen, Finn E. and Craig, William W. and Fuerst, Felix and Hailey, Charles J. and Harrison, Fiona A. and Krivonos, Roman A. and Lu, Ting-Ni and Madsen, Kristin and Stern, Daniel and Younes, George and Zhang, William (2015) NuSTAR detection of a cyclotron line in the supergiant fast X-ray transient IGR J17544−2619. Monthly Notices of the Royal Astronomical Society, 447 (3). pp. 2274-2281. ISSN 0035-8711. doi:10.1093/mnras/stu2495.

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We present NuSTAR spectral and timing studies of the Supergiant Fast X-ray Transient (SFXT) IGR J17544-2619. The spectrum is well-described by a ~ 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 a SFXT. The inferred magnetic field strength, B = (1.45 ± 0.03) x 10^(12)G • (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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bhalerao, Varun0000-0002-6112-7609
Tomsick, John0000-0001-5506-9855
Natalucci, Lorenzo0000-0002-6601-9543
Smith, David M.0000-0002-0542-5759
Bellm, Eric0000-0001-8018-5348
Boggs, Steven E.0000-0001-9567-4224
Chakrabarty, Deepto0000-0001-8804-8946
Christensen, Finn E.0000-0001-5679-1946
Fuerst, Felix0000-0003-0388-0560
Harrison, Fiona A.0000-0003-2992-8024
Krivonos, Roman A.0000-0003-2737-5673
Madsen, Kristin0000-0003-1252-4891
Stern, Daniel0000-0003-2686-9241
Younes, George0000-0002-7991-028X
Zhang, William0000-0002-1426-9698
Additional Information:© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 November 22. Received 2014 September 12. In original form 2014 June 30. First published online January 7, 2015. This work was supported in part under NASA Contract No. NNG08FD60C, and made use of 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, Software and Calibration teams as well as the Swift team for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). PR acknowledges contract ASI-INAF I/004/11/0. LN wishes to acknowledge the Italian Space Agency (ASI) for Financial support by ASI/INAF grant I/037/12/0-011/13. VB thanks Dipankar Bhattacharya for helpful discussions. Facilities: NuSTAR, Swift
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)I/004/11/0
Agenzia Spaziale Italiana (ASI)I/037/12/0-011/13
Subject Keywords:binaries: individual (IGR J17544-2619) – X-rays: binaries
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2015-71
Issue or Number:3
Record Number:CaltechAUTHORS:20141211-083525123
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52574
Deposited By: Ruth Sustaita
Deposited On:11 Dec 2014 17:07
Last Modified:10 Nov 2021 19:42

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