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

Journal
Date Issued
2015
Author(s)
Bhalerao, Varun
•
•
Tomsick, John
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•
Smith, David M.
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Bellm, Eric
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Boggs, Steven E.
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Chakrabarty, Deepto
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Christensen, Finn E.
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Craig, William W.
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Fuerst, Felix
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Hailey, Charles J.
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Harrison, Fiona A.
•
Krivonos, Roman A.
•
Lu, Ting-Ni
•
Madsen, Kristin
•
Stern, Daniel
•
Younes, George
•
Zhang, William
DOI
Description
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 .
Abstract
We present NuSTAR spectral and timing studies of the supergiant fast X-ray transient (SFXT) IGR J17544-2619. The spectrum is well described by an ̃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 an SFXT. The inferred magnetic field strength, B = (1.45 ± 0.03) × 1012G (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.
Volume
447
Issue
3
Start page
2274
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.447.2274B
Rights
open.access
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