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NuSTAR detection of a cyclotron line in the supergiant fast X-ray transient IGR J17544−2619
- Bhalerao, Varun;
- Romano, Patrizia;
- Tomsick, John;
- Natalucci, Lorenzo;
- Smith, David M;
- Bellm, Eric;
- Boggs, Steven E;
- Chakrabarty, Deepto;
- Christensen, Finn E;
- Craig, William W;
- Fuerst, Felix;
- Hailey, Charles J;
- Harrison, Fiona A;
- Krivonos, Roman A;
- Lu, Ting-Ni;
- Madsen, Kristin;
- Stern, Daniel;
- Younes, George;
- Zhang, William
- et al.
Published Web Location
https://doi.org/10.1093/mnras/stu2495Abstract
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.
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