Broadband X-ray burst spectroscopy of the fast-radio-burst-emitting Galactic magnetar

Younes, G. and Baring, M. G. and Kouveliotou, C. and Arzoumanian, Z. and Enoto, T. and Doty, J. and Gendreau, K. C. and Göğüş, Ersin and Guillot, S. and Güver, T. and Harding, A. K. and Ho, W. C.G. and van der Horst, A. J. and Hu, C. P. and Jaisawal, G. K. and Kaneko, Yuki and LaMarr, B. J. and Lin, L. and Majid, W. and Okajima, T. and Pope, J. and Ray, P. S. and Roberts, O. J. and Saylor, M. and Steiner, J. F. and Wadiasingh, Z. (2021) Broadband X-ray burst spectroscopy of the fast-radio-burst-emitting Galactic magnetar. Nature Astronomy, 5 (4). pp. 408-413. ISSN 2397-3366

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Magnetars are young, magnetically powered neutron stars that possess the strongest magnetic fields in the Universe. Fast radio bursts (FRBs) are extremely intense millisecond-long radio pulses of primarily extragalactic origin, and a leading attribution for their genesis focuses on magnetars. A hallmark signature of magnetars is their emission of bright, hard X-ray bursts of sub-second duration. On 27 April 2020, the Galactic magnetar SGR J1935+2154 emitted hundreds of X-ray bursts within a few hours. One of these temporally coincided with an FRB, the first known detection of an FRB from the Milky Way. Here, we present spectral and temporal analyses of 24 X-ray bursts emitted 13 hours prior to the FRB and seen simultaneously with the Neutron Star Interior Composition Explorer (NICER) mission of the National Aeronautics and Space Administration and with the Fermi Gamma-ray Burst Monitor (GBM) mission in their combined energy range of 0.2 keV to 30 MeV. These broadband spectra permit direct comparison with the spectrum of the FRB-associated X-ray burst (FRB-X). We demonstrate that all 24 NICER and GBM bursts are very similar temporally to the FRB-X, but strikingly different spectrally. The singularity of the FRB-X burst is perhaps indicative of an uncommon locale for its origin. We suggest that this event originated in quasi-polar open or closed magnetic field lines that extend to high altitudes.
Item Type: Article
Divisions: Foundations Development
Depositing User: Yuki Kaneko
Date Deposited: 03 Sep 2022 13:35
Last Modified: 03 Sep 2022 13:35

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