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Persistent Emission Properties of SGR J1935+2154 During Its 2020 Active Episode by Gogus, Ersin; Baring, Matthew G.; Kouveliotou, Chryssa; Guver, Tolga; Lin, Lin; Roberts, Oliver J.; Younes, George; Kaneko, Yuki; van der Horst, Alexander J. is a scholarly article available to read on EtoBox.

What is Persistent Emission Properties of SGR J1935+2154 During Its 2020 Active Episode about?

We present detailed spectral and temporal characteristics of the persistent X-ray emission of SGR J1935+2154 based on our XMM-Newton and Chandra observations taken in the aftermath of its April 2020 burst storm, during which hundreds of energetic X-ray bursts were emitted, including one associated with an extraordinary fast radio burst. We clearly detect the pulsed X-ray emission in the XMM-Newton data. An average spin-down rate of 1.6$\times$10$^{-11}$ s s$^{-1}$ is obtained using our spin period measurement combined with three earlier values reported from the same active episode. Our investigations of the XMM-Newton and Chandra spectra with a variety of phenomenological and physically-motivated models, concluded that the magnetic field topology of SGR J1935+2154 is most likely highly non-dipolar. The spectral models indicate that surface field strengths in somewhat localized regions substantially exceed the polar value of 4.4$\times$10$^{14}$ G inferred from a spin-down torque associated with a rotating magnetic dipole.

Author

Gogus, Ersin; Baring, Matthew G.; Kouveliotou, Chryssa; Guver, Tolga; Lin, Lin; Roberts, Oliver J.; Younes, George; Kaneko, Yuki; van der Horst, Alexander J.

Published

2020

Language

EN