An X-Ray and Radio View of the 2022 Reactivation of the Magnetar SGR J1935+2154

• DOI: 10.3847/1538-4357/ad293b
• Publication Date: 2024-04-09T18:17:42Z
• Authors: A. Y. Ibrahim; A. Borghese; F. Coti Zelati; E. Parent; A. Marino; O. S. Ould-Boukat...; N. Rea; S. Ascenzi; D. P. Pacholski; S. Mereghetti; G. L. Israel; A. Tiengo; A. Possenti; M. Burgay; R. Turolla; S. Zane; P. Esposito; D. Götz; S. Campana; F. Kirsten; M. P. Gawroński; J. W. T. Hessels
• Keywords: Magnetar

Abstract Recently, the Galactic magnetar SGR J1935+2154 has garnered attention due to its emission of an extremely luminous radio burst, reminiscent fast bursts (FRBs). is one most active magnetars, displaying flaring events nearly every year, including outbursts as well short and intermediate bursts. Here, we present our results on properties persistent bursting X-ray from during initial weeks following outburst 2022 October 10. The source was observed with XMM-Newton NuSTAR (quasi-)simultaneously two epochs, separated by ∼5 days. spectrum described absorbed blackbody plus power-law model up energy ∼25 keV. No significant changes were in temperature ( kT BB ∼ 0.4 keV) emitting radius R 1.9 km) between epochs. However, a slight variation parameters. Moreover, detected pulsations all data sets derived spin-period derivative <?CDATA $\dot{P}=5.52(5)\times {10}^{-11}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>P</mml:mi> </mml:mrow> <mml:mo>̇</mml:mo> </mml:mover> <mml:mo>=</mml:mo> <mml:mn>5.52</mml:mn> <mml:mo stretchy="false">(</mml:mo> <mml:mn>5</mml:mn> stretchy="false">)</mml:mo> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mo>−</mml:mo> <mml:mn>11</mml:mn> </mml:msup> </mml:math> s −1 . This 3.8 times larger than value measured after first recorded 2014. Additionally, performed quasi-simultaneous observations using three 25–32 m class telescopes for total 92.5 hr search FRB-like pulsed emission. analysis did not reveal any or periodic