An X-Ray and Radio View of the 2022 Reactivation of the Magnetar SGR J1935+2154
Journal article, 2024
Recently, the Galactic magnetar SGR J1935+2154 has garnered attention due to its emission of an extremely luminous radio burst, reminiscent of fast radio bursts (FRBs). SGR J1935+2154 is one of the most active magnetars, displaying flaring events nearly every year, including outbursts as well as short and intermediate bursts. Here, we present our results on the properties of the persistent and bursting X-ray emission from SGR J1935+2154 during the initial weeks following its outburst on 2022 October 10. The source was observed with XMM-Newton and NuSTAR (quasi-)simultaneously during two epochs, separated by ∼5 days. The persistent emission spectrum is well described by an absorbed blackbody plus power-law model up to an energy of ∼25 keV. No significant changes were observed in the blackbody temperature (kT BB ∼ 0.4 keV) and emitting radius (R BB ∼ 1.9 km) between the two epochs. However, we observed a slight variation in the power-law parameters. Moreover, we detected X-ray pulsations in all the data sets and derived a spin-period derivative of P ̇ = 5.52 ( 5 ) × 10 − 11 s s−1. This is 3.8 times larger than the value measured after the first recorded outburst in 2014. Additionally, we performed quasi-simultaneous radio observations using three 25-32 m class radio telescopes for a total of 92.5 hr to search for FRB-like radio bursts and pulsed emission. However, our analysis did not reveal any radio bursts or periodic emission.
Author
A. Y. Ibrahim
Institute of Space Sciences (ICE) - CSIC
Institute of Space Studies of Catalonia (IEEC)
A. Borghese
University of La Laguna
Instituto de Astrofísica de Canarias
Francesco Coti Zelati
Institute of Space Studies of Catalonia (IEEC)
Institute of Space Sciences (ICE) - CSIC
E. Parent
Institute of Space Sciences (ICE) - CSIC
Institute of Space Studies of Catalonia (IEEC)
A. Marino
Institute of Space Studies of Catalonia (IEEC)
Institute of Space Sciences (ICE) - CSIC
O. S. Ould-Boukattine
Netherlands Institute for Radio Astronomy (ASTRON)
Anton Pannekoek Institute for Astronomy
N. Rea
Institute of Space Sciences (ICE) - CSIC
Institute of Space Studies of Catalonia (IEEC)
S. Ascenzi
Gran Sasso Science Institute (GSSI)
Laboratori Nazionali del Gran Sasso
Istituto nazionale di astrofisica (INAF)
D. P. Pacholski
University of Milano-Bicocca
Istituto nazionale di astrofisica (INAF)
S. Mereghetti
Istituto nazionale di astrofisica (INAF)
G. L. Israel
Osservatorio Astronomico di Roma
A. Tiengo
Istituto nazionale di astrofisica (INAF)
Scuola Universitaria Superiore IUSS di Pavia
A. Possenti
Istituto nazionale di astrofisica (INAF)
M. Burgay
Istituto nazionale di astrofisica (INAF)
R. Turolla
University College London (UCL)
University of Padua
S. Zane
University College London (UCL)
P. Esposito
Scuola Universitaria Superiore IUSS di Pavia
Istituto nazionale di astrofisica (INAF)
D. Götz
University Paris-Saclay
S. Campana
Istituto nazionale di astrofisica (INAF)
Franz Kirsten
Chalmers, Space, Earth and Environment, Onsala Space Observatory
M. P. Gawroński
Nicolaus Copernicus University
J. W. T. Hessels
Anton Pannekoek Institute for Astronomy
Netherlands Institute for Radio Astronomy (ASTRON)
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 965 1 87Subject Categories
Astronomy, Astrophysics and Cosmology
Fusion, Plasma and Space Physics
DOI
10.3847/1538-4357/ad293b