Deep X-ray and radio observations of the first outburst of the young magnetar Swift J1818.0-1607

A. Y. Ibrahim, A. Borghese, N. Rea, F. Coti Zelati, E. Parent, T. D. Russell, S. Ascenzi, R. Sathyaprakash, D. Gotz, S. Mereghetti, M. Topinka, M. Rigoselli, V. Savchenko, S. Campana, Gian Luca Israel, A. Tiengo, R. Perna, R. Turolla, S. Zane, P. EspositoG. A. Rodrıguez Castillo, V. Graber, A. Possenti, C. Dehman, M. Ronchi, S. Loru

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Abstract

Swift J1818.0-1607 is a radio-loud magnetar with a spin period of 1.36 s and a dipolar magnetic field strength of B~3E14 G, which is very young compared to the Galactic pulsar population. We report here on the long-term X-ray monitoring campaign of this young magnetar using XMM-Newton, NuSTAR, and Swift from the activation of its first outburst in March 2020 until October 2021, as well as INTEGRAL upper limits on its hard X-ray emission. The 1-10 keV magnetar spectrum is well modeled by an absorbed blackbody with a temperature of kT_BB~1.1 keV, and apparent reduction in the radius of the emitting region from ~0.6 to ~0.2 km. We also confirm the bright diffuse X-ray emission around the source extending between ~50'' and ~110''. A timing analysis revealed large torque variability, with an average spin-down rate nudot~-2.3E-11 Hz^2 that appears to decrease in magnitude over time. We also observed Swift J1818.0-1607 with the Karl G. Jansky Very Large Array (VLA) on 2021 March 22. We detected the radio counterpart to Swift J1818.0-1607 measuring a flux density of S_v = 4.38+/-0.05 mJy at 3 GHz, and a half ring-like structure of bright diffuse radio emission located at ~90'' to the west of the magnetar. We tentatively suggest that the diffuse X-ray emission is due to a dust scattering halo and that the radio structure may be associated with the supernova remnant of this young pulsar, based on its morphology.
Original languageEnglish
Article number20
JournalThe Astrophysical Journal
Volume943
Issue number1
DOIs
Publication statusPublished - 20 Jan 2023

Keywords

  • astro-ph.HE

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