Ibrahim, AY;
Borghese, A;
Rea, N;
Coti Zelati, F;
Parent, E;
Turolla, R;
Russell, TD;
... et, al.; + view all
(2023)
Deep X-Ray and Radio Observations of the First Outburst of the Young Magnetar Swift J1818.0−1607.
The Astrophysical Journal
, 943
(1)
, Article 20. 10.3847/1538-4357/aca528.
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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 ∼ 3 × 1014 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 2020 March until 2021 October, 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 kTBB ∼ 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 $\dot{\nu }\,\sim $ −2.3 × 10−11 Hz2 that appears to decrease in magnitude over time. We also observed Swift J1818.0−1607 with the Karl G. Jansky Very Large Array on 2021 March 22. We detected the radio counterpart to Swift J1818 measuring a flux density of Sv = 4.38 ± 0.05 mJy at 3 GHz and a half-ringlike 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.
| Type: | Article |
|---|---|
| Title: | Deep X-Ray and Radio Observations of the First Outburst of the Young Magnetar Swift J1818.0−1607 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/aca528 |
| Publisher version: | https://doi.org/10.3847/1538-4357/aca528 |
| Language: | English |
| Additional information: | Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10160171 |
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