Coti Zelati, F;
Borghese, A;
Israel, GL;
Rea, N;
Esposito, P;
Pilia, M;
Burgay, M;
... Keane, EF; + view all
(2021)
The new magnetar SGR J1830-0645 in Outburst.
Astrophysical Journal Letters
, 907
(2)
, Article L34. 10.3847/2041-8213/abda52.
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Abstract
The detection of a short hard X-ray burst and an associated bright soft X-ray source by the Swift satellite in 2020 October heralded a new magnetar in outburst, SGR J1830−0645. Pulsations at a period of ~10.4 s were detected in prompt follow-up X-ray observations. We present here the analysis of the Swift/Burst Alert Telescope burst, of XMM-Newton and the Nuclear Spectroscopic Telescope Array observations performed at the outburst peak, and of a Swift/X-ray Telescope monitoring campaign over the subsequent month. The burst was single-peaked, lasted ~6 ms, and released a fluence of ≈5 × 10−9 erg cm−2 (15–50 keV). The spectrum of the X-ray source at the outburst peak was well described by an absorbed double-blackbody model plus a power-law component detectable up to ~25 keV. The unabsorbed X-ray flux decreased from ~5 × 10−11 to ~2.5 × 10−11 erg cm−2 s−1 one month later (0.3–10 keV). Based on our timing analysis, we estimate a dipolar magnetic field ≈5.5 × 1014 G at pole, a spin-down luminosity ≈2.4 × 1032 erg s−1, and a characteristic age ≈24 kyr. The spin modulation pattern appears highly pulsed in the soft X-ray band, and becomes smoother at higher energies. Several short X-ray bursts were detected during our campaign. No evidence for periodic or single-pulse emission was found at radio frequencies in observations performed with the Sardinia Radio Telescope and Parkes. According to magneto-thermal evolutionary models, the real age of SGR J1830−0645 is close to the characteristic age, and the dipolar magnetic field at birth was slightly larger, ~1015 G.
| Type: | Article |
|---|---|
| Title: | The new magnetar SGR J1830-0645 in Outburst |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/2041-8213/abda52 |
| Publisher version: | http://doi.org/10.3847/2041-8213/abda52 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| 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/10123089 |
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