Borghese, A;
Rea, N;
Turolla, R;
Pons, J;
Esposito, P;
Coti Zelati, F;
Savchenko, V;
... Stella, L; + view all
(2019)
The multi-outburst activity of the magnetar in Westerlund I.
Monthly Notices of the Royal Astronomical Society
, 484
(3)
pp. 2931-2943.
10.1093/mnras/stz084.
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Abstract
After two major outbursts in 2006 and 2011, on 2017 May 16 the magnetar CXOU J164710.2−455216, hosted within the massive star cluster Westerlund I, emitted a short (∼20 ms) burst, which marked the onset of a new active phase. We started a long-term monitoring campaign with Swift (45 observations), Chandra (five observations), and NuSTAR (four observations) from the activation until 2018 April. During the campaign, Swift Burst Alert Telescope (BAT) registered the occurrence of multiple bursts, accompanied by two other enhancements of the X-ray persistent flux. The long time span covered by our observations allowed us to study the spectral and the timing evolution of the source. After ∼11 months since the 2017 May outburst onset, the observed flux was ∼15 times higher than its historical minimum level and a factor of ∼3 higher than the level reached after the 2006 outburst. This suggests that the crust has not fully relaxed to the quiescent level, or that the source quiescent level has changed following the multiple outburst activities in the past 10 yr or so. This is another case of multiple outbursts from the same source on a yearly time-scale, a somehow recently discovered behaviour in magnetars.
| Type: | Article |
|---|---|
| Title: | The multi-outburst activity of the magnetar in Westerlund I |
| Location: | UK |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stz084 |
| Publisher version: | https://doi.org/10.1093/mnras/stz084 |
| 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. |
| Keywords: | stars: individual: CXOU J164710.2−455216, stars: magnetars, stars: neutron, X-rays: bursts |
| 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/10065572 |
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