The multi-outburst activity of the magnetar in Westerlund I

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Title: The multi-outburst activity of the magnetar in Westerlund I
Authors: Borghese, Alice | Rea, Nanda | Turolla, Roberto | Pons, José A. | Esposito, Paolo | Coti Zelati, Francesco | Savchenko, Volodymyr | Bozzo, Enrico | Perna, Rosalba | Zane, Silvia | Mereghetti, Sandro | Campana, Sergio | Mignani, Roberto P. | Bachetti, Matteo | Rodríguez Castillo, Guillermo A. | Pintore, Fabio | Tiengo, Andrea | Götz, Diego | Israel, Gian Luca | Stella, Luigi
Research Group/s: Astrofísica Relativista
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Stars: individual: CXOU J164710.2−455216 | Stars: magnetars | Stars: neutron | X-rays: bursts
Knowledge Area: Astronomía y Astrofísica
Issue Date: 11-Apr-2019
Publisher: Oxford University Press
Citation: Monthly Notices of the Royal Astronomical Society. 2019, 484(3): 2931-2943. doi:10.1093/mnras/stz084
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.
Sponsor: AB, NR, and PE are supported by an NWO Vidi Grant (PI: Rea). NR is also supported by grants AYA2015-71042-P and SGR 2014-1073. PE acknowledges funding in the framework of the project ‘Understanding the X-ray Variable and Transient Sky’ (ULTraS), ASI-INAF contract no. 2017-14-H.0. JAP acknowledges support by the Spanish MINECO/FEDER grant AYA2015-66899-C2-2-P, and the grant of Generalitat Valenciana PROMETEOII-2014-069. FCZ is supported by grants AYA2015-71042-P and SGR 2014-1073. DG acknowledges the financial support of the UnivEarthS Labex program at Sorbonne Paris Citeé (ANR-10-LABX-0023 and ANR-11-IDEX-0005-02). We thank the referee for his comments and the COST Action PHAROS (CA16214) for partial support.
URI: http://hdl.handle.net/10045/89629
ISSN: 0035-8711 (Print) | 1365-2966 (Online)
DOI: 10.1093/mnras/stz084
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Peer Review: si
Publisher version: https://doi.org/10.1093/mnras/stz084
Appears in Collections:INV - Astrofísica Relativista - Artículos de Revistas

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