The 2022 high-energy outburst and radio disappearing act of the magnetar 1E 1547.0-5408

Lower, Marcus E. and Younes, George and Scholz, Paul and Camilo, Fernando and Dunn, Liam and Johnston, Simon and Enoto, Teruaki and Sarkissian, John M. and Reynolds, John E. and Palmer, David M. and Arzoumanian, Zaven and Baring, Matthew G. and Gendreau, Keith and Göğüş, Ersin and Guillot, Sebastien and van der Horst, Alexander J. and Hu, Chin Ping and Kouveliotou, Chryssa and Lin, Lin and Malacaria, Christian and Stewart, Rachael and Wadiasingh, Zorawar (2023) The 2022 high-energy outburst and radio disappearing act of the magnetar 1E 1547.0-5408. Astrophysical Journal, 945 (2). ISSN 0004-637X (Print) 1538-4357 (Online)

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We report the radio and high-energy properties of a new outburst from the radio-loud magnetar 1E 1547.0−5408. Following the detection of a short burst from the source with Swift-BAT on 2022 April 7, observations by NICER detected an increased flux peaking at (6.0 ± 0.4) × 10−11 erg s−1 cm−2 in the soft X-ray band, falling to a baseline level of 1.7 × 10−11 erg s−1 cm−2 over a 17 day period. Joint spectroscopic measurements by NICER and NuSTAR indicated no change in the hard nonthermal tail despite the prominent increase in soft X-rays. Observations at radio wavelengths with Murriyang, the 64 m Parkes radio telescope, revealed that the persistent radio emission from the magnetar disappeared at least 22 days prior to the initial Swift-BAT detection and was redetected two weeks later. Such behavior is unprecedented in a radio-loud magnetar, and may point to an unnoticed slow rise in the high-energy activity prior to the detected short bursts. Finally, our combined radio and X-ray timing revealed the outburst coincided with a spin-up glitch, where the spin frequency and spin-down rate increased by 0.2 ± 0.1 μHz and (−2.4 ± 0.1) × 10−12 s−2, respectively. A linear increase in the spin-down rate of (−2.0 ± 0.1) × 10−19 s−3 was also observed over 147 days of postoutburst timing. Our results suggest that the outburst may have been associated with a reconfiguration of the quasi-polar field lines, likely signaling a changing twist, accompanied by spatially broader heating of the surface and a brief quenching of the radio signal, yet without any measurable impact on the hard X-ray properties.
Item Type: Article
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ersin Göğüş
Date Deposited: 05 Aug 2023 11:22
Last Modified: 05 Aug 2023 11:22

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