Details

Autor(en) / Beteiligte

• Lower, Marcus E.
• Younes, George
• Scholz, Paul
• Camilo, Fernando
• Dunn, Liam
• Johnston, Simon
• Enoto, Teruaki
• Sarkissian, John M.
• Reynolds, John E.
• Palmer, David M.
• Arzoumanian, Zaven
• Baring, Matthew G.
• Gendreau, Keith
• Göğüş, Ersin
• Guillot, Sebastien
• van der Horst, Alexander J.
• Hu, Chin-Ping
• Kouveliotou, Chryssa
• Lin, Lin
• Malacaria, Christian
• Stewart, Rachael
• Wadiasingh, Zorawar

Titel

The 2022 High-energy Outburst and Radio Disappearing Act of the Magnetar 1E 1547.0–5408

Ist Teil von

• The Astrophysical journal, 2023-03, Vol.945 (2), p.153

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2023

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Abstract 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 μ Hz 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.