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High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburstстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 5 марта 2025 г.
- Авторы: Champion David, Cognard Ismael, Cruces Marilyn, Desvignes Gregory, Jankowski Fabian, Karuppusamy Ramesh, Keith Michael J., Kouveliotou Chryssa, Kramer Michael, Liu Kuo, Lyne Andrew G., Mickaliger Mitchell B., O’Connor Brendan, Parthasarathy Aditya, Porayko Nataliya, Rajwade Kaustubh, Stappers Ben W., Torne Pablo, van der Horst Alexander J., Weltevrede Patrick
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 498
- Номер: 4
- Год издания: 2020
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: 6044
- Последняя страница: 6056
- DOI: 10.1093/mnras/staa2764
- Аннотация: We report on multifrequency radio observations of the new magnetar Swift J1818.0-1607, following it for more than one month with high cadence. The observations commenced less than 35 h after its registered first outburst. We obtained timing, polarization, and spectral information. Swift J1818.0-1607 has an unusually steep spectrum for a radio emitting magnetar and also has a relatively narrow and simple pulse profile. The position angle swing of the polarization is flat over the pulse profile, possibly suggesting that our line of sight grazes the edge of the emission beam. This may also explain the steep spectrum. The spin evolution shows large variation in the spin-down rate, associated with four distinct timing events over the course of our observations. Those events may be related to the appearance and disappearance of a second pulse component. The first timing event coincides with our actual observations, while we did not detect significant changes in the emission properties that could reveal further magnetospheric changes. Characteristic ages inferred from the timing measurements over the course of months vary by nearly an order of magnitude. A longer-term spin-down measurement over approximately 100 d suggests a characteristic age of about 500 yr, larger than previously reported. Though Swift J1818.0-1607 could still be one of the youngest neutron stars (and magnetars) detected so far, we caution using the characteristic age as a true-age indicator given the caveats behind its calculation.
- Добавил в систему: Порайко Наталия Константиновна