Burst properties of the most recurring transient magnetar SGR J1935+2154

Warning The system is temporarily closed to updates for reporting purpose.

Lin, Lin and Göğüş, Ersin and Roberts, Oliver J. and Kouveliotou, Chryssa and Kaneko Göğüş, Yuki and Van der Horst, Alexander J. and Younes, George (2020) Burst properties of the most recurring transient magnetar SGR J1935+2154. Astrophysical Journal, 893 (2). ISSN 0004-637X (Print) 1538-4357 (Online)

Full text not available from this repository. (Request a copy)

Abstract

We present timing and time-integrated spectral analysis of 127 bursts from SGR J1935+2154. These bursts were observed with the Gamma-ray Burst Monitor on the Fermi Gamma-ray Space Telescope and the Burst Alert Telescope on the Neil Gehrels Swift Observatory during the source's four active episodes from 2014 to 2016. This activation frequency makes SGR J1935+2154 the most burst prolific transient magnetar. We find the average duration of all the detected bursts to be much shorter than the typical, anticipated value. We fit the burst time-integrated spectra with two blackbody functions, a Comptonized model and three other simpler models. Bursts from SGR J1935+2154 exhibit similar spectral properties to other magnetars, with the exception of the power-law index from the Comptonized model, which correlates with burst fluence. We find that the durations and both blackbody temperatures of the bursts have significantly evolved across the four active episodes. We also find that the burst time history exhibits two trends, which are strongly correlated with the decay of the persistent emission in each outburst.
Item Type: Article
Uncontrolled Keywords: Magnetars; Soft gamma-ray repeaters; Neutron stars; Transient sources; Gamma-ray transient sources; X-ray transient sources
Subjects: Q Science > QB Astronomy > QB460-466 Astrophysics
Divisions: Foundations Development
Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences
Depositing User: Ersin Göğüş
Date Deposited: 20 Sep 2020 18:16
Last Modified: 20 Sep 2020 18:19
URI: https://research.sabanciuniv.edu/id/eprint/40471

Actions (login required)

View Item
View Item