论文标题
XTE J1739-285的X射线爆发：一个更好的样本
The X-ray bursts of XTE J1739-285: a NICER sample
论文作者
论文摘要
在这项工作中，我们报告了已知中子星X射线瞬态XTE J1739-285的中子星内部成分探索者的观测。我们在2020年的2月和3月观察了该消息来源，发现它处于高度积极的爆发状态。在20天的时间内，我们检测到32个热核X射线突发，平均爆发复发时间为$ 2.0^{+0.4} _ { - 0.3} $ HR。 X射线爆发集合的时序和光谱分析揭示了均匀的爆发特性，短期时间爆发的证据以及检测386.5 Hz爆发振荡候选者的检测。鉴于先前对该来源的研究声称有1122 Hz爆发振荡候选者，后者尤其值得注意。我们没有发现在1122 Hz附近可变性的任何证据，而是发现386.5 Hz振荡是两个爆发振荡候选者中更突出的信号。因此，我们得出结论，XTE J1739-285不太可能具有亚毫秒旋转期。
In this work we report on observations with the Neutron Star Interior Composition Explorer of the known neutron star X-ray transient XTE J1739-285. We observed the source in 2020 February and March, finding it in a highly active bursting state. Across a 20-day period, we detected 32 thermonuclear X-ray bursts, with an average burst recurrence time of $2.0^{+0.4}_{-0.3}$ hr. A timing and spectral analysis of the ensemble of X-ray bursts reveals homogeneous burst properties, evidence for short-recurrence time bursts, and the detection of a 386.5 Hz burst oscillation candidate. The latter is especially notable, given that a previous study of this source claimed a 1122 Hz burst oscillation candidate. We did not find any evidence of variability near 1122 Hz, and instead find that the 386.5 Hz oscillation is the more prominent signal of the two burst oscillation candidates. Hence, we conclude it is unlikely that XTE J1739-285 has a sub-millisecond rotation period.
