Hsien-chieh Shen, Takanori Sakamoto, Motoko Serino, Yuri Sato
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引用次数: 0
摘要
最近发现了一种新型宇宙学瞬变现象,被称为快速射电暴(FRBs)。FRB的来源仍然未知。FRB的一种可能情况是旋转的超大质量中子星的坍缩。Zhang(2014,ApJ,780,L21)认为,坍缩可能发生在超大质量中子星诞生后不久(几百到几千秒)。长伽玛射线暴和短伽玛射线暴(GRBs)的X射线余辉中都可以看到这种迹象。例如,X射线余辉通量从浅衰变(衰变指数小于$-1)突然下降(衰变指数从$-3陡降至$-9),就表明发生了这样的事件。我们从 Swift/XRT GRB 星表中选取了在浅衰变阶段之后出现陡峭衰变的 X 射线余辉光变曲线。通过对这些光曲线进行双幂律函数拟合,我们分析了衰变指数突然发生变化的时间,并将其与FRB的发生时间进行了比较。我们发现,我们的GRB样本中没有一个与FRB的发生时间相吻合。
Searching for the signature of fast radio burst by Swift/XRT X-ray afterglow light curve
A new type of cosmological transient, dubbed fast radio bursts (FRBs), was recently discovered. The source of FRBs is still unknown. One possible scenario of an FRB is the collapse of a spinning supra-massive neutron star. Zhang (2014, ApJ, 780, L21) suggests that the collapse can happen shortly (hundreds to thousands of seconds) after the birth of supra-massive neutron stars. The signatures can be visible in X-ray afterglows of long and short gamma-ray bursts (GRBs). For instance, a sudden drop (decay index steeper than $-3$ to $-9$) from a shallow decay (decay index shallower than $-1$) in the X-ray afterglow flux can indicate such an event. We selected the X-ray afterglow light curves with a steep decay after the shallow decay phase from the Swift/XRT GRB catalog. We analyzed when the decay index changed suddenly by fitting these light curves to double power-law functions and compared them with the onset of FRBs. We found that none of our GRB samples match the onset of FRBs.
期刊介绍:
Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.