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arXiv 2009.10342astro-ph.HE
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爆发前爆发:SGR J1935 +2154的PDKEEPAAA 200428相关和FRB缺失X射线爆发的比较研究

Bursts before Burst: A Comparative Study on FRB 200428-associated and FRB-absent X-ray Bursts from SGR J1935+2154

Yu-Han Yang, Bin-Bin Zhang, Lin Lin, Bing Zhang, Guo-Qiang Zhang, Yi-Si Yang, Zuo-Lin Tu, Jin-Hang Zou, Hao-Yang Ye, Fa-Yin Wang, Zi-Gao Dai

摘要:

伴随着一个X射线爆发,快速射电暴(FRB)FRB 200428最近被证实是来自银河系磁星软伽马中继器(SGR)SGR J1935+2154。就在FRB 200428被探测到之前和之后,500米口径球面射电望远镜(FAST)已经对SGR J1935+2154进行了8个小时的监测。从UTC 2020年4月27日23:55:00到2020年4月28日00:50:37,FAST没有探测到SGR J1935+2154的脉冲射电发射,而费米/伽马射线暴监测器在X/软$γ$ -射线波段记录了34个爆发,形成了一个独特的X射线爆发样本。在综合分析了这些FRB缺失的X射线爆发的光变曲线、时间积分和时间分辨光谱特性之后,我们将该样品与Insight-HXMT、INTEGRAL和Konus-Wind探测到的FRB相关的X射线爆发进行了比较。与FRB相关的爆发与其他X射线爆发的区别在于它的非热谱和更高的谱峰能量,但在其他方面并不典型。我们还比较了我们的X射线爆发样品的累积能量分布与第一个重复的FRB源,FRB 121102,与FRB 200428-X射线爆发协会的校准。我们发现两者之间的相似之处,提供间接支持的磁星起源的宇宙学FRB。磁星爆发的事件率密度大约是FRB 200428能量下FRB事件率密度的$\sim 150$倍。这再次表明,如果所有的FRB都起源于磁星,那么只有一小部分X射线爆发与FRB有关。

英文摘要:

Accompanied by an X-ray burst, the fast radio burst (FRB) FRB 200428 was recently confirmed as originating from the Galactic magnetar soft gamma repeater (SGR) SGR J1935+2154. Just before and after FRB 200428 was detected, the Five-hundred-meter Aperture Spherical radio Telescope (FAST) had been monitoring SGR J1935+2154 for eight hours. From UTC 2020 April 27 23:55:00 to 2020 April 28 00:50:37, FAST detected no pulsed radio emission from SGR J1935+2154, while Fermi/Gamma-ray Burst Monitor registered 34 bursts in the X/soft $γ$-ray band, forming a unique sample of X-ray bursts in the absence of FRBs. After a comprehensive analysis on light curves, time-integrated, and time-resolved spectral properties of these FRB-absent X-ray bursts, we compare this sample with the FRB-associated X-ray burst detected by Insight-HXMT, INTEGRAL, and Konus-Wind. The FRB-associated burst distinguishes itself from other X-ray bursts by its nonthermal spectrum and a higher spectral peak energy, but otherwise is not atypical. We also compare the cumulative energy distribution of our X-ray burst sample with that of first repeating FRB source, FRB 121102, with the calibration of FRB 200428-X-ray burst association. We find a similarity between the two, offering indirect support of the magnetar origin of cosmological FRBs. The event rate density of magnetar bursts is about $\sim 150$ times higher than the FRB event rate density at the energy of FRB 200428. This again suggests that, if all FRBs originate from magnetars, only a small fraction of X-ray bursts are associated with FRBs.

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