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arXiv 2305.09428astro-ph.HE
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搜寻快速射电暴的伽马射线辐射

Hunting for gamma-ray emission from Fast Radio Bursts

G. Principe, L. Di Venere, M. Negro, N. Di Lalla, N. Omodei, R. Di Tria, M. N. Mazziotta, F. Longo

AI总结:

本研究利用Fermi-LAT数据对1000多个FRB事件进行了迄今最大规模的伽马射线辐射搜寻,未发现显著辐射,但给出了短长时间尺度及累积辐射的最严格能量上限,为限制FRB起源和辐射机制提供了重要约束。

摘要:

快速射电暴(FRBs)是近期发现的GHz频段、毫秒持续时间、Jy级流量的天体物理瞬变源,其起源仍是个谜。探索其伽马射线对应体对于限制其起源和辐射机制至关重要。得益于Fermi大面积望远镜收集的超过13年的伽马射线数据,以及超过1000个FRB事件(迄今为止创建的最大样本之一),我们进行了迄今为止对FRB源伽马射线辐射最大、最深入的搜寻。除了在不同时间尺度(从几秒到数年)上研究单个FRB事件外,我们还首次对FRB事件全样本进行了叠加分析,并搜寻与射电事件重合的三重光子。我们未探测到显著辐射,在短时间尺度上报告了对SGR 1935+2154类FRB辐射的最严格限制,其$E<10^{41}$ erg,相当于相对于射电辐射能量的倍数$<10^7$。对于所有重复暴稳态辐射的叠加信号,获得的FRBs光度上限(UL)为($L<1.6\times10^{43}$ erg s$^{-1}$),比从单个源推导的值低两个数量级以上。最后,没有单个或三重光子被显著关联到FRB事件。我们推导出LAT的毫秒能量灵敏度为$E<10^{47}$ (D$_L$/150 Mpc)$^2$ erg,排除了在毫秒时间尺度上伽马射线与射电能量比大于$10^9$的可能性。此处报告的结果代表了迄今为止在短和长时间尺度上对FRBs高能辐射,以及累积辐射和单个光子搜寻的最严格UL。虽然FRBs的起源仍不清楚,但我们的工作为FRB建模提供了重要限制,这可能有助于阐明其辐射机制。

英文摘要:

Fast radio bursts (FRBs) are a recently discovered class of GHz-band, ms-duration, Jy-level-flux astrophysical transients, which origin is still a mystery. Exploring their gamma-ray counterpart is crucial for constraining their origin and emission mechanism. Thanks to more than 13 years of gamma-ray data collected by the Fermi-Large Area Telescope, and to more than 1000 FRB events, one of the largest sample created as of today, we perform the largest and deepest search for gamma-ray emission from FRB sources to date. In addition to the study of individual FRB events on different time-scales (from few seconds up to several years), we performed, for the first time, a stacking analysis on the full sample of FRB events as well as a search for triplet photons in coincidence with the radio event. We do not detect significant emission, reporting the most stringent constraints, on short time scales, for the FRB-like emission from SGR 1935+2154 with $E<10^{41}$ erg, corresponding to a factor $<10^7$ with respect to the emitted radio energy. For the stacked signal of steady emission from all repeaters, the obtained upper limit (UL) on the FRBs luminosity ($L<1.6\times10^{43}$ erg s$^{-1}$) is more than two orders of magnitudes lower than those derived from the individual sources. Finally, no individual or triplet photons have been significantly associated with FRB events. We derived the LAT ms energy sensitivity to be $E<10^{47}$ (D$_L$/150 Mpc)$^2$ erg, ruling out a gamma-ray-to-radio energy ratio greater than $10^9$ on ms timescales. The results reported here represent the most stringent UL reported so far on the high-energy emission from FRBs on short and long time scales, as well as on cumulative emission and individual photon searches. While the origin of FRBs is still unclear, our work provides important constraints for FRB modeling, which might shed light on their emission mechanism.

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