A targeted search for repeating fast radio bursts associated with gamma-ray bursts
A targeted search for repeating fast radio bursts associated with gamma-ray bursts
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DOI：
10.1093/mnras/staa3352
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发表时间：
2020-07
影响因子：
4.8
通讯作者：
N. Palliyaguru;D. Agarwal;Golnoosh Golpayegani;R. Lynch;D. Lorimer;Benjamin M. X. Nguyen;A. Corsi;S. Burke-Spolaor
中科院分区：
文献类型：
--
作者：
N. Palliyaguru;D. Agarwal;Golnoosh Golpayegani;R. Lynch;D. Lorimer;Benjamin M. X. Nguyen;A. Corsi;S. Burke-Spolaor
快速射电暴（FRB）的起源仍然是一个谜，即使在过去三年中发现的数量有所增加。越来越多的证据表明，一些FRB可能起源于磁星。大型单碟望远镜如Arecibo天文台（AO）和绿色班克望远镜（GBT）具有探测千兆秒差距距离FRB~121102类爆发的灵敏度。在这里，我们提出的搜索使用AO和GBT，旨在寻找潜在的无线电爆发在11个网站的过去$\gamma$-射线爆发，显示证据的诞生磁星。我们还对GW 170817进行了搜索，其合并残留物的性质仍然不确定。对于AO数据，我们将1.4 GHz时的$\sigma $通量上限设置为$\approximately 0.036$ Jy ms，4.5 GHz时的$\approximately 0.063$ Jy ms，对于GBT数据，我们将1.4 GHz时的$\approximately 0.085$ Jy ms，1.9 GHz时的$\approximately 0.098$ Jy ms设置为通量上限，AO观测具有足够的灵敏度来探测任何与最近从银河系磁星SGR 1935+2154探测到的光度相似的FRB。假设FRB的光度函数为Schechter函数，我们发现我们的未检测倾向于陡峭的幂律指数（$\alpha\lesssim-1.0$）和大的截止光度（$L_0 \gtrsim 10^{42}$ erg/s）。
The origin of fast radio bursts (FRBs) still remains a mystery, even with the increased number of discoveries in the last three years. Growing evidence suggests that some FRBs may originate from magnetars. Large, single-dish telescopes such as Arecibo Observatory (AO) and Green Bank Telescope (GBT) have the sensitivity to detect FRB~121102-like bursts at gigaparsec distances. Here we present searches using AO and GBT that aimed to find potential radio bursts at 11 sites of past $\gamma$--ray bursts that show evidence for the birth of a magnetar. We also performed a search towards GW170817, which has a merger remnant whose nature remains uncertain. We place $10\,\sigma$ fluence upper limits of $\approx 0.036$ Jy ms at 1.4 GHz and $\approx 0.063$ Jy ms at 4.5 GHz for AO data and fluence upper limits of $\approx 0.085$ Jy ms at 1.4 GHz and $\approx 0.098$ Jy ms at 1.9 GHz for GBT data, for a maximum pulse width of $\approx 42$ ms. The AO observations had sufficient sensitivity to detect any FRB of similar luminosity to the one recently detected from the Galactic magnetar SGR 1935+2154. Assuming a Schechter function for the luminosity function of FRBs, we find that our non-detections favor a steep power--law index ($\alpha\lesssim-1.0$) and a large cut--off luminosity ($L_0 \gtrsim 10^{42}$ erg/s).