arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.13246astro-ph.HE
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对与伽马射线暴有关的重复快速射电暴的目标搜索

A targeted search for repeating fast radio bursts associated with gamma-ray bursts

Nipuni T. Palliyaguru, Devansh Agarwal, Golnoosh Golpayegani, Ryan Lynch, Duncan R. Lorimer, Benjamin Nguyen, Alessandra Corsi, Sarah Burke-Spolaor

摘要:

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。大型单碟望远镜如阿雷西博天文台(AO)和绿岸望远镜(GBT)具有探测千兆秒差距距离FRB~121102类爆发的灵敏度。在这里,我们提出了使用AO和GBT的搜索,旨在寻找潜在的无线电爆发在11个地点的过去$γ$-射线爆发,显示证据的诞生磁星。我们还对GW170817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$10\,σ$通量上限设置为1.4 GHz时的$\approx 0.036$ Jy ms和4.5 GHz时的$\approx 0.063$ Jy ms,对于GBT数据,我们将通量上限设置为1.4 GHz时的$\approx 0.085$ Jy ms和1.9 GHz时的$\approx 0.098$ Jy ms,对于$\approx 42$ ms的最大脉冲宽度,AO观测具有足够的灵敏度来探测任何与最近从银河系探测到的亮度相似的FRB磁星SGR 1935 + 2154。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($α\lesssim-1.0$)和大的截止光度($L_0 \gtrsim 10^{42}$ erg/s)。

英文摘要:

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 $γ$--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 $10\,σ$ 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 ($α\lesssim-1.0$) and a large cut--off luminosity ($L_0 \gtrsim 10^{42}$ erg/s).

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