Parkes observations for project P1171 semester 2023APRS_05

The origin of Fast Radio Bursts (FRBs) is still unclear with a plethora of theoretical models for their origin. Several models predict associated multi-wavelength emission, but previous searches for optical, X-ray or gamma-ray counterparts of FRBs have not led to any detection. The Galactic magnetar SGR 1935+2154A has been observed to simultaneously emit FRB-like bursts and X-ray flares, which suggests that also extragalactic FRB sources may exhibit X-ray counterparts.\n \n Because of the high cost of X-ray satellites and in face of the relatively low FRB detection probability in their small field of view, coordinated radio and X-ray observations are logistically very difficult to set up. We propose a new approach using the X-ray satellite XMM-Newton and the Parkes/Murriyang radio telescope to put constraints on the theoretical models: We aim to conduct shadowing observations with the Parkes telescope to search for new FRBs in fields that are simultaneously covered by XMM-Newton. We hereby target regular XMM observations of nearby (low-z) galaxies, to increase our detection chances of possibly associated X-ray emission. In case of an FRB detection in the radio band, we will have guaranteed simultaneous X-ray coverage and will get detailed information about the associated X-ray spectrum and light curve since all XMM-Newton data will become public a year after the observation.

快速射电暴（Fast Radio Bursts, FRBs）的起源至今尚未明确，学界已提出诸多相关理论模型。部分模型预言其存在多波段伴随辐射，但此前针对快速射电暴的光学、X射线乃至γ射线对应体的搜寻均未获得有效探测结果。此前观测到银河系内的磁星SGR 1935+2154A同时爆发了类快速射电暴脉冲与X射线耀斑，这暗示河外快速射电暴源或许也存在X射线对应体。

由于X射线卫星的部署成本高昂，且其视场范围较小导致快速射电暴的探测概率偏低，因此协调开展射电与X射线联合观测在执行层面极具难度。我们提出一种利用X射线卫星XMM-Newton与帕克斯/穆里扬射电望远镜（Parkes/Murriyang）约束相关理论模型的新方案：我们计划借助帕克斯望远镜开展同步观测，在XMM-Newton同时覆盖的天区中搜寻新的快速射电暴。本次观测将瞄准邻近（低红移，low-z）星系的常规XMM观测天区，以提升探测潜在伴随X射线辐射的概率。若在射电波段探测到快速射电暴，我们将确保获得同步的X射线覆盖数据，并可获取伴随X射线光谱与光变曲线的详细信息——所有XMM-Newton的观测数据均会在观测完成一年后公开。