Parkes observations for project P1171 semester 2022OCTS_11

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. 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, since objects of this type have been previously identified as FRB hosts. 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.快速射电暴（Fast Radio Bursts，FRBs）的起源至今仍未明确，学界已提出诸多理论模型以阐释其成因。部分模型预言快速射电暴会伴随多波段辐射，但此前针对快速射电暴的光学、X射线或伽马射线对应体的搜寻均未取得任何探测结果。观测发现银河系内的磁星SGR 1935+2154A同时爆发了类快速射电暴的脉冲与X射线耀斑，这表明河外快速射电暴源或许也存在X射线对应体。由于X射线卫星运营成本高昂，且其视场范围较小导致快速射电暴的探测概率相对偏低，因此协调开展射电与X射线联合观测在实施层面极具挑战。我们提出一种全新方案，借助X射线卫星XMM-Newton与帕克斯/穆里扬射电望远镜，对快速射电暴的理论模型施加约束：我们计划针对XMM-Newton已覆盖的天区，使用帕克斯望远镜开展伴生观测以搜寻新的快速射电暴。本次观测将以常规XMM-Newton观测的近邻（低红移）星系为目标，因为此类天体此前已被证实为快速射电暴的宿主星系。若在射电波段探测到快速射电暴，我们将可获得该暴的同步X射线覆盖数据，并获取其伴随的X射线光谱与光变曲线的详细信息。