Parkes observations for project P1171 semester 2022OCTS_01

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.\r\n\r\nBecause 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，学界已提出大量相关理论模型。诸多理论模型预言FRB会伴随多波段辐射，但此前针对FRB的光学、X射线或伽马射线对应体的搜寻工作均未取得任何可靠探测结果。银河系磁星（magnetar）SGR 1935+2154A已被观测到同时发射类FRB爆发与X射线耀斑，这表明河外FRB源或许也存在X射线对应体。 由于X射线卫星的部署与运营成本高昂，且其视场范围较小导致FRB的探测概率相对偏低，因此协调开展射电与X射线联合观测在组织实施上存在极大难度。我们提出了一种全新的研究方案：依托XMM-Newton X射线卫星与Parkes/Murriyang射电望远镜，对FRB相关理论模型施加约束。具体而言，我们计划使用Parkes望远镜开展同步观测，在XMM-Newton同时覆盖的天区内搜寻新的FRB。本次观测的目标为邻近（低红移，low-z）星系的常规XMM观测天区，因为这类天体此前已被证实为FRB宿主星系。若在射电波段成功探测到FRB，我们将获得同步的X射线覆盖数据，并可获取其伴随的X射线光谱与光变曲线的详细信息。