Parkes observations for project P1171 semester 2023OCTS_12

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）的起源尚未明确，学界已提出诸多相关理论模型。部分模型预言其伴随多波段辐射，但此前针对FRBs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。银河磁星SGR 1935+2154A被观测到同时爆发类FRB暴与X射线耀斑，这一发现暗示河外FRB源或许也存在对应的X射线辐射。 受限于X射线卫星高昂的研制与运行成本，且此类卫星视场狭小导致FRB探测概率相对偏低，协调开展射电与X射线联合观测在实施组织层面极具挑战。为此我们提出一种全新研究方案：借助XMM-牛顿（XMM-Newton）X射线卫星与帕克斯/穆里扬（Parkes/Murriyang）射电望远镜，对FRB相关理论模型施加观测约束。本研究计划依托帕克斯望远镜开展同步覆盖观测，在XMM-牛顿同时覆盖的天区中搜寻新的FRB事件。我们将瞄准邻近（低红移）星系的常规XMM观测天区，以提升探测伴随X射线辐射的概率。若在射电波段成功探测到FRB，我们将确保获取同步的X射线观测数据；且由于所有XMM-牛顿观测数据均会在观测完成一年后公开，我们将能够获得对应体的X射线光谱与光变曲线的详细信息。