Parkes observations for project P1171 semester 2023OCTS_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.\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）的起源仍不明确，目前存在大量关于其起源的理论模型。部分模型预测存在相关的多波段辐射，但此前针对FRBs的光学、X射线或伽马射线对应体的搜索均未获得任何探测结果。银河系磁星SGR 1935+2154A已被观测到同时发射类FRB爆发和X射线耀斑，这表明河外FRB源也可能存在X射线对应体。

由于X射线卫星成本高昂，且其视场较小导致FRB探测概率相对较低，协同的射电与X射线观测在后勤组织上极具挑战性。我们提出一种利用X射线卫星XMM-Newton和Parkes/Murriyang射电望远镜对理论模型施加约束的新方法：通过Parkes望远镜开展伴随观测，在XMM-Newton同时覆盖的天区内搜索新的FRBs。我们将XMM的常规观测目标锁定为近邻（低红移）星系，以提高探测潜在相关X射线辐射的几率。若在射电波段探测到FRB，由于所有XMM-Newton数据将在观测后一年内公开，我们将获得同步的X射线覆盖，并能获取相关X射线能谱和光变曲线的详细信息。