论文标题
用微通道X射线望远镜在SVOM卫星上定位和表征X射线源的分析方法
Analysis methods to localize and characterize X-ray sources with the Micro-channel X-ray Telescope on board the SVOM satellite
论文作者
论文摘要
SVOM是针对高能瞬态天体物理物体（例如伽马射线爆发）的中国法国太空任务。频谱的软X射线部分被微通道X射线望远镜（MXT）覆盖，该望远镜是一个狭窄的场望远镜，旨在精确定位X射线源。本文介绍了在板载上实施的方法，以用MXT表征和本地化X射线源。开发了一种特定的定位方法来适应MXT的光学系统，该方法基于“龙虾眼”放牧的小孔光学器件。该算法首次利用互相关技术将其定位精度降至2个Arcmin，少于200个光子，这确保了SVOM会观察到的大多数伽马射线爆发的快速随访。在本文中，我们还研究了算法的局限性并表征了其性能。
SVOM is a Sino-French space mission targeting high-energy transient astrophysical objects such as gamma-ray bursts. The soft X-ray part of the spectrum is covered by the Micro-channel X-ray Telescope (MXT) which is a narrow field telescope designed to precisely localize X-ray sources. This paper presents the method implemented on-board to characterize and localize X-ray sources with the MXT. A specific localization method was developed to accommodate the optical system of the MXT, which is based on "Lobster-Eye" grazing incidence micro-pore optics. For the first time, the algorithm takes advantage of cross-correlation techniques to achieve a localization accuracy down to 2 arcmin with less than 200 photons, which guarantees a rapid follow-up for most of the gamma-ray bursts that SVOM will observe. In this paper, we also study the limitations of the algorithm and characterize its performance.
