HXMT卫星快视成像

硬X射线调制望远镜(Hard X-ray Modulation Telescope,HXMT)的最重要的工作模式是扫描观测,包括巡天扫描观测和小天区深度扫描观测. HXMT的标准成像需要被观测天区完整的二维扫描观测数据,而同时利用HXMT的观测数据中包含的空间调制信息和旋转调制信息,快视成像可以在只有一维扫描的情况下获得被观测天区的较粗略的流强分布,从而可以在卫星的视场扫过一块天区后很快给出被观测天区的尽可能多的信息.本文详细介绍了快视成像的过程,并通过模拟计算给出了巡天扫描观测快视成像的灵敏度、定位精度和角分辨能力的分布.快视成像能提高HXMT发现暂现源的灵敏度,及时发现并定位出现在HXMT视场中的高能爆发现象,减少较强的暂现源和爆发对标准成像干扰将是标准成像的重要补充.

HXMT Quick-look Imaging Method

The most important working mode of HXMT(Hard X-ray Modulation Telescope)is scanning mode,which includes all-sky imaging survey mode and small region scanning mode.The standard imaging analysis requires complete data of two dimensional observations in the region of interest.By using the information of space modulation and rotating modulation contained in the observed data simultaneously,quick-look imaging can obtain the intensity distribution with data of one dimensional observation.Thus quick-look imaging can obtain the image of a region soon after HXMT scan through it.The technique of HXMT quick-look imaging is described in this paper in detail.And later in this paper the distribution of sensitivity and locating accuracy of HXMT quick- look are analyzed based on numeric simulation.The quick-look imaging can improve the sensitivity of HXMT for transient sources,discover and locate high energy bursts in the FOV of HXMT,reduce the disturbance of transient sources and bursts to the standard imaging.It will be an important supplement to the standard imaging analysis.