论文标题
VTXO：X射线观测的虚拟望远镜
VTXO: The Virtual Telescope for X-ray Observations
论文作者
论文摘要
用于X射线观测的虚拟望远镜（VTXO）将在虚拟X射线望远镜中使用轻质相位菲涅耳镜头（PFLS），$ \ sim $ \ sim $ 1 km focal focal Lengus，并且$ \ sim $ \ sim $ 50毫米Arcsececond Angular Angular分辨率。 VTXO是通过使用两个Smallsats的精确地层飞行来形成的：一个较小的光学效果，该光学系统容纳PFL和导航信标，而较大的检测器包含X射线摄像头，精确的启动跟踪器以及对编队飞行的推进。基线飞行动力学使用高度椭圆形的超同步轨道，使得该轨道可以在90,000公里的座位上保持惯性框架，在32.5小时的轨道中10个小时，持续近一年的任务寿命。 VTXO的精细角度分辨率可以测量靠近明亮紧凑型X射线源的中央引擎附近的环境。这种X射线成像能力可以研究靠近中心物体（例如CYG X-3和GX 5-1）的灰尘散射的影响，以搜索X射线射击物中紧凑型物体接近的射流结构，例如CYG X-1和GRS 1915+105，以及在Crabbab pulsar Windebula中寻找结构的搜索结构。描述了VTXO Smallsat和仪器设计，任务参数和科学表现。 VTXO开发受到支持，作为选定的2018年NASA天体物理学Smallsat研究（AS $^3 $）任务之一。
The Virtual Telescope for X-ray Observations (VTXO) will use lightweight Phase Fresnel Lenses (PFLs) in a virtual X-ray telescope with $\sim$1 km focal length and with $\sim$50 milli-arcsecond angular resolution. VTXO is formed by using precision formation flying of two SmallSats: a smaller OpticsSat that houses the PFLs and navigation beacons while a larger DetectorSat contains an X-ray camera, a precision start tracker, and the propulsion for the formation flying. The baseline flight dynamics uses a highly elliptical supersynchronous orbit allow the formation to hold in an inertial frame around the 90,000 km apogee for 10 hours of the 32.5 hour orbit with nearly a year mission lifetime. VTXO's fine angular resolution enables measuring the environments close to the central engines of bright compact X-ray sources. This X-ray imaging capability allows for the study of the effects of dust scattering near to the central objects such as Cyg X-3 and GX 5-1, for the search for jet structure near to the compact object in X-ray novae such as Cyg X-1 and GRS 1915+105, and for the search for structure in the termination shock of in the Crab pulsar wind nebula. The VTXO SmallSat and instrument designs, mission parameters, and science performance are described. VTXO development was supported as one of the selected 2018 NASA Astrophysics SmallSat Study (AS$^3$) missions.
