GRAVITY：到达Sgr A* 的事件视界
GRAVITY: getting to the event horizon of Sgr A*
摘要：
我们介绍了第二代VLTI仪器重力，目前正处于初步设计阶段。引力是专门设计来观察接近银河系中心的大质量黑洞Sgr A* 的事件视界的物质的高度相对论运动。我们已经确定了实现这一目标所需的关键设计特征，并提出了由此产生的仪器概念。它包括一个集成的光学，4望远镜，双馈光束组合器在低温容器中操作;近红外波前传感自适应光学;条纹跟踪的VLTI的视野内的二次源和一个新的计量概念。模拟结果表明，计划的设计符合科学需要，特别是10微弧秒天体测量是可行的源与K=15的星等，如Sgr A*，提供合适的相位参考源。
英文摘要：
We present the second-generation VLTI instrument GRAVITY, which currently is in the preliminary design phase. GRAVITY is specifically designed to observe highly relativistic motions of matter close to the event horizon of Sgr A*, the massive black hole at center of the Milky Way. We have identified the key design features needed to achieve this goal and present the resulting instrument concept. It includes an integrated optics, 4-telescope, dual feed beam combiner operated in a cryogenic vessel; near infrared wavefront sensing adaptive optics; fringe tracking on secondary sources within the field of view of the VLTI and a novel metrology concept. Simulations show that the planned design matches the scientific needs; in particular that 10 microarcsecond astrometry is feasible for a source with a magnitude of K=15 like Sgr A*, given the availability of suitable phase reference sources.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
