高灵敏度VLBI和FAST计划

High-sensitivity VLBI and the Project FAST

概述了ＶＬＢＩ天体物理的近期发展、主要成就及其受到的灵敏度制约，简要地回顾了目前还处在不太成熟阶段的低频ＶＬＢＩ的探索及近十余年中对提高ＶＬＢＩ灵敏度的硬件和软件两方面的尝试，并在此基础上，着重讨论了我国计划中的ＦＡＳＴ射电望远镜对提高ＶＬＢＩ灵敏度的可能贡献，展望了因为ＦＡＳＴ的参与而获得的中低频高灵敏度ＶＬＢＩ的天体物理课题及其意义。

Recent developments of VLBI astrophysics, including essential achievements and constraint posed by the sensitivity, is briefly described at first in this paper. Then a brief review of exploring on lower-frequency VLBI, which is still not so mature at the moment, and trying to improve sensitivity of VLBI in both hard and soft wares in the recede decade is presented. Finally it is emphasized to discuss a potential contribution of planned FAST on improvement of VLBI sensitivity and to bring forward a prospect on high-sensitivity VLBI astrophysics at lower and middle frequencies due to participation of the FAST in the future.