标题： 深场：微弱的亚豪焦和微豪焦射电天空——甚长基线干涉测量视角 显示英文标题

标题： Deep Fields: The Faint sub-mJy and microJy Radio Sky - A VLBI Perspective

摘要： 直到最近，甚长基线干涉测量（VLBI）的目标几乎完全来自天空中最亮且最紧凑的射电源，其典型流量密度远超几十个毫焦耳/平方秒。 这些源大多被确认为活动星系核（AGN），位于宇宙学距离上。 在本次讲座中，我将尝试总结目前关于次毫焦耳和微焦耳射电源群体的一般性质，这些性质是通过深度多波段研究哈勃深场北区（HDF-N）得出的。 特别是，我将试图提供一个VLBI视角，描述HDF的首次深度、宽视场VLBI试点观测及其主要结果的总结。 此外，还讨论了VLBI在未来高分辨率研究微弱射电源方面可能发挥的作用。 显示英文摘要

摘要： Until recently, VLBI targets have been drawn almost exclusively from the brightest and most compact radio sources in the sky, with typical flux densities well in excess of a few tens of mJy. These sources are predominantly identified with Active Galactic Nuclei (AGN), located at cosmological distances. In this lecture I will attempt to summarise what is currently known about the general properties of the faint sub-mJy and microJy radio source population, as determined from deep multi-wavelength studies of the HDF-N. In particular, I will try to provide a VLBI perspective, describing the first deep, wide-field, VLBI pilot observations of the HDF, together with a summary of the main results. The role VLBI can play in future high resolution studies of faint radio sources is also addressed.