微弱的射电天空：射电天文学成为主流
The faint radio sky: radio astronomy becomes mainstream
摘要：
射电天文学已经改变。多年来，它研究了相对罕见的源，这些源在整个电磁波谱中发射的大多是非热辐射，即射电类星体和射电星系。现在，它已经达到了如此微弱的通量密度，以至于它主要探测恒星形成星系和更常见的无线电安静的活动星系核。这些来源构成了河外天空的大部分，已经在红外，光学和X射线波段研究了几十年。我遵循射电天文学的转变，通过回顾射电天空的主要组成部分，在明亮和暗淡的两端，他们的正确分类的问题，他们的数量计数，光度函数，和演变。这些结果的整体“大画面”的天体物理学的影响，以及它们的相关性在河外天文学的一些热门话题，也进行了讨论。微弱无线电天空的未来前景非常光明，因为我们很快就会被调查数据淹没。这篇评论应该对所有河外天文学家都有用，不管他们喜欢的电磁波段是什么，甚至恒星天文学家也会觉得有点令人满意。
英文摘要：
Radio astronomy has changed. For years it studied relatively rare sources, which emit mostly non-thermal radiation across the entire electromagnetic spectrum, i.e. radio quasars and radio galaxies. Now it is reaching such faint flux densities that it detects mainly star-forming galaxies and the more common radio-quiet active galactic nuclei. These sources make up the bulk of the extragalactic sky, which has been studied for decades in the infrared, optical, and X-ray bands. I follow the transformation of radio astronomy by reviewing the main components of the radio sky at the bright and faint ends, the issue of their proper classification, their number counts, luminosity functions, and evolution. The overall "big picture" astrophysical implications of these results, and their relevance for a number of hot topics in extragalactic astronomy, are also discussed. The future prospects of the faint radio sky are very bright, as we will soon be flooded with survey data. This review should be useful to all extragalactic astronomers, irrespective of their favourite electromagnetic band(s), and even stellar astronomers might find it somewhat gratifying.
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。
