ASKAP Data Products for Project AS201 (EMU): images and visibilities

EMU is the touchstone radio continuum survey of the southern hemisphere. EMU will image the southern sky to a sensitivity of 20 microJy rms with a resolution of 15 arcsec. Over the initial five years of full ASKAP operations EMU is expected to detect and catalogue about 40 million galaxies, including typical star-forming galaxies over the latter half of the history of the Universe, powerful starbursts to even greater distances, and supermassive black holes in galaxies to the edge of the visible Universe. It will continue to discover new classes of object, and enable research covering the linked evolution of galaxies and their supermassive black holes, the large scale structure and cosmology of our Universe, the astrophysics of galaxy clusters and halos, and the formation of stars and the stellar lifecycle within our Milky Way and nearby galaxies. EMU will provide a lasting legacy as the most sensitive wide area atlas of the southern radio sky for decades to come.EMU是南半球基准射电连续谱巡天（touchstone radio continuum survey）。该项目将对南天开展成像观测，其成像灵敏度可达20微央斯基均方根（microJy rms），空间分辨率为15角秒（arcsec）。在ASKAP全面运行的最初五年周期内，EMU预计将探测并编目约4000万个星系，其中涵盖宇宙历史后半叶的典型恒星形成星系、可延伸至极远距离的强星暴星系，以及位于可见宇宙边缘的星系中超大质量黑洞（supermassive black holes）。该项目还将持续发现新的天体类别，并支撑多维度研究：包括星系与其超大质量黑洞的协同演化、宇宙的大尺度结构与宇宙学、星系团与星系晕的天体物理学，以及银河系与近邻星系内的恒星形成过程与恒星生命周期。在未来数十年间，EMU将作为南天射电天空最灵敏的广域巡天图集，留下持久的科学遗产。