ASKAP Data Products for Project AS201 (EMU): catalogues

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是南半球射电连续谱巡天（radio continuum survey）的基准性项目。EMU将对南部天区开展成像观测，灵敏度可达20微央斯基均方根（microJy rms），分辨率达15角秒（arcsec）。在ASKAP全面运行的最初五年内，EMU预计将探测并编目约4000万个星系，其中包括宇宙历史后半段的典型恒星形成星系（star-forming galaxies）、乃至更远距离的强星暴星系（starbursts），以及位于可观测宇宙（visible Universe）边缘星系中的超大质量黑洞（supermassive black holes）。该巡天将持续发现新的天体类型，并为诸多研究提供支撑：涵盖星系与其超大质量黑洞的协同演化、宇宙的大尺度结构（large scale structure）与宇宙学（cosmology）、星系团（galaxy clusters）与星系晕（galaxy halos）的天体物理学，以及银河系（Milky Way）与近邻星系内的恒星形成与恒星演化周期（stellar lifecycle）。未来数十年间，EMU将作为南半球射电天空最灵敏的大天区巡天图集，留下持久的科学遗产。