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LOFAR - a new low-frequency radio telescope

机译：LOFAR - 一种新的低频无线电望远镜

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LOFAR, the Low Frequency Array, is a new low frequency telescope that is currently being built in the Netherlands, It will initially observe at frequencies from 30 to 240 MHz with baselines of up to 100 km. The aim for the second phase is to carry out sensitive observations below 30 MHz and to extend the maximum baselines up to 400 km. The design of LOFAR is driven by four fundamental astrophysical applications: (i) the epoch of reionisation; (ii) extra-galactic surveys and their exploitation to study the formation and evolution of clusters, galaxies, and black holes; (iii) transient sources and their association with high energy objects such as gamma ray bursts; and (iv) cosmic ray showers and their exploitation to study the origin of ultra-high energy cosmic rays Particularly relevant for this conference is LOFAR's ability to study the epoch of reionisation through observations of the redshifted 21 cm line. This will address several important issues including the source of reionisation and the reionisation history of the Universe, In addition to the science case, LOFAR's instrumental concepts and time line are briefly reviewed The main technical challenges for LOFAR include rejection of man-made radio interference, dealing with the corrupting influence of the ionosphere on the observations, and minimising contaminations of the EOR signal by foreground discrete astrophysical sources.
机译：LOFAR，低频阵列，是当前正在建在荷兰一个新的低频望远镜，它最初将观察的频率从30到240 MHz的可达100公里的基线。用于第二阶段的目的是进行敏感观测低于30兆赫和以延伸最大基线至400公里。 LOFAR的设计是由四个基本天体物理应用驱动：（ⅰ）再电离的时期; （ⅱ）外星系调查及开发研究的簇，星系，和黑洞的形成和演化; （ⅲ）瞬时源和它们的具有高能量的关联对象如伽马射线脉冲;及（iv）宇宙射线淋浴和对他们的剥削，研究本次会议特别相关的是LOFAR的通过红移21厘米线的观测研究再电离的时代能力超高能宇宙射线的起源。这将解决包括再电离源和宇宙的再电离历史上的几个重要问题，除了科学的情况下，LOFAR的工具性概念和时间线进行了简要回顾了LOFAR的主要技术挑战包括抑制人为的无线电干扰，处理电离层的上观测破坏的影响，并通过前景离散天体物理来源最小化EOR信号的污染。

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