Radio Observation in High Energy Astrophysics

在那须天文台，用1.4GHz的球形碟形天线阵发现了射电瞬变源。这些发现在以下期刊中进行了研究。在X射线和伽马射线天文学以及光学天文学中，我们有大视场的设施来探测瞬态物体。其中一个例子是伽马射线暴。人们花了30多年的时间才明白它们是宇宙学上的物体。在无线电波中，银河平面上的瞬态源在70年代初就已为人所知。典型的一个是Cyg-X3，其中大约每年观察到一次大爆发。然而，在那须天文台于2000年开始观测之前，在银河系高纬度地区并没有发现无线电瞬变现象。我们以很低的成本研制了大型球面碟形阵列干涉仪。我们还开发了数字信号处理系统来搜索大视场。结果，我们在银河系高纬度地区发现了几个无线电瞬变现象。

In Nasu Observatory, Radio Transient Sources were discovered with spherical dish array at 1.4GHz. These discoveries were investigated in the following Journals. In X and Gamma-ray astronomy as well as in optical astronomy, we have facilities having large field of view to detect transient objects. One example was Gamma-ray Bursts. It took more than 30 years to understand they were cosmological objects. In radio waves, transient sources in Galactic plane were known in early seventies. Typical one was Cyg-X3, in which large outbursts were observed once a year or so. However, no radio transients was known at high Galactic latitudes until Nasu Observatory started observation in 2000. We have developed Large Spherical Dish Array Interferometer at very low cost. We also developed digital signal processing system to search large field of view. As a result, we found several radio transients at high Galactic latitudes.