Radio Observation in High Energy Astrophysics

高能天体物理学中的射电观测

• 批准号: 14204027
• 负责人: DAISHIDO Tsuneaki
• 金额: $ 30.95万
• 依托单位: Waseda University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14204027/
• 关键词: Radio Astronomy; X and Gamma-ray Astronomy; Cosmic Ray; Astrophysics; Relativity and Gravitational Waves; Antennas; Signal Processing; クェーサー; Bl Lac型天体; パルサー; ガンマ線天体; トランジェント電波源; 球面鏡; 空間時間FFT; 電波干渉計

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.

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。为了实现大视场搜索，我们还开发了数字信号处理系统.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。

项目成果

T.Daishido et al.: "Transient Star and Pulsar Survey in Nasu Pulsar Observatory (Ref N.-IAU02208)"IAU Symposium 218 Young Neutron Stars and their Environments. (発表予定). (2003)

T.Daishido 等人：“那须脉冲星天文台的瞬变星和脉冲星调查（参考号 N.-IAU02208）”IAU 研讨会 218 年轻中子星及其环境（即将提交）。

Langloir, D, Maeda, K, Wands, D: "Conservation Laws for Collisions of Branes and Shells in General Relativity"Phys.Rev.Letters. 88. 181301 (2002)

Langloir, D、Maeda, K、Wands, D：“广义相对论中膜和壳碰撞的守恒定律”Phys.Rev.Letters。

Nasu 1.4GHz Interferometer Transient Radio Source Survey and Improvement in Detection of Radio Sources

那须 1.4GHz 干涉仪瞬态射电源测量和射电源检测改进

• 发表时间: 2006
• 期刊: Journal of Conference Series(see below)http://www.iop.org/EJ/toc/1742-6596/31/1 31
• 作者: Matsumura;Kuniyoshi;Takefuji;K.Niinuma;K.Asuma;T.Daishido
• 通讯作者: T.Daishido

EGRET Unidentified Source Radio Observations and Performance of Receiver Gain Calibration

EGRET 不明源射电观测和接收机增益校准性能

• 发表时间: 2006
• 期刊: Journal of Conference Series(see below)http://www.iop.org/EJ/toc/1742-6596/31/1 31
• 作者: K.Niinuma;K.Asuma;M.Kuniyoshi;N.Matsumura;K.Takefuji,..;T.Daishido
• 通讯作者: T.Daishido

Ichikawa, H.,..., Daishido, T.: "Nyquist Rate Sampling Observation and Detection Limit in Nasu Pulsar Observatory"Proc.Frontier in Astroparticle Physics and Cosmology (Universal Academy Press, Inc.). (in press). (2004)

Ichikawa, H.,..., Daishido, T.：“那须脉冲星天文台的奈奎斯特率采样观测和检测极限”Proc.Frontier in Astropolide 物理和宇宙学（Universal Academy Press, Inc.）。