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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク European Pulsar Timing Array ： ウィキペディア英語版 European Pulsar Timing Array The European Pulsar Timing Array (EPTA) is a European collaboration to combine five 100-m class radio-telescopes to observe an array of pulsars with the specific goal of detecting gravitational waves. It is one of three pulsar timing array projects in operation, the others being the Parkes Pulsar Timing Array and the North American Nanohertz Observatory for Gravitational Waves. ==Pulsars and high-precision timing== Pulsars are rapidly rotating, highly magnetised neutron stars that emit radio waves from their magnetic poles that are, due to the star's rotation, observed on Earth as a string of pulses. Due to the extremely high density of neutron stars, their rotation periods are very stable, hence the observed arrival time of the pulses are highly regular. These arrival times are called TOAs (time of arrival) and can be used to perform high-precision timing experiments. The stability of the TOAs from most pulsars is limited due to the presence of red noise, also called "timing noise".〔Z. Arzoumanian, D.J. Nice, J.H. Taylor, and S.E. Thorsett. "(Timing behavior of 96 radio pulsars )." ''The Astrophysical Journal,'' volume 422, February 1994 (pages 671-680).〕 However, there is a special class of pulsars, called millisecond pulsars (MSP), that are shown to suffer from little or no timing noise. Keeping track of the TOAs of different MSPs over the sky allows for a high-precision timing experiment to detect gravitational waves. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「European Pulsar Timing Array」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.