THE CLOSELY POSITIONED THREE RADIO TRANSIENTS IN THE NASU 1.4 GHz WIDE-FIELD SURVEY
THE CLOSELY POSITIONED THREE RADIO TRANSIENTS IN THE NASU 1.4 GHz WIDE-FIELD SURVEY
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NASU 1.4 GHz 广域调查中位置较近的三个无线电瞬变
DOI：
10.1088/0004-6256/138/3/787
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. Nakagawa
中科院分区：
文献类型：
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作者：
N. Matsumura;K. Niinuma;M. Kuniyoshi;K. Takefuji;K. Asuma;T. Daishido;S. Kida;T. Tanaka;T. Aoki;S. Ishikawa;K. Hirano;S. Nakagawa
2004年，我们启动了NASU 1.4 GHz宽视场观测，通过同时进行宽视场天空的监视来研究动态宇宙。我们已经探测到六个流量密度大于1Jy的射电瞬变。本文报道了在δ∼+41.°7漂移扫描观测中探测到的三个新的射电瞬变。根据它们在天空中的位置和通量密度，我们考虑了瞬变的候选天文天体类型。因此，这三个射电瞬变可能是与已知的银河系外源有关的大规模射电耀斑，例如活动星系核，它们在X射线和射电波长上通常非常微弱。这3个瞬变分布在2°×1°的天空中，而包括本文报道的3个瞬变在内的9个瞬变分布在银河系的高纬度和低纬度。根据观测结果，我们认为同时进行的广场测量将有助于寻找射电瞬变以研究动态射电天空。
In 2004, we started the Nasu 1.4 GHz wide-field survey to study the dynamic universe by simultaneously performing the surveillance of the wide-field sky. We have detected six radio transients with flux densities larger than 1 Jy. In this paper, we report the detection of three new radio transients in the drift-scanning observations at δ ∼ +41.°7. Based on their positions in the sky and flux densities, we considered the candidate types of astronomical objects for transients. As a result, it is suggested that the three radio transients could be massive radio flares associated with known extragalactic sources, such as active galactic nuclei, which are usually very faint in X-ray and radio wavelengths. The three transients were found in the sky of 2° × 1°, while nine transients, including the three transients reported in this paper, are distributed at both high and low Galactic latitude. According to the observational results, we suggest that the wide-field survey simultaneously performed would be useful in searching for radio transients to study the dynamic radio sky.