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厉害啦!中国天眼发现新脉冲星 通过国际认证

2017-10-11 11:09:59   

参考消息网10月11日报道 港媒称,中科院国家天文台10月10日宣布,位于贵州的“中国天眼”(FAST)首次发现脉冲星,探测到数十个优质脉冲星候选体,其中6颗通过国际认证。这是内地射电望远镜首次发现脉冲星。

据《香港经济日报》网站10月10日报道,国家天文台举行新闻发布会,公布世界最大单口径射电望远镜FAST取得的首批成果。国家天文台研究员李菂表示,团组利用位于贵州师范大学的FAST早期科学中心进行数据处理,探测到数十个优质脉冲星候选体,其中6颗通过国际认证。

报道称,在这6颗脉冲星中,有两颗是今年8月22日、25日在南天银道面通过漂移扫描发现。它们分别是一颗编号J1859-0131,自转周期为1.83秒,据估算距离地球1.6万光年;一颗编号J1931-01,自转周期0.59秒,据估算距离地球约4100光年。

据了解,脉冲星由恒星演化和超新星爆发产生,因发射周期性脉冲信号而得名。脉冲星的本质是中子星,具有在地面实验室无法实现的极端物理性质,是理想的天体物理实验室,对航天器导航等重大科学及技术应用研究非常有帮助。

李菂称,银河系中有大量脉冲星,但由于其信号暗弱,易被人造电磁干扰淹没,目前只观测到一小部分。具有极高灵敏度的FAST望远镜是发现脉冲星的理想设备。未来,FAST将有希望发现更多守时精准的毫秒脉冲星,对脉冲星计时阵探测引力波作出贡献。

“中国天眼”

报道称,500米口径球面FAST位于贵州省平塘县,于2016年9月25日竣工,是目前世界最大的单口径射电望远镜,其接收面积相当于30个足球场大小。

此次发布会上公布了2颗脉冲星的具体信息,编号分别为J1859-0131和J1931-01。前者自转周期为1.83秒,距离地球约1.6万光年;后者自转周期为0.59秒,距离地球约4100光年。2颗脉冲星分别由FAST于今年8月22日、25日在南天银道面通过漂移扫描发现。

FAST工程副总工程师李菂介绍,FAST调试进展超过预期,并已开始系统的科学产出。目前已经探测到数十个优质脉冲星候选体,其中6颗通过国际认证。未来,FAST有望发现更多守时精准的毫秒脉冲星,对脉冲星计时阵探测引力波做出原创贡献。

搜寻和发现射电脉冲星是FAST的核心科学目标。宇宙中有大量脉冲星,但由于其信号暗弱,易被人造电磁干扰淹没,目前只观测到一小部分。具有极高灵敏度的FAST是发现脉冲星的理想设备。

脉冲星由恒星演化和超新星爆发产生,因发射周期性脉冲信号而得名。脉冲星的自转周期极其稳定,准确的时钟信号为引力波探测、航天器导航等重大科学及技术应用提供了理想工具。

澳大利亚科学及工业研究院Parkes望远镜科学主管乔治·霍布斯在发布会现场表示,FAST的调试以及逐渐产出成果,是目前国际天文学界最激动人心的事件之一。

“中国天眼”首次发现新脉冲星

FAST位于贵州省平塘县名为大窝凼的喀斯特洼地之中,其接收面积相当于30个足球场大小,是目前世界最大、最灵敏的单口径射电望远镜。

责任编辑:周晶晶 CN032
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