Super eye in the sky as a whole finished receiving the 1351 light-years pulsar signal | | pulsar electromagnetic waves _ news

Original title: super eye 1351 light-years received pulsar signal

China's 500 meter aperture spherical radio telescope (FAST)

In China's 500-meter aperture spherical radio telescope (FAST) the occasion of the completion of the overall project, researchers in the recently approved a pilot observation, successfully received from 1351 light-years pulse signal from a pulsar, which is FAST since the experimental observations, receives the best quality set of electromagnetic signals. Access to this set of signals, FAST help researchers further analysis the performance index and the subsequent commissioning of the telescope. Try observing and debugging will continue for some time in the future, until the telescope to achieve the best performance.

　　These electromagnetic waves around 1351 years ago

Since mid-September this year, FAST project researchers will begin to pilot the radio telescope observations. In an observation on September 17, FAST telescope successfully received a set of high quality pulsar signals from a distant universe. This signal is FAST since the trial observation, receives a high signal to noise ratio of electromagnetic signals. From the access frequency and phase diagram, the researchers calculated the pulsar and the distance of the Earth.

National astronomical observatories, Chinese Academy of Sciences Associate Professor Qian Lei said that the observations of the pulsar the best data is J1921+2153 the star data. This is a pulsar at 1351 light-years away, meaning that now receive these electromagnetic waves around 1351 previously issued.

　　Can be inferred by low frequency electromagnetic wave distance

As the pulsar's rotation speed will gradually slow the energy difference between the rotational speed will be converted into radiation, which was received FAST telescopes. Researchers access to these FAST after a preliminary analysis of the raw data, and get two tickets for the pulse frequency and phase diagrams.

According to experts, different frequencies of electromagnetic waves in the interstellar medium velocity and path are not the same, so researchers take advantage of the phenomenon should be able to deduce the pulsar and the distance between the Earth. Qian Lei introduces high-frequency electromagnetic waves reach Earth, low frequency electromagnetic waves there will be a delay. Then when the distance from the big time, have greater delays; when the nearer the time delay is relatively small. Delayed amount can be used to deduce the pulsar to the distance between the Earth.

　　Pulsars spin extremely fast with super strong magnetic fields

Pulsar in the universe has the ultra strong magnetic fields and very fast spinning neutron stars. First discovered pulsars in 1967 by Bell, the scientist. The discovery of pulsars, known as one of the four major astronomical discoveries in the 1960 of the 20th century. Pulsar the diameter of most 10-kilometer, they spin very fast, some pulsars spin hundreds of times per second.

For example Qian Lei said, could conceivably be a lighthouse by the sea. Inside light is rotated, so that people will see the light, but don't see, in fact, pulsars, also known as the beacon of light in the universe.

　　Extension

　　China to build solid "eye in the sky" cluster

Today, with "super eye in the sky," said the 500-meter aperture spherical telescope (FAST) in pingtang in Guizhou Karst depressions opening, attracting the eye of the world.

Telescope "lid" larger and more sensitive, 500 m "super eye in the sky" just how sensitive? Scientists, for example, someone is talking on the cell phone on the Moon, can not escape its "eyes".

As planned, the FAST and 5 other telescopes in China "eye in the sky" – very long baseline interferometry network and leading international radio-frequency measurements in the field of network, so we can get better celestial hyperfine structure.

5-10 years in the future, large items such as radio just before the waves of China's large telescope construction. It is understood that China 12-meter optical infrared telescopes have been initial assessment by experts, is expected to be the "Thirteen-Five" plan during the project.

12-meter optical infrared telescopes will be built for the dark energy essence, gravitational waves optics certification and research, Earth-like planets outside our solar system detection, supermassive black holes, the first generation of stars and other cutting-edge science issues to provide internationally competitive observation platform.

The end of this year, China will launch self-developed hard x-ray modulation telescope satellite, it can in a wide-band large area x-ray Sky Survey images, unique observations of black holes, neutron stars and other high energy multi-band x-ray rapid variability of celestial bodies, and can monitor the skies for high-energy bursts.

Three-dimensional fighting a telescope the cluster will not only boost China's astronomical science and technological innovation capabilities, but also widely used in navigation, location, space, deep space exploration and other fields.

Responsible editor: Wei chun

Article keywords:
Pulsar waves

I want feedback
Save a Web page
Chongqing morning post

超级天眼整体完工 可接收1351光年外脉冲星信号 |脉冲星|电磁波_新闻资讯

　　原标题：超级天眼收到1351光年外脉冲星信号

中国500米口径球面射电望远镜（FAST）

　　在中国500米口径球面射电望远镜（FAST）整体工程完工之际，科研人员在近日通过一次试验性观测，成功接收到来自1351光年外一颗脉冲星发出的脉冲信号，这是FAST进行试验性观测以来，接收到的质量最好的一组电磁波信号。这组信号的获取，有利于科研人员进一步分析FAST望远镜的性能指标及后续的调试。这样的试观测和调试将在未来的一段时间内持续进行，直到望远镜达到最佳的性能指标。

　　这些电磁波约在1351年前发出

　　今年9月中旬以来，FAST工程科研人员便开始对射电望远镜进行试验性观测工作。在9月17日的一次观测中，FAST望远镜成功接收到了一组来自遥远宇宙的高质量脉冲星信号。这组信号是FAST投入试观测以来，接收到的性噪比最高的电磁波信号。从获取的频率相位图中，科研人员计算出这颗脉冲星与地球的距离。

　　中科院国家天文台副研究员钱磊表示，此次观测得到的最好的脉冲星数据是J1921+2153这颗星的数据。这是一颗位于1351光年以外的一颗脉冲星，意思就是说，现在接收到的这些电磁波大约是1351年以前发出的。

　　可通过低频率电磁波推断距离

　　由于脉冲星在自转时速度会逐渐变慢，其转动快慢之间的能量差就会转化为辐射，从而被FAST望远镜所接收。科研人员对这些FAST获取的原始数据初步分析后，得到两张该脉冲信号的频率相位图。

　　据专家称，不同频率的电磁波在星际介质中的传播速度和路径是不一样的，因此科研人员利用这个现象就能推断出这颗脉冲星与地球之间的距离。钱磊介绍，高频率的电磁波先到达地球，低频率的电磁波会有一个延迟。然后当传播距离大的时候，延迟的量就比较大；当距离比较近的时候，延迟的量就比较小。而延迟的量就可以用来推断脉冲星到地球之间的距离。

　　脉冲星旋转极快具有超强磁场

　　脉冲星是宇宙中具有超强磁场并极快地旋转的中子星。脉冲星在1967年被女科学家贝尔首次发现。脉冲星的发现，被称为二十世纪六十年代的四大天文学发现之一。脉冲星的直径大多为10千米，它们旋转速度极快，有的脉冲星每秒可以自转几百圈。

　　钱磊打比方称，可以想象成是海边的一个灯塔。它里面的灯是旋转的，这样人就会时而看到它的光，时而又看不到，实际上脉冲星也被称为宇宙中的灯塔。

　　■延伸

　　中国打造立体化“天眼”集群

　　今天，有着“超级天眼”之称的500米口径球面射电望远镜（FAST）将在贵州平塘的喀斯特洼坑中落成启用，吸引着世界目光。

　　望远镜“锅盖”越大越灵敏，500米的“超级天眼”究竟有多灵敏？科学家打了个比方，有人在月亮上用手机打电话，也逃不过它的“眼睛”。

　　按计划，FAST将和中国其他5座射电望远镜组成“天眼”群——甚长基线干涉测量网，并主导国际射电领域的低频测量网，从而更好地获取天体超精细结构。

　　未来5至10年，大射电等项目只是中国大望远镜建设浪潮的前浪。据了解，中国12米光学红外望远镜已初步通过专家评审，有望于“十三五”规划期间立项。

　　12米光学红外望远镜建成后将为暗能量本质、引力波源光学认证和研究、太阳系外类地行星探测、超大质量黑洞、第一代恒星等前沿科学问题提供在国际上有竞争力的观测平台。

　　今年年底，中国将发射自主研制的硬X射线调制望远镜卫星，它可以进行宽波段大天区X射线巡天成像，具有独特的观测黑洞、中子星等高能天体多波段X射线快速光变的能力，并可以监视天空的高能爆发现象。

　　立体化作战的望远镜集群，不仅将大幅提升中国在天文科学与技术方面的自主创新能力，还能广泛应用于导航、定位、航天、深空探测等领域。

责任编辑：隗俊

文章关键词：
脉冲星 电磁波

我要反馈
保存网页
重庆晨报