磁星是具有强磁场的中子星。 与csiro天文学家一起，来自物理学院的manishacaleb博士发现了被发现的最强大的磁体之一xtej1810-197，这与现有理论不太相符。 艺术家对磁星的印象。 资料来源：卡尔·诺克斯、奥兹格拉夫/斯温本东南方的天文学家使用csiro位于帕克西北部的射电望远镜murriyang，探测到了来自一颗先前休眠的恒星的异常无线电脉冲，该恒星具有强大的磁场。 今天发表在《自然天文学》上的新结果描述了来自磁星xtej1810-197的无线电信号以复杂的方式表现。 磁星是一种中子星，是宇宙中最强的磁体。 这颗磁星距离地球大约8000光年，也是已知距离地球最近的一颗。 众所周知，大多数磁星都会发出偏振光，尽管这颗磁星发出的光是圆偏振的，当它在太空中移动时，光看起来是螺旋形的。 澳大利亚国家科学机构csiro的博士后marcus lower博士领导了这项研究，并表示研究结果出乎意料，完全是前所未有的。 “与我们从其他磁星上看到的无线电信号不同，这颗磁星正在发射大量快速变化的圆偏振。 lower博士说：“我们以前从未见过这样的情况。”。 manisha caleb博士。 合著者之一、悉尼大学物理学院和天文学研究所的manishacaleb博士说，研究磁星可以深入了解强磁场的物理性质及其产生的环境。 她说：“从这颗磁星发出的信号表明，恒星表面的相互作用比以前的理论解释更为复杂。”。 探测来自磁星的无线电脉冲已经极为罕见：xtej1810-197是已知的少数几个产生这种脉冲的天体之一。 虽然不确定为什么这颗磁星的行为如此不同，但研究小组有一个想法。 艺术家对磁星的印象音频是无线电数据的翻译。 注：在这项研究中不是来自磁星。 来源：csiro“我们的研究结果表明，磁星磁极上方有一个过热的等离子体，其作用就像一个偏振滤波器，”lower博士说。 “等离子体究竟是如何做到这一点的还有待确定。 xtej1810-197于2003年首次被观测到发射无线电信号。 然后它沉寂了十多年。 2018年，位于乔德雷尔银行天文台的曼彻斯特斯大学76米长的洛弗尔望远镜再次探测到了这些信号，并迅速由位于帕克斯的穆里扬跟进，从那时起，这对观测磁星的无线电发射至关重要。 默里杨csiros-parkes射电望远镜。 资料来源：csirot位于维拉格里的64米直径望远镜配备了尖端的超宽带接收器。 该接收器是由csiro的工程师设计的，他们是开发射电天文学应用技术的世界领导者。 该接收器可以更精确地测量天体，尤其是磁星，因为它对宽无线电频率范围内亮度和偏振的变化非常敏感。 对这类磁星的研究可以深入了解一系列极端和不寻常的现象，如等离子体动力学、x射线和伽马射线的爆发，以及潜在的快速射电爆发。 researchlower，m等人，“磁星极化无线电发射中的线性到圆形转换”，自然天文学，第8卷（2024）。 doi:10。 1038/s41550-024-02225-8承认研究人员承认维拉德里人是中国国际空间研究组织的帕克斯射电望远镜murriyang所在的帕克斯天文台遗址的传统守护者。 声明作者声明没有相互竞争的利益。 这项研究由澳大利亚研究委员会、中国国家自然科学基金会、荷兰研究委员会资助。magnetars are neutron stars with strong magnetic fields. with csiro astronomers, dr manisha caleb from the school of physics has found one of the most powerful magnets discovered - xte j1810-197 - and it doesnt quite fit existing theory.artists impression of a magnetar. credit: carl knox, ozgrav/swinburneastronomers using murriyang, csiro’s radio telescope at parkes nsw, have detected unusual radio pulses from a previously dormant star with a powerful magnetic field.new results published today in nature astronomy describe radio signals from magnetar xte j1810-197 behaving in complex ways.magnetars are a type of neutron star and the strongest magnets in the universe. at roughly 8000 light years away, this magnetar is also the closest known to earth.most magnetars are known to emit polarised light, though the light this magnetar is emitting is circularly polarised, where the light appears to spiral as it moves through space.dr marcus lower, a postdoctoral fellow at australia’s national science agency csiro, led the research and said the results are unexpected and totally unprecedented.“unlike the radio signals we’ve seen from other magnetars, this one is emitting enormous amounts of rapidly changing circular polarisation. we have never seen anything like this before,” dr lower said.dr manisha caleb.co-author dr manisha caleb from the school of physics and university of sydney institute for astronomy said studying magnetars offers insights into the physics of intense magnetic fields and the environments these create.“the signals emitted from this magnetar imply that interactions at the surface of the star are more complex than previous theoretical explanations,” she said.detecting radio pulses from magnetars is already extremely rare: xte j1810-197 is one of only a handful known to produce them.while it’s not certain why this magnetar is behaving so differently, the team has an idea.artists mpression of a magnetaraudio is translation of radio data. nb: not from magnetar in this study. source: csiro“our results suggest there is a superheated plasma above the magnetars magnetic pole, which is acting like a polarising filter,” dr lower said.“how exactly the plasma is doing this is still to be determined.”xte j1810-197 was first observed to emit radio signals in 2003. then it went silent for well over a decade. the signals were again detected by the university of manchesters 76-metre lovell telescope at the jodrell bank observatory in 2018 and quickly followed up by murriyang at parkes, which has been crucial to observing the magnetar’s radio emissions ever since.murriyang csiros parkes radio telescope. source: csirothe 64-metre diameter telescope on wiradjuri country is equipped with a cutting-edge ultra-wide bandwidth receiver. the receiver was designed by csiro engineers who are world leaders in developing technologies for radio astronomy applications.the receiver allows for more precise measurements of celestial objects, especially magnetars, as it is highly sensitive to changes in brightness and polarisation across a broad range of radio frequencies.studies of magnetars such as these provide insights into a range of extreme and unusual phenomena, such as plasma dynamics, bursts of x-rays and gamma-rays, and potentially fast radio bursts.researchlower, m, et al, ‘linear to circular conversion in the polarized radio emission of a magnetar’, nature astronomy, vol 8 (2024). doi: 10.1038/s41550-024-02225-8acknowledgementthe researchers acknowledge the wiradjuri people as the traditional custodians of the parkes observatory site where murriyang, csiro’s parkes radio telescope, is located.declarationthe authors declare no competing interests. research was funded by the australian research council, national natural science foundation of china, dutch research council.本文来源： 一颗曾经休眠的磁中子星正在发出奇怪的偏振光
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