2023年8月17日,

使用的五百米口径球面射电望远镜(FAST),汉锦教授领导的研究小组从中国科学院国家天文台(国家)已经检测到不同的“矮脉冲”从一个明亮的脉冲星PSR B2111 + 46,和研究射电辐射的前所未有的细节和探索未知的物理磁气圈。来源:中国天文学会使用五百米口径球面射电望远镜(FAST),汉锦教授领导的研究小组从中国科学院国家天文台(国家)已经检测到不同的“矮脉冲”从一个明亮的脉冲星PSR B2111 + 46,和研究的射电辐射前所未有的细节和探索未知的物理磁气圈。本研究天文学8月17日发表在《自然》杂志上。通常脉冲星发出周期性的无线电信号。然而,一些旧的脉冲星偶尔淬火对一些时期,这种现象被称为“脉冲调零。“也许不能产生粒子的磁气圈由于条件不当或磁场结构的变化和辐射区域,或该地区创建粒子,然后淹没等离子体产生的其他领域。的确切原因缺乏脉冲星的辐射是一个谜,因为它无法探测的物理状态脉冲星的磁气圈辐射时熄灭。PSR B2111 + 46是相对旧的脉冲星,和科学家早就知道这个脉冲星辐射经常取消一段时间。然而,数十名异常疲软,很窄的脉冲-以前发现了普通调零时期偶然出现的时候观察到8月24日,8月26日,9月17日,2020年,作为银河盘面脉冲星快照调查的一部分,一个关键的项目快狩猎脉冲星。来验证这种新的发射状态,研究人员观察到,这颗脉冲星两个小时再3月8日,2022年。 “Finally, we picked out 175 such narrow, weak pulses,” said Dr. CHEN Xue, the first author of the study. According to Dr. CHEN, such pulses stand out from normal pulses in terms of pulse width and energy, and thus have been named “dwarf pulses.” Whereas normal individual pulses emit radiation through a “thunderstorm” of particles produced by copious discharges in regularly formed gaps near the pulsar’s magnetic poles, dwarf pulses are produced by one or a few “raindrops” of particles generated by pair production in a fragile gap of this near-death pulsar. These sporadic, weak, and narrow pulses constitute a new radiation state independent of normal pulses, and such pulses often exhibit a rare reversed spectrum, i.e., they have much stronger emission at higher radio frequencies, something that is very rarely detected in such a distinguished timescale from astronomical sources. “The properties of such dwarf pulses would be hard to be measured by other radio telescopes than FAST,” said Prof. HAN, “and measurements of such a new population of dwarf pulses reveal that the magnetic field structure for the pulsar radiation remains unchanged even when the radiation is almost ceased.” “In fact, a smaller number of dwarf pulses have also been detected from a few other pulsars,” said YAN Yi, co-first author of the study. “Detailed studies of such a dwarf pulse population could uncover some mysteries of unknown pulsar radiation processing and reveal the extreme plasma state in the pulsar magnetosphere.” Journal