脉冲星B1822-09 8小时GMRT观测的模态序列和动态发射特性
Modal Sequencing and Dynamic Emission Properties of an 8-hour GMRT Observation of Pulsar B1822-09
摘要：
这里介绍的研究检查了由巨型米波射电望远镜拍摄的脉冲星B1822-09的8小时观测。已知B1822-09表现出两种稳定的发射模式，B模式，其中前体（PC）“开启”，以及Q模式，其由脉冲间（IP）发射定义。我们对这一超长观测的分析结果表明，B1822-09表现出至少三种其他发射行为，这些行为在其他类似的恒星或B1822-09的其他观测中从未见过。这三种行为可以描述为：Q模式发射与PC发射，B模式发射与IP发射，以及当从一种模式转换到另一种模式时PC和IP都“打开”的情况。脉冲结构已被发现比以前认为的更复杂。MP有一个内锥/核心三重（T）配置以及一个中央视线导线。IP是一个15/degr宽的区域，与MP一起起源于开放的偶极场。PC排放来自一个仍然未知的来源。我们认为，PC的发射出现在同一地区的MP，但可能来自更高的磁层。总体而言，我们的分析强烈表明，模式的变化允许两个磁极区域之间的信息传递，并有助于全球磁层的变化。
英文摘要：
The research presented here examines an 8-hour observation of pulsar B1822-09,taken by the Giant Metrewave Radio Telescope. B1822-09 has been known to exhibit two stable emission modes, the B-mode, where the precursor (PC) `turns-on', and the Q-mode, which is defined by interpulse (IP) emission. The results of our analysis, of this extremely long observation, have shown that B1822-09 exhibits at least three other emission behaviors that have not been seen before in other similar pulsars or in other observations of B1822-09. These three behaviors can be described as: Q-mode emission with PC emission, B-mode emission with IP emission, and instances where both the PC and IP are `on' when transitioning from one mode to the other. The pulse structure has been found to be more complex than previously thought. The MP has an inner cone/core triple (T) configuration together with a central sightline traverse. The IP is a 15/degr-wide region, that along with the MP originate from an open dipolar field. The PC emission comes from a still unknown source. We argue that the PC emission arises within the same region as the MP, but likely comes from higher in the magnetosphere. Overall, our analyses strongly suggest that mode changes allow information transfer between the two magnetic polar regions and contribute to global magnetospheric changes.
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