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arXiv 0802.0247astro-ph
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射电脉冲星J1819 +1305的“周期零点”

The `Periodic Nulls' of Radio Pulsar J1819+1305

Joanna M. Rankin, Geoffrey A. E. Wright

摘要:

我们提出了一个单脉冲研究的四分量脉冲星J1819+1305,其“零”脉冲聚束在约57倍的旋转周期的周期性间隔。零聚束之间的发射爆发表现出特征调制在两个较短的周期约6.2和3倍的旋转周期,前者发现主要是在两个外部组件,而后者只在第一个组件。许多爆发以第二分量的明亮发射开始,在整个轮廓宽度上表现出正的六周期漂移,并以领先分量的3周期调制结束。这个57周期的周期可以用几何方法模拟成一个稀疏填充的子光束旋转木马,每当我们的视线与一个循环的空区域相交时,就会出现空值。这种解释是兼容的周期性,旋转木马相关的零的其他最近的证据,似乎支持物理学的极隙发射模型的“漂移”的子脉冲,但微妙的结构的发射突发违抗一个简单的解释。

英文摘要:

We present a single-pulse study of the four-component pulsar J1819+1305, whose ``null'' pulses bunch at periodic intervals of around 57 times the rotation period. The emission bursts between the null bunches exhibit characteristic modulations at two shorter periodicities of approximately 6.2 and 3 times the rotation period, the former found largely in the two outer components, and the latter only in the first component. Many bursts commence with bright emission in second component, exhibit positive six-period drift across the full profile width, and end with 3-period modulation in the leading component. The 57-period cycle can be modelled geometrically as a sparsely filled subbeam carousel with nulls appearing whenever our line of sight intersects a circulating empty region. This interpretation is compatible with other recent evidence for periodic, carousel-related nulling and appears to support the physics of a polar-gap emission model for ``drifting'' subpulses, but the subtle structure of the emission bursts defies an easy explanation.

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