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arXiv 2301.12342astro-ph.HE
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佳木斯脉冲星观测:IV。PSR B0329 +54的核心弱模式

Jiamusi pulsar observations: IV. The core-weak pattern of PSR B0329+54

Tao Wang, J. L. Han, C. Wang, P. F. Wang, D. J. Zhou

摘要:

明亮的脉冲星PSR B 0329 +54多年来一直被认为有两种发射模式。对单个脉冲的灵敏观测表明,脉冲轮廓的中心分量(称为核心分量)在某些周期内偶尔会非常弱,然后又恢复。这是新发现的核心弱模式。利用佳木斯66米望远镜2250 MHz对PSR B 0329 +54的长期观测,发现单个脉冲的波形分量,包括核、峰和尾峰的波形分量,在核弱模前后都有一定的周期变化,在周期折叠脉冲训练序列的相位-时间图上形成有规律的图形。该模式具有类似的结构的核心弱模式的时间尺度为3至14个周期。它开始于核心分量的拖尾相位处的强度增亮,然后核心强度下降到非常低的水平,就好像核心分量在一两个周期内从正常辐射窗口漂移出来。然后,尾随分量的强度增强,然后,领先分量出现在一个先进的阶段。这种弱核模式持续了几个时期。最后,芯弱模式在芯分量的前导相位处以增强的强度结束,就好像芯逐渐回来并且最终像以前一样停留在轮廓中心的相位处。

英文摘要:

The bright pulsar PSR B0329+54 was previously known for many years to have two emission modes. Sensitive observations of individual pulses reveal that the central component of pulse profile, which is called core component, is found to be very weakened occasionally for some periods and then recovered. This is the newly identified core-weak mode. Based on our long observations of PSR B0329+54 by the Jiamusi 66-m telescope at 2250 MHz, we report here that the profile components of individual pulses, including these for the core and the leading and trailing peaks, are relatedly varying over some periods even before and after the core-weak mode, forming a regular pattern in the phase-vs-time plot for a train of period-folded pulses. The pattern has a similar structure for the core-weak mode with a time scale of 3 to 14 periods. It starts with an intensity brightening at the trailing phase of the core component, and then the core intensity declines to a very low level, as if the core component is drifting out from the normal radiation window within one or two periods. Then the intensity for the trailing components is enhanced, and then the leading component appears at an advanced phase. Such a core-weak mode lasts for several periods. Finally, the core-weak mode ends up with an enhanced intensity at the leading phase for the core component, as if the core gradually comes back and finally stays at the phase of the profile center as it used to.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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