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arXiv 1906.02255astro-ph.HE
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PSR J0826 +2637(B0823 +26)不同模式下的无线电发射特征

Radio emission features in different modes of PSR J0826+2637 (B0823+26)

Rahul Basu, Dipanjan Mitra

摘要:

本文报道了利用巨型米波射电望远镜在306-339 MHz观测频率下对脉冲星J 0826 +2637(B 0823 +26)不同模式的射电辐射进行的详细分析。脉冲星的轮廓有一个postcursor和脉冲间发射除了主脉冲。单脉冲显示了零的存在,周期性波动的发射以及两个突出的模式。此外,脉冲星还显示存在一个空状态,在大约一个小时内没有看到发射,紧接着是一个短时间($\sim$ 5分钟)的明亮状态,称为Q亮状态。在这两种模式中,零陷变化很大,从B模式中的几个百分比零陷到Q模式中的90%以上零陷。此外,当主脉冲在B模式中为零时,脉冲星在脉冲间和后标分量中都表现出低水平发射。我们检测到的周期性波动的主脉冲和postcursor在B模式,这是最有可能的一种形式的周期性振幅调制无关的子脉冲漂移。我们还检测到的周期性的外观期间从零到突发状态的Q模式,这是长于B模式调制的过渡。我们的分析进一步揭示了一个显着增加的主脉冲和后光标的强度在过渡期间从Q模式的短持续时间Q亮模式。另一方面,在脉冲间强度中没有可见的相称变化。

英文摘要:

We report on a detailed analysis of the radio emission during the different modes of the pulsar J0826+2637 (B0823+26), observed using the Giant Meterwave Radio Telescope at 306-339 MHz observing frequencies. The pulsar profile has a postcursor and interpulse emission in addition to the main pulse. The single pulses showed the presence of nulling, periodic fluctuation in the emission as well as two prominent modes. In addition the pulsar also showed the presence of a null state where no emission was seen for roughly an hour which was immediately followed by a short duration ($\sim$5 minutes) bright state termed the Q-bright state. The nulling varied significantly in the two modes, from a few percent nulls in B-mode to more than 90 percent nulling during the Q-mode. Additionally, the pulsar showed the presence of low level emission in both the interpulse and postcursor components when the main pulse nulled in B-mode. We detected periodic fluctuations in both the main pulse and postcursor during B-mode which were most likely a form of periodic amplitude modulation unrelated to subpulse drifting. We have also detected the appearance of periodicity during the transitions from the null to the burst states in the Q-mode, which was longer than the B-mode modulations. Our analysis further revealed a significant increase in the main pulse and post-cursor intensity during the transition from the Q-mode to the short duration Q-bright mode. On the other hand no commensurate variation was visible in the interpulse intensity.

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