论文标题
Pushchino Multibeam Pulsar搜索-II。 rrats的长期变异性
Pushchino multibeam pulsar search -- II. Long-term variability of RRATs
论文作者
论文摘要
通过使用Pusphchino的大型阵列（LPA），已在110 MHz每日监视器计划中搜索了16个先前已知的旋转无线电瞬变（RRAT）的脉冲，为期4至5。5年。在如此长的观察间隔中检测到的脉冲总数仅为RRAT J0640+07的90个脉冲，或者对于RRAT J0302+22的脉冲高达10,751脉冲。 RRATS J1336+33，J1404+11，J1848+15，J2051+12，J2105+22的脉冲的数量和振幅在六到二十个月内从六到二十个月变化。发现RRATS J0139+33和J0302+22的长期趋势，显示在1,959天内检测到的脉搏数增加了2-3倍。一些RRAT显示脉冲数和脉冲幅度的年变化。很难通过星际介质上的折射闪烁来解释所有这些变化时间尺度。年度和半年度变化很可能是由于无均匀行星际等离子体的闪烁引起的。我们的数据表明，在阈值上无脉冲检测的观察性会话的数量随脉冲静音的长度而呈指数减少。
Pulses from 16 previously known rotating radio transients (RRAT) have been searched at the 110 MHz daily monitor program for 4 to 5.5 years by using the Large-Phased-Array (LPA) at Pushchino. The total number of pulses detected in such a long observation interval is only 90 pulses for RRAT J0640+07 or is as high as 10,751 pulses for RRAT J0302+22. The number and amplitude of pulses varies at a time-scales from six to twenty months for RRATs J1336+33, J1404+11, J1848+15, J2051+12, J2105+22, and the pulse number can increase by one or two orders of magnitude in active phases. The long-term trends are found for RRATs J0139+33 and J0302+22, showing a 2-3 times increase in detected pulse number over 1,959 days. Some RRATs show the annual variations on both pulse number and pulse amplitude. It is hard to explain all these variation time scales by refractive scintillation on the interstellar medium. The annual and semi-annual variations are likely caused by scintillations of the inhomogeneous interplanetary plasma. Our data show that the number of observational sessions with no pulse detection over the threshold decreases exponentially with the length of pulse silence.
