论文标题
部分可观测时空混沌系统的无模型预测
The LOFAR Tied-Array All-Sky Survey: Timing of 35 radio pulsars and an overview of the properties of the LOFAR pulsar discoveries
论文作者
论文摘要
迄今为止，Lofar绑定的All-Sky调查（Lotaas）是迄今为止以低无线电频率（119---151 \，MHz）进行的最敏感的无靶向无线电调查，并且已经发现了76个新的无线电脉冲星，其中23.5-SPULSAR J0250+5854，直到最近，直到最近的慢速无线电刺激了PULSAR，是Slosts-Spinning spinning ningning spinning ningning spinning ningning spinning ningning spinning nisting spinnings nownning ningning ningning ningning ningning ningning ningning ningning ningning ningning ningning ningning ningning ningning ningning。在这里，我们报告了Lotaas发现的35个脉冲星的定时解决方案，其中包括无效的脉冲星和轻度回收的脉冲星，从而完成了对Lotaas Pulsar发现的完整时机分析。我们概述了76个脉冲星的完整莲花样本中的发现，讨论了它们的脉冲曲线，无线电光谱和时序参数。我们发现，某些脉冲星的脉冲轮廓在时间或频率上显示出曲线的变化，而某些脉冲星则显示出散射的迹象，但绝大多数显示没有脉冲拓宽。与已知的PULSAR人群相比，Lotaas的发现平均具有更陡峭的无线电光谱，并且具有更长的旋转期（$ 1.4 \ times $）以及更低的旋转率（$ 3.1 \ times $）。我们讨论了这些差异的原因，并将它们归因于Lotaas调查的选择效应以及以前的PULSAR调查的组合，尽管不能排除较老的Pulsars倾向于具有更陡峭的无线电光谱。
The LOFAR Tied-Array All-Sky Survey (LOTAAS) is the most sensitive untargeted radio pulsar survey performed at low radio frequencies (119--151\,MHz) to date and has discovered 76 new radio pulsars, among which the 23.5-s pulsar J0250+5854, up until recently the slowest-spinning radio pulsar known. Here, we report on the timing solutions of 35 pulsars discovered by LOTAAS, which include a nulling pulsar and a mildly recycled pulsar, and thereby complete the full timing analysis of the LOTAAS pulsar discoveries. We give an overview of the findings from the full LOTAAS sample of 76 pulsars, discussing their pulse profiles, radio spectra and timing parameters. We found that the pulse profiles of some of the pulsars show profile variations in time or frequency and while some pulsars show signs of scattering, a large majority display no pulse broadening. The LOTAAS discoveries have on average steeper radio spectra and have longer spin periods ($1.4\times$) as well as lower spin-down rates ($3.1\times$) compared to the known pulsar population. We discuss the cause of these differences, and attribute them to a combination of selection effects of the LOTAAS survey as well as previous pulsar surveys, though can not rule out that older pulsars tend to have steeper radio spectra.
