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arXiv 2102.00045astro-ph.HE
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零脉冲星星族的统计分析

A Statistical Analysis of the Nulling Pulsar Population

Sofia Z. Sheikh, Mariah G. MacDonald

摘要:

大约8%的$\sim$ 2800已知的脉冲星表现出“零”,一种正常脉冲星发射的暂时宽带停止。零化行为可以通过零化分数粗略地量化,零化分数描述了给定脉冲星将被发现处于零状态的时间百分比。在本文中,我们进行了最彻底的统计分析,迄今为止的141个已知的归零器的属性。我们发现零化分数和脉冲宽度,以及零化分数和自旋周期,这可能是由于选择效应之间的弱,非线性相关性。我们还进一步调查了最近假设的差距在40%零分数。虽然局部最小值确实存在于分布中,但当我们使用单变量和多变量聚类方法进行调查时,我们无法确认分布中的一致性和唯一性,也无法证明关于此最小值存在两个统计学上不同的群体。使用相同的方法,我们发现,零的卫星是一个统计上不同的人口从正常的,无线电,非零的卫星,这从来没有被定量验证。此外,我们总结了先前的零脉冲星统计文献,这是出了名的矛盾的结果。这项研究,在上下文中,进一步的想法,零分数本身不包含足够的信息来描述的零脉冲星的行为和其他参数,如零长度和零随机性,除了更好地了解选择效应,需要充分理解这种现象。

英文摘要:

Approximately 8% of the $\sim$2800 known pulsars exhibit "nulling," a temporary broadband cessation of normal pulsar emission. Nulling behaviour can be coarsely quantified by the nulling fraction, which describes the percentage of time a given pulsar will be found in a null state. In this paper, we perform the most thorough statistical analysis thus far of the properties of 141 known nulling pulsars. We find weak, non-linear correlations between nulling fraction and pulse width, as well as nulling fraction and spin period which could be attributed to selection effects. We also further investigate a recently-hypothesized gap at 40% nulling fraction. While a local minimum does exist in the distribution, we cannot confirm a consistent and unique break in the distribution when we investigate with univariate and multivariate clustering methods, nor can we prove the existence of two statistically distinct populations about this minimum. Using the same methods, we find that nulling pulsars are a statistically different population from normal, radio, non-nulling pulsars, which has never been quantitatively verified. In addition, we summarize the findings of the prior nulling pulsar statistics literature, which are notoriously contradictory. This study, in context, furthers the idea that nulling fraction alone does not contain enough information to describe the behaviour of a nulling pulsar and that other parameters such as null lengths and null randomness, in addition to a better understanding of selection effects, are required to fully understand this phenomenon.

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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