论文标题
在银河系脉冲星的无线电光谱上
On the radio spectra of Galactic millisecond pulsars
论文作者
论文摘要
随着银河磁盘无线电调查的敏感性的最新进展，近年来毫秒脉冲星（MSP）的数量已大大增加，因此现在可以比过去更详细地研究其人口特性。我们研究了有关MSP人群无线电光谱的知识。使用在0.135-6.6 GHz范围内的无线电频率下进行的11个调查中检测到的179个MSP的样品，我们对此范围内MSP无线电频谱行为进行了详细的建模。我们采用马尔可夫链蒙特卡洛模拟来探索多维参数空间，并准确地考虑观察性选择效果，我们找到了有力的证据，有利于具有频率为$ν$的两个组件幂律频谱模型缩放的MSP人群。具体而言，我们发现MSP通量密度光谱大致与低于320 MHz的频率独立于频率，并且在较高的频率下与$ν^{ - 1.5} $成正比。该参数化的性能明显优于单个幂律模型，后者预测低频（100-200 MHz）监测中的MSP数量。我们将我们的结果与较早的工作以及对正常脉冲星人群的当前理解进行了比较，并使用我们的模型对即将进行的调查中的MSP产量进行预测。我们证明，在未来十年中，观察到的MSP样本可以三倍。
With recent advances in the sensitivity of radio surveys of the Galactic disk, the number of millisecond pulsars (MSPs) has increased substantially in recent years such that it is now possible to study their demographic properties in more detail than in the past. We investigate what can be learned about the radio spectra of the MSP population. Using a sample of 179 MSPs detected in eleven surveys carried out at radio frequencies in the range 0.135-6.6 GHz, we carry out detailed modeling of MSP radio spectral behaviour in this range. Employing Markov Chain Monte Carlo simulations to explore a multi-dimensional parameter space, and accurately accounting for observational selection effects, we find strong evidence in favour of the MSP population having a two-component power-law spectral model scaling with frequency, $ν$. Specifically, we find that MSP flux density spectra are approximately independent of frequency below 320 MHz, and proportional to $ν^{-1.5}$ at higher frequencies. This parameterization performs significantly better than single power-law models which over predict the number of MSPs seen in low-frequency (100-200 MHz) surveys. We compared our results with earlier work, and current understanding of the normal pulsar population, and use our model to make predictions for MSP yields in upcoming surveys. We demonstrate that the observed sample of MSPs could triple in the coming decade.
