论文标题
银河模型不确定性对双中性星星的丽莎观测的影响
The effects of Galactic model uncertainties on LISA observations of double neutron stars
论文作者
论文摘要
使用即将到来的空间引力波观测站丽莎（Lisa）对含有中子恒星对的二进制物的观察有可能提高我们对中子恒星物理学和二元进化的理解。在这项工作中，我们评估了改变银河系的运动学和恒星形成历史模型对将被丽莎检测和解决的双中性恒星人口的预测。我们得出的结论是，与小样本量引起的随机变化相比，这些二进制文件的空间分布对银河系模型的选择不敏感。特别是，不需要对二进制的银河轨道进行耗时的计算。然而，偏心率和重力波频率的分布受到恒星形成历史的选择影响。具有偏心率E> 0.1的二进制物可以通过LISA观测来测量，大多数小于100 MYR。我们警告说，比较丽莎观测的不同预测之间需要使用一致的恒星形成历史，并且在分析观测本身的分析中应考虑银河恒星形成历史。缺乏对银河系模型的强烈依赖意味着丽莎对双中性恒星二进制的检测可能会提供相对干净的大规模二进制恒星进化的探针。
Observations of binaries containing pairs of neutron stars using the upcoming space-based gravitational wave observatory, LISA, have the potential to improve our understanding of neutron star physics and binary evolution. In this work we assess the effect of changing the model of the Milky Way's kinematics and star formation history on predictions of the population of double neutron stars that will be detected and resolved by LISA. We conclude that the spatial distribution of these binaries is insensitive to the choice of galactic models, compared to the stochastic variation induced by the small sample size. In particular, the time-consuming computation of the binaries' Galactic orbits is not necessary. The distributions of eccentricity and gravitational-wave frequency are, however, affected by the choice of star-formation history. Binaries with eccentricities e>0.1, which can be measured by LISA observations, are mostly younger than 100 Myr. We caution that comparisons between different predictions for LISA observations need to use consistent star formation histories, and that the Galactic star formation history should be taken into account in the analysis of the observations themselves. The lack of strong dependency on Galactic models means that LISA detection of double neutron star binaries may provide a relatively clean probe of massive binary star evolution.
