论文标题
来自多个不同观察结果的Bray保守踢型踢脚踢的新约束
New constraints on the Bray conservation-of-momentum natal kick model from multiple distinct observations
论文作者
论文摘要
纳塔尔超新星踢是线性动量紧凑型在形成过程中收到的，是二元种群合成（BPS）模型的重要组成部分。尽管这些踢是有证据支持的，但它们的基本分布并将其纳入BPS模型尚不确定。在这项工作中，我们使用先前提出的分析处方研究出生踢的性质，其中踢球的强度由$ v_ \ text {k} =α\ frac {m_ \ frac {m_ \ frac {m_ \ text {eignta}} {m__ \ text {m_ \ text {remnant}}}}}}}+β〜 \ text+β〜 $β$。我们在可能值的较大范围内改变了自由参数，同时比较了这些综合种群与四个约束：紧凑型二元中性星（BNS）系统的合并速率，银河系BNS的周期分类分布，单星脉冲的速度分布，单星脉冲的速度和低欧斯特群落的可能性较低的exteceagea群体，以使低 - extea s supernovaea s supernovaivae supernovaivaive supernovaivaive supernovaive s supernovaivaive。我们发现参数空间的不同样本满足每个测试，只有1％同时满足所有四个约束。 Although we cannot identify a single best kick model, we report $α=115^{+40}_{-55}~\text{km s}^{-1}, β=15^{+10}_{-15}~\text{km s}^{-1}$ as the center of the region of the parameter space that fulfils all of our constraints, and expect $β\ geq0〜 \ text {km s}^{ - 1} $作为进一步的约束。我们还建议进一步的观察结果，以使踢脚模型的未来改进。对踢的敏感测试将是BNS合并率的红移演变，因为这实际上是对合并的延迟时间分布的直接度量。对于我们的最佳拟合值，我们发现BNS合并率的峰值是当今。
Natal supernova kicks, the linear momentum compact remnants receive during their formation, are an essential part of binary population synthesis (BPS) models. Although these kicks are well-supported by evidence, their underlying distributions and incorporation into BPS models is uncertain. In this work, we investigate the nature of natal kicks using a previously proposed analytical prescription where the strength of the kick is given by $v_\text{k}=α\frac{m_\text{ejecta}}{m_\text{remnant}}+β~\text{km s}^{-1}$, for free parameters $α$ and $β$. We vary the free parameters over large ranges of possible values, comparing these synthetic populations simultaneously against four constraints: the merger rate of compact binary neutron star (BNS) systems, the period-eccentricity distribution of galactic BNSs, the velocity distribution of single-star pulsars, and the likelihood for low-ejecta mass supernovae to produce low-velocity kicks. We find that different samples of the parameter space satisfy each tests, and only 1 per cent of the models satisfy all four constraints simultaneously. Although we cannot identify a single best kick model, we report $α=115^{+40}_{-55}~\text{km s}^{-1}, β=15^{+10}_{-15}~\text{km s}^{-1}$ as the center of the region of the parameter space that fulfils all of our constraints, and expect $β\geq0~\text{km s}^{-1}$ as a further constraint. We also suggest further observations that will enable future refinement of the kick model. A sensitive test for the kick model will be the redshift evolution of the BNS merger rate since this is effectively a direct measure of the delay-time distribution for mergers. For our best fitting values, we find that the peak of the BNS merger rate is the present-day.
