论文标题
限制从宿主星系特性的二进制中子星合并的延迟时间分布
Constraining Delay Time Distribution of Binary Neutron Star Mergers from Host Galaxy Properties
论文作者
论文摘要
引力波（GW）观测值正在发现二进制中子星星合并（BNSM），在至少一个事件中，我们能够在多个光波长中追踪它，这使我们能够识别宿主星系。使用具有推断的恒星形成历史的局部星系目录并采用BNSM延迟时间分布（DTD）模型，我们研究了BNSM速率对一系列星系性能的依赖性。与星系的内在性质分布相比，BNSM宿主星系的偏向于具有红色的星系，较低的特异性恒星形成速率，较高的亮度和较高的恒星质量，反映了更大质量星系中BNSM较高速率的趋势。我们引入了形式主义，以有效地预测使用主机星系属性来限制DTD模型。我们发现，从BNSM发生分布对星系颜色，特定的恒星形成率和出色质量的依赖性中的限制比依赖于$ r $ band亮度的质量要好。最严格的约束来自使用宿主星系的单个恒星形成历史，这使DTD参数的不确定性减少了三倍或更多。大约10个BNSM检测可以区分基本不同的DTD模型。要以10 \％的精度限制DTD参数需要大约一百个检测，可以在十年时间范围内使用GW观测来实现。
Gravitational wave (GW) observatories are discovering binary neutron star mergers (BNSMs), and in at least one event we were able to track it down in multiple wavelengths of light, which allowed us to identify the host galaxy. Using a catalogue of local galaxies with inferred star formation histories and adopting a BNSM delay time distribution (DTD) model, we investigate the dependence of BNSM rate on an array of galaxy properties. Compared to the intrinsic property distribution of galaxies, that of BNSM host galaxies is skewed toward galaxies with redder colour, lower specific star formation rate, higher luminosity, and higher stellar mass, reflecting the tendency of higher BNSM rates in more massive galaxies. We introduce a formalism to efficiently make forecast on using host galaxy properties to constrain DTD models. We find comparable constraints from the dependence of BNSM occurrence distribution on galaxy colour, specific star formation rate, and stellar mass, all better than those from dependence on $r$-band luminosity. The tightest constraints come from using individual star formation histories of host galaxies, which reduces the uncertainties on DTD parameters by a factor of three or more. Substantially different DTD models can be differentiated with about 10 BNSM detections. To constrain DTD parameters at 10\% precision level requires about one hundred detections, achievable with GW observations on a decade time scale.
