论文标题
小麦哲伦云的无线电脉冲星人口
The radio pulsar population of the Small Magellanic Cloud
论文作者
论文摘要
我们今天对小麦哲伦云(SMC)的可观察到的正常无线电脉冲星人群进行建模。脉冲星是由SEBA生成的,SEBA是一种二元人口综合代码,它会演变出二进制文件,而成分恒星物体则呈现为残余形成及以后。我们通过选择满足银河脉冲星定义的一系列标准的中子星来定义无线电脉冲星,并应用了以前和将来的SMC脉冲星监测的检测阈值。合成和恢复的脉冲星数的数量异常敏感,对假定的恒星形成历史和应用的广泛启动,但对基于型号的广泛启动,是对基础的广泛启动,是基于基础的启动,是基于基础的启示,并依赖于基础启动,并依次敏感速度分布。我们估计SMC形成(1.6 $ \ pm $ 0.3)$ \ times 10^4 $ pulsars在最后100个MYRS中。我们研究了SMC的Parkes Multibeam调查,通过应用调查的特定选择效果可以观察到哪些脉冲星,并恢复4.0 $ \ pm $ 0.8合成脉冲星。这与他们的五个观察到的脉冲星是一致的。我们还为即将进行的SMC调查应用了建议的Meerkat配置,并预测Meerkat调查将检测到17.2 $ \ pm $ 2.5脉冲星。
We model the present day, observable, normal radio pulsar population of the Small Magellanic Cloud (SMC). The pulsars are generated with SeBa, a binary population synthesis code that evolves binaries and the constituent stellar objects up to remnant formation and beyond. We define radio pulsars by selecting neutron stars that satisfy a selection of criteria defined by Galactic pulsars, and apply the detection thresholds of previous and future SMC pulsar surveys.The number of synthesised and recovered pulsars are exceptionally sensitive to the assumed star formation history and applied radio luminosity model, but is not affected extensively by the assumed common envelope model, metallicity, and neutron star kick velocity distribution. We estimate that the SMC formed (1.6$\pm$0.3)$\times 10^4$ normal pulsars during the last 100 Myrs. We study which pulsars could have been observed by the Parkes multibeam survey of the SMC, by applying the survey's specific selection effects, and recover 4.0$\pm$0.8 synthetic pulsars.This is in agreement with their five observed pulsars. We also apply a proposed MeerKAT configuration for the upcoming SMC survey, and predict that the MeerKAT survey will detect 17.2$\pm$2.5 pulsars.