标题： 毫秒X射线脉冲星的人口合成 显示英文标题

标题： Population Synthesis of Millisecond X-ray Pulsars

摘要： 作为射电毫秒脉冲星(MSPs)与低质量X射线双星或中等质量X射线双星之间的进化联系，毫秒X射线脉冲星(MSXPs)是在测试脉冲星形成和演化理论的重要对象。 一般来说，MSXPs中的中子星可以通过大质量恒星的核心坍缩超新星(CC通道)或吸积的ONeMg白矮星质量达到钱德拉塞卡极限时的吸积诱导坍缩(AIC通道)形成。 在这里，除了CC和AIC通道外，我们还考虑了另一个通道，即质量在$1.4$和$2.5 M_{\odot}$之间的氦星的演化诱导坍缩(EIC通道)。 使用一个群体合成代码，我们研究了来自三种不同演化通道的MSXPs。 我们发现瞬态MSXPs和持续MSXPs的银河系诞生率约为0.7---$1.4\times 10^{-4}$年$^{-1}$。 我们的群体合成计算表明，大约50%---90%的MSXPs经历了CC通道，约10%---40%的MSXPs经历了EIC通道，而通过AIC通道的MSXPs最少。 显示英文摘要

摘要： As the evolutionary link between the radio millisecond pulsars (MSPs) and the low mass X-ray binaries or intermediate mass X-ray binaries, the millisecond X-ray pulsars (MSXPs) are important objects in testing theories of pulsar formation and evolution. In general, neutron stars in MSXPs can form via core collapse supernova (CC channel) of massive stars or accretion induced collapse (AIC channel) of an accreting ONeMg WD whose mass reaches the Chandrasekhar limit. Here, in addition to CC and AIC channels we also consider another channel, i.e., evolution induced collapse (EIC channel) of a helium star with mass between $1.4$ and $2.5 M_{\odot}$. Using a population synthesis code, we have studied MSXPs arising from three different evolutionary channels. We find that the Galactic birthrates of transient MSXPs and persistent MSXPs are about 0.7---$1.4\times 10^{-4}$ yr$^{-1}$. Our population synthesis calculations have shown that about 50\%---90\% of the MSXPs have undergone CC channel, about 10\%---40\% of them have undergone EIC channel, and the MSXPs via AIC channel are the least.