重新讨论低质量X射线二毫秒射电脉冲星出生率问题
The low-mass X-ray binary-millisecond radio pulsar birthrate problem revisited
摘要:
本文研究了低质量X射线双星和毫秒射电双星的诞生率问题。我们考虑中等质量和低质量的X射线双星(I/LMXB)作为MRPs的祖先,并计算它们的演化对宇宙恒星形成率(SFR)的半解析和数值响应。根据LMXB寿命的典型值(~1 Gyr),人们可以预期LMXB和MRP的出生率相当,但计算出的LMXB数量比银河系中观测到的要高一个数量级。相反,我们认为,出生率问题可以得到解决,如果大多数MRP已经从微弱而明亮的LMXB演变而来。前者在银河系中可能有约104个人口。
英文摘要:
We investigate the birthrate problem for low-mass X-ray binaries (LMXBs) and millisecond radio pulsars (MRPs) in this paper. We consider intermediate-mass and low-mss X-ray binaries (I/LMXBs) as the progenitors of MRPs, and calculate their evolutionary response to the cosmic star formation rate (SFR) both semi-analytically and numerically. With typical value (~1 Gyr) of the LMXB lifetime, one may expect comparable birthrates of LMXBs and MRPs, but the calculated number of LMXBs is an order of magnitude higher than observed in the Galaxy. Instead, we suggest that the birthrate problem could be solved if most MRPs have evolved from faint rather bright LMXBs. The former may have a population of ~ 104 in the Galaxy.
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