arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0708.3566astro-ph
收藏

亚毫秒脉冲星XTE J1739-285是否包含低磁中子星或夸克星?

Does Sub-millisecond Pulsar XTE J1739-285 Contain a Low Magnetic Neutron Star or Quark Star ?

C. M. Zhang, H. X. Yin, Y. H. Zhao, Y. C. Wei, X. D. Li

摘要:

随着可能探测到旋转速度最快的核动力脉冲星XTE J1739-285,频率为1122 Hz(0.8913 ms),它引起了我们对其中心致密物体的质量和半径的限制,并暗示恒星的物质组成:中子或夸克。被吸积物质旋转到如此高的旋转速度,致密恒星应该有一个小半径或短的最内层稳定圆形轨道。根据上kHz准周期振荡频率与恒星自旋频率之间的经验关系,得到了质量和半径的强约束为1.51太阳质量和10.9 km,排除了大多数正常中子的状态方程,强烈暗示该恒星可能是一颗奇异夸克星.此外,还估算了恒星磁场约为$4\times10^{7} (G) < B < 10^{9} (G) $,与毫秒射电天体的磁场一致,揭示了两类天体演化联系的线索。

英文摘要:

With the possible detection of the fastest spinning nuclear-powered pulsar XTE J1739-285 of frequency 1122 Hz (0.8913 ms), it arouses us to constrain the mass and radius of its central compact object and to imply the stellar matter compositions: neutrons or quarks. Spun-up by the accreting materials to such a high rotating speed, the compact star should have either a small radius or short innermost stable circular orbit. By the empirical relation between the upper kHz quasi-periodic oscillation frequency and star spin frequency, a strong constraint on mass and radius is obtained as 1.51 solar masses and 10.9 km, which excludes most equations of states (EOSs) of normal neutrons and strongly hints the star promisingly to be a strange quark star. Furthermore, the star magnetic field is estimated to be about $4\times10^{7} (G) < B < 10^{9} (G) $, which reconciles with those of millisecond radio pulsars, revealing the clues of the evolution linkage of two types of astrophysical objects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑