arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.6079astro-ph.HEastro-ph.GA
收藏

作为超亮X射线源的年轻旋转驱动的双光子晶体

Young rotation-powered pulsars as ultra-luminous X-ray sources

Aleksei S. Medvedev, Juri Poutanen

摘要:

本论文的目的是研究旋转动力的脉冲星和脉冲星风星云对超亮X射线源(ULX)的可能贡献。首先,我们开发了一个分析模型的分布函数的演化的自旋周期和发现的稳态和时间依赖的解决方案。利用脉冲星特征年龄与X射线效率关系的最新结果,计算了旋转供电脉冲星的X射线光度函数。在一般情况下,它具有高光度截止的破幂律形状,这取决于出生自旋周期和磁场的分布。利用观测到的附近星系源的XLF和脉冲星XLF不超过的条件,我们找到了描述出生周期分布的参数的允许区域。我们发现脉冲星的平均周期应大于10-40 ms,这与核塌缩超新星的X射线光度所得到的限制是一致的。我们估计,旋转动力的恒星对ULX星群的贡献超过3%。对于一个宽的出生期分布,这一比例随着光度的增长而增长,10 E40 erg/s以上的恒星可以主导ULX星群。

英文摘要:

The aim of the present paper is to investigate a possible contribution of the rotation-powered pulsars and pulsar wind nebulae to the population of ultraluminous X-ray sources (ULXs). We first develop an analytical model for the evolution of the distribution function of pulsars over the spin period and find both the steady-state and the time-dependent solutions. Using the recent results on the X-ray efficiency dependence on pulsar characteristic age, we then compute the X-ray luminosity function (XLF) of rotation-powered pulsars. In a general case it has a broken power-law shape with a high luminosity cutoff, which depends on the distributions of the birth spin period and the magnetic field. Using the observed XLF of sources in the nearby galaxies and the condition that the pulsar XLF does not exceed that, we find the allowed region for the parameters describing the birth period distribution. We find that the mean pulsar period should be greater than 10-40 ms. These results are consistent with the constraints obtained from the X-ray luminosity of core-collapse supernovae. We estimate that the contribution of the rotation-powered pulsars to the ULX population is at a level exceeding 3 per cent. For a wide birth period distribution, this fraction grows with luminosity and above 10E40 erg/s pulsars can dominate the ULX population.

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。

↑