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 1606.07096astro-ph.HE
收藏

X射线脉冲星M82 X-2的螺旋桨线

The X-ray Pulsar M82 X-2 on its Propeller Line

D. M. Christodoulou, D. Kazanas, S. G. T. Laycock

摘要:

{ \it NuSTAR}探测到了来自M82中的超亮X射线源X-2的脉动,而{ \it Chandra}的存档观测也让我们对它的占空比有了一个很好的了解。这颗新发现的脉冲星在过去的15年里至少出现了4次超级爱丁顿爆发,但在最低功率状态下,它的辐射略低于爱丁顿极限,其性质似乎是典型的高质量X射线双星。M82 X-2被描述为一颗普通的中子星,其磁场为1~TG,偶尔会在爱丁顿速率以上吸积,而M82 X-2则被描述为一颗类磁星脉冲星,其磁场为10-100~TG,达到量子极限以上。我们支持前一种解释。利用标准吸积理论和现有的观测资料,我们用两种独立的方法计算了这颗脉冲星的恒星磁场,结果表明,在任何一种情况下,恒星磁场都不会超过3~TG。我们讨论了我们的研究结果的影响,偶尔表现出类似的强大爆发的其他超铝X射线源。

英文摘要:

{\it NuSTAR} has detected pulsations from the ultraluminous X-ray source X-2 in M82 and archival {\it Chandra} observations have given us a good idea of its duty cycle. The newly discovered pulsar exhibited at least 4 super-Eddington outbursts in the past 15 years but, in its lowest-power state, it radiates just below the Eddington limit and its properties appear to be typical of high-mass X-ray binaries. M82 X-2 has been described as a common neutron star with a 1~TG magnetic field that occasionally accretes above the Eddington rate and as a magnetar-like pulsar with a 10-100~TG magnetic field that reaches above the quantum limit. We argue in favor of the former interpretation. Using standard accretion theory and the available observations, we calculate the stellar magnetic field of this pulsar in two independent ways and we show that it cannot exceed 3~TG in either case. We discuss the implications of our results for other ultraluminous X-ray sources that occasionally exhibit similar powerful outbursts.

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。

↑