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arXiv 2003.14347astro-ph.HE
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在X射线脉冲星GX 301 $-$ 2中发现逆行旋转中子星

Discovery of a retrogradely rotating neutron star in the X-ray pulsar GX 301$-$2

Juhani Mönkkönen, Victor Doroshenko, Sergey S. Tsygankov, Armin Nabizadeh, Pavel Abolmasov, Juri Poutanen

摘要:

利用Fermi/GBM对慢X射线脉冲星GX 301 $-$ 2的长期观测,分析了其自旋沿轨道的演化。基于观测证实的吸积方案和角动量吸积的分析模型,我们证明了在这个系统中,中子星的自旋逆行,即在相反的方向上的轨道运动。这一首次发现证明了在适当的吸积力矩下,吸积系统中逆行旋转的主要可能性,并可能对我们理解X射线星体的自旋演化、估计其初始自旋周期以及演化的最终结果产生深远的影响。

英文摘要:

We report on the analysis of the spin evolution of a slow X-ray pulsar GX 301$-$2 along the orbit using long-term monitoring by Fermi/GBM. Based on the observationally confirmed accretion scenario and an analytical model for the accretion of angular momentum we demonstrate that in this system, the neutron star spins retrogradely, that is, in a direction opposite to the orbital motion. This first-of-a-kind discovery of such a system proves the principal possibility of retrograde rotation in accreting systems with suitable accretion torque, and might have profound consequences for our understanding of the spin evolution of X-ray pulsars, estimates of their initial spin periods, and the ultimate result of their evolution.

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。

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