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arXiv 2203.09423astro-ph.HE
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gamma-ray双星LS I +61 $^{\circ}$ 303中中子星的射电脉动

Radio pulsations from a neutron star within the gamma-ray binary LS I +61$^{\circ}$ 303

Shan-Shan Weng, Lei Qian, Bo-Jun Wang, D. F. Torres, A. Papitto, Peng Jiang, Renxin Xu, Jian Li, Jing-Zhi Yan, Qing-Zhong Liu, Ming-Yu Ge, Qi-Rong Yuan

摘要:

LS I +61 $^{\circ}$ 303是罕见的伽马射线双星之一,其大部分亮度都是能量超过100 MeV的光子。$\sim$ 26.5 d的轨道周期在许多波长下都能清楚地探测到。其多频率行为的其他方面使其成为该类中最有趣的示例。高分辨率射电图像的形态随着轨道相位的变化而变化,显示出一个指向远离大质量恒星的彗星尾巴。LS I +61 $^{\circ}$ 303也显示出超轨道可变性。几个高能的($\sim 10^{37}$ erg的$^{-1}$),短的,类似磁星的爆发已经被合理地归因于它。LS I +61 $^{\circ}$ 303的现象学已经在理论上仔细研究了几十年,但是缺乏确定性的性质,在双星中的紧凑对象阻止了我们对源的理解。在这里,使用500米口径球面射电望远镜(FAST)进行的观测,我们报告了来自LS I +61 $^{\circ}$ 303方向的瞬态射电脉动的存在。我们发现一个周期$P=269.15508 \pm 0.00016$ ms在$> 20σ$的意义。这是第一个在任何频率下都有来自这个源的脉动的证据,并且强烈地论证了在LS I +61 $^{\circ}$ 303中存在旋转的中子星。

英文摘要:

LS I +61$^{\circ}$ 303 is one of the rare gamma-ray binaries, emitting most of their luminosity in photons with energies beyond 100 MeV. The $\sim$26.5 d orbital period is clearly detected at many wavelengths. Additional aspects of its multi-frequency behavior make it the most interesting example of the class. The morphology of high-resolution radio images changes with orbital phase displaying a cometary tail pointing away from the high-mass star. LS I +61$^{\circ}$ 303 also shows superorbital variability. A couple of energetic ($\sim 10^{37}$ erg s$^{-1}$), short, magnetar-like bursts have been plausibly ascribed to it. LS I +61$^{\circ}$ 303's phenomenology has been put under theoretical scrutiny for decades, but the lack of certainty regarding the nature of the compact object in the binary has prevented advancing our understanding of the source. Here, using observations done with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we report on the existence of transient radio pulsations from the direction of LS I +61$^{\circ}$ 303. We find a period $P=269.15508 \pm 0.00016$ ms at a significance of $> 20σ$. This is the first evidence for pulsations from this source at any frequency, and strongly argues for the existence of a rotating neutron star in LS I +61$^{\circ}$ 303.

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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