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arXiv 2409.12271astro-ph.HEastro-ph.COhep-ph
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关于毫秒脉冲星产生的银河系中心伽马射线信号的引力波对应体

On the Gravitational Wave Counterpart to a Gamma-ray Galactic Center Signal from Millisecond Pulsars

Kayla Bartel, Stefano Profumo

AI总结:

该研究模拟可解释银河系中心伽马射线超量的毫秒脉冲星种群,并预测其准单色引力波对应体的频率与应变,以区分脉冲星和暗物质起源。

摘要:

引力波与多信使天文学的新工具使人们能够以新的方式研究天体物理现象,并有助于揭示高能天体物理学中一些最持久的谜团。其中之一便是银河系中心伽马射线超量,其相关源的本质可能是正在湮灭的暗物质,也可能是一批尚未分辨的毫秒脉冲星(MSPs)。MSPs 很可能相对于其自转轴不对称,因此被认为还会产生准单色引力波,而暗物质过程不会发射这种引力波。我们利用统计方法模拟了具有不同形态和转动惯量、且可能导致该伽马射线超量的真实 MSP 种群样本,并计算了相应的引力波信号振幅和频率。我们发现,引力波信号频率很可能介于约 200 至 1400 Hz 之间,而来自银河系中心的集体无量纲应变振幅介于 10^-26 至 10^-24 之间;因此,除非这些未分辨的 MSPs 在伽马射线波段异常暗淡,否则该信号极有可能超出当前及近期探测器的能力范围。

英文摘要:

The new tools of gravitational wave and multi-messenger astronomy allow for the study of astrophysical phenomenon in new ways and enables light to be shed on some of the longest-enduring mysteries of high-energy astrophysics. Among the latter stands the Galactic center gamma-ray excess, associated with a source whose nature could be annihilating dark matter or a yet-unresolved population of millisecond pulsars (MSPs). MSPs are most likely asymmetric about their axis of rotation, and are thus thought to also source quasi-monochromatic gravitational waves, that dark matter processes would not emit. Using statistical methods, we simulate realistic MSP population samples with differing morphology and moment of inertia, that could give rise to the gamma-ray excess, and we compute the corresponding gravitational wave signal amplitude and frequency. We find that the gravitational wave signal frequency likely ranges between $\sim$200 and 1400 Hz, and that the collective dimensionless strain from the center of the Galaxy has an amplitude between $10^{-26}$ and $10^{-24}$, thus most likely beyond current and near-term detectors, unless the unresolved MSPs are extraordinarily gamma-ray dim.

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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