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arXiv 2011.03773astro-ph.HE
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潮汐扰动事件AT2019dsg驱动的离轴喷流的中微子发射

Neutrino Emission from an Off-Axis Jet Driven by the Tidal Disruption Event AT2019dsg

Ruo-Yu Liu, Shao-Qiang Xi, Xiang-Yu Wang

摘要:

最近,一个高能量的μ子中微子事件被检测到与潮汐破坏事件(TDE)AT 2019 dsg在光学/紫外光度峰值后约150天的时间。我们提出,如果我们以中等角度观察喷流(即,大约10-30度)。这种离轴视角导致视线中的高气柱密度,从而为光电离和贝特-海特勒过程提供高不透明度,{并允许存在相对较高的固有长期X射线辐射发射率}。因此,伴随中微子产生的级联发射,否则会超过X射线和/或GeV波段的通量限制,被显着模糊或吸收。由于TDE的喷流被假定为在天空中随机取向,因此具有离轴喷流的TDE的源密度率显著高于具有轴上喷流的TDE。因此,离轴喷流是自然预期在附近的TDE被发现,支持所提出的方案。

英文摘要:

Recently, a high-energy muon neutrino event was detected in association with a tidal disruption event (TDE) AT2019dsg at the time about 150 days after the peak of the optical/UV luminosity. We propose that such a association could be interpreted as arising from hadronic interactions between relativistic protons accelerated in the jet launched from the TDE and the intense radiation field of TDE inside the optical/UV photosphere, if we are observing the jet at a moderate angle (i.e., approximately 10-30 degree) with respect to the jet axis. Such an off-axis viewing angle leads to a high gas column density in the line of sight which provides a high opacity for the photoionization and the Bethe-Heitler process, {and allows the existence of an intrinsic long-term X-ray radiation of comparatively high emissivity}. As a result, the cascade emission accompanying the neutrino production, which would otherwise overshoot the flux limits in X-ray and/or GeV band, is significantly obscured or absorbed. Since the jets of TDEs are supposed to be randomly oriented in the sky, the source density rate of TDE with an off-axis jet is significantly higher than that of TDE with an on-axis jet. Therefore, an off-axis jet is naturally expected in a nearby TDE being discovered, supporting the proposed scenario.

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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