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arXiv 1406.2160astro-ph.HEhep-exhep-ph
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根据最近的IceCube观测确定河外中微子源

Pinpointing Extragalactic Neutrino Sources in Light of Recent IceCube Observations

Markus Ahlers, Francis Halzen

摘要:

冰立方合作组织最近报告了对高能天体物理中微子流的观测。事件的角分布是一致的各向同性的中微子,这是预期的河外起源的到达方向。我们估计在冰立方观测水平上从许多河外源的准扩散叠加中检测单个中微子源的前景。我们的分析考虑了源分布的集合变化以及单个源的事件统计。我们通过对多重谱线的观测,证明了冰立方在其目前的配置下,在运行的5年内,对罕见的< 10^-8 Mpc^-3 yr^-1瞬变源类是敏感的。由于背景较大,识别与时间无关的源更具挑战性。我们估计,在同一时期,冰立方对密度小于10^-6 Mpc^-3的稀疏源很敏感,这是通过将事件与一个集合中最近的100个源联系起来实现的。我们表明,下一代中微子天文台的5倍的冰立方和其他类似的检测器性能的有效面积将增加约两个数量级的源密度和速率的灵敏度。

英文摘要:

The IceCube Collaboration has recently reported the observation of a flux of high-energy astrophysical neutrinos. The angular distribution of events is consistent with an isotropic arrival direction of neutrinos which is expected for an extragalactic origin. We estimate the prospects of detecting individual neutrino sources from a quasi-diffuse superposition of many extragalactic sources at the level of the IceCube observation. Our analysis takes into account ensemble variations of the source distribution as well as the event statistics of individual sources. We show that IceCube in its present configuration is sensitive to rare < 10^-8 Mpc^-3 yr^-1 transient source classes within 5 years of operation via the observation of multiplets. Identification of time-independent sources is more challenging due to larger backgrounds. We estimate that during the same period IceCube is sensitive to sparse sources with densities of < 10^-6 Mpc^-3 via association of events with the closest 100 sources of an ensemble. We show that a next-generation neutrino observatory with 5 times the effective area of IceCube and otherwise similar detector performance would increase the sensitivity to source densities and rates by about two orders of magnitude.

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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