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arXiv 1502.03313astro-ph.HE
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用Parkes radio telescope对月球观测的超高能中微子通量的极限

A limit on the ultra-high-energy neutrino flux from lunar observations with the Parkes radio telescope

J. D. Bray, R. D. Ekers, P. Roberts, J. E. Reynolds, C. W. James, C. J. Phillips, R. J. Protheroe, R. A. McFadden, M. G. Aartsen

摘要:

我们报告的超高能中微子通量的基础上的无线电脉冲的中微子引发的粒子级联在月球上,在与Parkes射电望远镜进行的LUNASKA项目的一部分的观测的非检测的限制。由于这些观测的灵敏度提高,有效持续时间为127小时,频率范围为1.2-1.5 GHz,这一极限扩展到比以前的月球射电实验更低的中微子能量,检测阈值低于10^20 eV。我们的极限的计算考虑到了月球起源脉冲被误认为本地无线电干扰的可能性,并包括小尺度月球表面粗糙度的影响。观测的目标策略也使我们能够对来自附近射电星系半人马座A的中微子通量施加方向限制。

英文摘要:

We report a limit on the ultra-high-energy neutrino flux based on a non-detection of radio pulses from neutrino-initiated particle cascades in the Moon, in observations with the Parkes radio telescope undertaken as part of the LUNASKA project. Due to the improved sensitivity of these observations, which had an effective duration of 127 hours and a frequency range of 1.2-1.5 GHz, this limit extends to lower neutrino energies than those from previous lunar radio experiments, with a detection threshold below 10^20 eV. The calculation of our limit allows for the possibility of lunar-origin pulses being misidentified as local radio interference, and includes the effect of small-scale lunar surface roughness. The targeting strategy of the observations also allows us to place a directional limit on the neutrino flux from the nearby radio galaxy Centaurus A.

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