http://arxiv.org/abs/1701.02165
After the discovery of extraterrestrial high-energy neutrinos, the next major goal of neutrino telescopes will be identifying astrophysical objects that produce them. However, the flux of the brightest source $F_{\rm max}$ cannot be probed by studying the diffuse neutrino intensity. We aim at constraining $F_{\rm max}$ by adopting a broken power-law flux distribution, a hypothesis supported by the observed properties of any generic astrophysical sources. The first estimate of $F_{\rm max}$ comes from the fact that we can only observe one universe, and hence, the expected number of sources above $F_{\rm max}$ cannot be too small compared to one. For abundant source classes such as starburst galaxies, this one-source constraint yields a value of $F_{\rm max}$ that is an order of magnitude lower than the current upper limits from point-source searches. We also derive upper limits on $F_{\rm max}$ from the fact that the angular power spectrum is consistent with neutrino shot noise yet. This limit will improve nearly quadratically with exposure, and therefore provide a powerful probe for rare sources such as blazars with the next generation of neutrino telescopes.
S. Ando, M. Feyereisen and M. Fornasa
Tue, 10 Jan 17
15/75
Comments: 10 pages, 7 figures, submitted to Phys.Rev.D
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