How bright can the brightest neutrino source be

After the discovery of extraterrestrial high-energy neutrinos, the next major goal of neutrino telescopes will be identifying astrophysical objects that produce them. The flux of the brightest source F-max, however, cannot be probed by studying the diffuse neutrino intensity. We aim at constraining F-max by adopting a broken power-law flux distribution, a hypothesis supported by observed properties of any generic astrophysical sources. The first estimate of F-max comes from the fact that we can only observe one universe and, hence, the expected number of sources above F-max cannot be too small compared with one. For abundant source classes such as starburst galaxies, this one-source constraint yields a value of F-max that is an order of magnitude lower than the current upper limits from point-source searches. Then we derive upper limits on F-max assuming that the angular power spectrum is still consistent with neutrino shot noise. We find that the limits obtained with upgoing muon neutrinos in IceCube can already be quite competitive, especially for rare but bright source populations such as blazars. The limits will improve nearly quadratically with exposure and, therefore, be even more powerful for the next generation of neutrino telescopes.