The apparent L_nu -- L_X correlation in AGN is an artifact of TS-based selection restricting neutrino flux to a narrow range while distances span four orders of magnitude, making luminosity dominated by the distance term.
Time-Dependent Point Source Search Methods in High Energy Neutrino Astronomy
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abstract
We present maximum-likelihood search methods for time-dependent fluxes from point sources, such as flares or periodic emissions. We describe a method for the case when the time dependence of the flux can be assumed a priori from other observations, and we additionally describe a method to search for bursts with an unknown time dependence. In the context of high energy neutrino astronomy, we simulate one year of data from a cubic-kilometer scale neutrino detector and characterize these methods and equivalent binned methods with respect to the duration of neutrino emission. Compared to standard time-integrated searches, we find that up to an order of magnitude fewer events are needed to discover bursts with short durations, even when the burst time and duration are not known a priori.
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On the Apparent Correlation between X-ray and Neutrino Luminosities of Active Galactic Nuclei
The apparent L_nu -- L_X correlation in AGN is an artifact of TS-based selection restricting neutrino flux to a narrow range while distances span four orders of magnitude, making luminosity dominated by the distance term.