Constraining the neutrino emission of gravitationally lensed Flat-Spectrum Radio Quasars with ANTARES data

TL;DR

This study uses gravitational lensing to enhance the sensitivity of neutrino telescopes, setting new constraints on neutrino emissions from distant lensed quasars with ANTARES data.

Contribution

It introduces a novel method leveraging gravitational lensing to improve neutrino emission constraints from distant blazars.

Findings

Strongest neutrino luminosity limit for B0218+357: 1.08×10^46 erg/s

Lensed quasar constraints are an order of magnitude better than previous non-lensed searches

Demonstrates the potential of lensing to enhance neutrino detection sensitivity

Abstract

This paper proposes to exploit gravitational lensing effects to improve the sensitivity of neutrino telescopes to the intrinsic neutrino emission of distant blazar populations. This strategy is illustrated with a search for cosmic neutrinos in the direction of four distant and gravitationally lensed Flat-Spectrum Radio Quasars. The magnification factor is estimated for each system assuming a singular isothermal profile for the lens. Based on data collected from 2007 to 2012 by the ANTARES neutrino telescope, the strongest constraint is obtained from the lensed quasar B0218+357, providing a limit on the total neutrino luminosity of this source of $1.08\times 10^{46}\,\mathrm{erg}\,\mathrm{s}^{-1}$. This limit is about one order of magnitude lower than those previously obtained in the ANTARES standard point source searches with non-lensed Flat-Spectrum Radio Quasars.