Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Journal of Cosmology and Astroparticle Physics art. 017 [11 p.] gravitational lensing neutrino astronomy 2014 fdi:010063151 ENG Journal of Cosmology and Astroparticle Physics 1475-7516 ISI:000346105300018 11 10.1088/1475-7516/2014/11/017 https://www.documentation.ird.fr/hor/fdi:010063151 https://www.documentation.ird.fr/intranet/publi/2015/01/010063151.pdf Horizon (IRD) 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 x 10(46) erg 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. 060 ; 030 UR235 / UR082 Maroc