Publication
ANTARES Search for Point Sources of Neutrinos Using Astrophysical Catalogs: A Likelihood Analysis
Publisher:
American Astronomical Society
Date:
04-2021
DOI:
10.3847/1538-4357/ABE53C
Abstract: A search for astrophysical pointlike neutrino sources using the data collected by the ANTARES detector between 2007 January 29 and 2017 December 31 is presented. A likelihood method is used to assess the significance of an excess of muon neutrinos inducing track-like events in correlation with the location of a list of possible sources. Different sets of objects are tested in the analysis: (a) a subs le of the Fermi 3LAC catalog of blazars, (b) a jet-obscured population of active galactic nuclei, (c) a s le of hard X-ray selected radio galaxies, (d) a star-forming galaxy catalog, and (e) a public s le of 56 very-high-energy track events from the IceCube experiment. None of the tested sources shows a significant association with the s le of neutrinos detected by ANTARES. The smallest p -value is obtained for the catalog of radio galaxies with an equal-weights hypothesis, with a pre-trial p -value equivalent to a 2.8 σ excess, which is equivalent to 1.6 σ post-trial. In addition, the results of a dedicated analysis for the blazar MG3 J225517+2409 are also reported: this source is found to be the most significant within the Fermi 3LAC s le, with five ANTARES events located less than one degree from the source. This blazar showed evidence of flaring activity in Fermi data, in spacetime coincidence with a high-energy track detected by IceCube. An a posteriori significance of 2.6 σ for the combination of ANTARES and IceCube data is reported.