2024/11/03 by S. C. Ji, Zhongxiang Wang, Ji, Shunhao +3 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2411.01448
We report our counterpart identification study for two high-energy, Gold neutrino events IC-130127A and IC-131204A listed in the IceCube Event Catalog of Alert Tracks. Within the events' 90% positional uncertainty regions, we respectively find PKS~2332-017 and PMN J1916-1519. The first source is a flat-spectrum radio quasar at redshift z= 1.18 and the second a blazar of an uncertain type with photometric z= 0.968. As they correspondingly had a γ-ray flare temporally coincident with the arrival times of IC-130127A and IC-131204A, we identify them as the respective neutrino emitters. Detailed analysis of the γ-ray data for the two blazars, obtained with the Large Area Telescope (LAT) onboard \it the Fermi Gamma-ray Space Telescope (Fermi), is conducted. The two flares respectively from PKS~2332-017 and PMN~J1916-1519 lasted ∼4 yr and ∼4 month, and showed possible emission hardening by containing high-energy ∼2--10 GeV photons in the emissions. Accompanying the flare of PKS~2332-017, optical and MIR brightening variations were also observed. We discuss the properties of the two sources and compare the properties with those of the previously reported (candidate) neutrino-emitting blazars.