Search for Correlations of High-Energy Neutrinos with Infrared Flares in AGNs

The IceCube Neutrino Observatory issues real-time high-energy (HE) neutrino alerts and has released its first catalog (IceCat-1). However, the origin of these neutrinos remains largely unknown. Active galactic nuclei (AGNs) exhibiting variability are promising candidate sources, and previous studies have suggested temporal correlations between HE neutrino alerts and infrared (IR) flares. In this contribution, we perform a spatio-temporal correlation analysis between IceCube HE neutrino alerts and a sample of Wide-field Infrared Survey Explorer (WISE)-selected AGNs and radio-loud blazars, both cross-matched with the Fermi-LAT 4FGL-DR2 catalog. IR light curves are primarily used in the analysis, while additional $\gamma$-ray light curves are included for a subset of sources to investigate multi-band behavior. No significant correlation is found in the IR band. The most significant result appears in the $\gamma$-ray band for a subset of blazars, with a pretrial p-value of 0.05%, primarily driven by TXS 0506+056 and PKS 0446+112. However, no significant excess remains after removing these two sources. Additionally, we investigate the multi-wavelength behavior of promising candidate sources, from radio to $\gamma$-rays.