Although the IceCube Neutrino Observatory detected hundreds of high-energy neutrinos, only a few point-like sources had evidence of being their electromagnetic counterparts. In a steady scenario, the Seyfert type 2 Galaxy NGC 1068 is spatially coincident with a neutrino source, and its statistical significance is 4.2 sigma over nine years of data acquisition. On the other hand, in transient phenomena, the neutrino IceCube-170922A was detected by IceCube when the blazar TXS 0506+056 was in a flare state along the electromagnetic spectrum; this association had a statistical significance of 3.5 sigma. In this work, we explore the possible association of Quasars detected by Fermi-LAT in 14 years of data, which are in spatial coincidence of high-energy neutrinos detected by IceCube, modeling the Spectral Energy Distribution of those objects assuming a lepto-hadronic spectrum. Based on the case of TXS 0506+056 and the neutrino IceCube 170922A, we search possible candidates assuming a single emission region with a time-dependent model looking for evidence of a flare state in those objects.

Although the IceCube Neutrino Observatory detected hundreds of high-energy neutrinos, only a few point-like sources had evidence of being their electromagnetic counterparts. In a steady scenario, the Seyfert type 2 Galaxy NGC 1068 is spatially coincident with a neutrino source, and its statistical significance is 4.2 sigma over nine years of data acquisition. On the other hand, in transient phenomena, the neutrino IceCube-170922A was detected by IceCube when the blazar TXS 0506+056 was in a flare state along the electromagnetic spectrum; this association had a statistical significance of 3.5 sigma. In this work, we explore the possible association of Quasars detected by Fermi-LAT in 14 years of data, which are in spatial coincidence of high-energy neutrinos detected by IceCube, modeling the Spectral Energy Distribution of those objects assuming a lepto-hadronic spectrum. Based on the case of TXS 0506+056 and the neutrino IceCube 170922A, we search possible candidates assuming a single emission region with a time-dependent model looking for evidence of a flare state in those objects.