Search for neutrino emission from hard X-ray AGN with IceCube
R. Abbasi, M. Ackermann, J. Adams, S. K. Agarwalla, J. A. Aguilar, M., Ahlers, J.M. Alameddine, N. M. Amin, K. Andeen, C. Arg\"uelles, Y. Ashida, S., Athanasiadou, L. Ausborm, S. N. Axani, X. Bai, A. Balagopal V., M. Baricevic,, S. W. Barwick, S. Bash, V. Basu, R. Bay

TL;DR
This study searched for high-energy neutrinos from hard X-ray AGN using IceCube data, finding no significant overall emission but detecting excesses from NGC 1068 and NGC 4151, suggesting potential astrophysical neutrino sources.
Contribution
First comprehensive search for neutrinos from hard X-ray AGN with IceCube, identifying specific sources with excess neutrino emission.
Findings
No significant stacked emission detected.
Significant neutrino excess from NGC 1068.
Moderate excess from NGC 4151 with 2.9σ significance.
Abstract
Active Galactic Nuclei (AGN) are promising candidate sources of high-energy astrophysical neutrinos since they provide environments rich in matter and photon targets where cosmic ray interactions may lead to the production of gamma rays and neutrinos. We searched for high-energy neutrino emission from AGN using the -BAT Spectroscopic Survey (BASS) catalog of hard X-ray sources and 12 years of IceCube muon track data. First, upon performing a stacked search, no significant emission was found. Second, we searched for neutrinos from a list of 43 candidate sources and found an excess from the direction of two sources, Seyfert galaxies NGC 1068 and NGC 4151. We observed NGC 1068 at flux = TeV cm s normalized at 1 TeV, with power-law spectral index, = 3.10,…
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