R. Abbasi, M. Ackermann, J. Adams, S. K. Agarwalla, J. A. Aguilar, M. Ahlers, J.M. Alameddine, Syed Mashhood Ali, N. M. Amin, K. Andeen, C. Argüelles, Yosuke Ashida, S. Athanasiadou, S. N. Axani, Rishi Babu, X. Bai, J. Baines-Holmes, A. Balagopal V., S. W. Barwick, Simeon Bash, Vedant Basu, Ryan Bay, J. J. Beatty, J. Becker Tjus, P. Behrens, Jakob Beise, Chiara Bellenghi, S. Benkel, Segev BenZvi, D. Berley, Elisa Bernardini, D. Z. Besson, E. Blaufuss, L. Bloom, S. Blot, Imre Bodó, F. Bontempo, J. Y. Book Motzkin, C. Boscolo Meneguolo, S. Böser, O. Botner, J. Böttcher, Jim Braun, Bennett Brinson, Z. Brisson-Tsavoussis, R. T. Burley, D. Butterfield, M. A. Campana, Kiara Carloni, Jose Carpio, S. Chattopadhyay, Nhan Thien Chau, Z. Chen, Dmitry Chirkin, S. Choi, B. A. Clark, Peter John Cusack Coleman, G. H. Collin, D. A. Coloma Borja, A. Connolly, J. M. Conrad, D. F. Cowen, C. De Clercq, J. J. DeLaunay, D. Delgado, T. Delmeulle, S. Deng, P. Desiati, K. D. de Vries, G. de Wasseige, T. DeYoung, J. C. Díaz-Vélez, S. DiKerby, T. Ding, Markus Dittmer, A. Domi, Lincoln Draper, L. Dueser, Daniel Durnford, K. Dutta, M. A. DuVernois, Thomas Ehrhardt, Leonhard Eidenschink, Anna Eimer, C. Eldridge, Philipp Eller, Enrico Ellinger, Dominik Elsässer, R. Engel, H. Erpenbeck, Waleed Esmail, S. Eulig, J. Evans, P. A. Evenson, K. L. Fan, K. Fang, K. Farrag, A. R. Fazely, Anatoli Fedynitch, Nora Feigl
Abstract IceCube recently reported the observation of TeV neutrinos from the nearby Seyfert galaxy NGC 1068, and the corresponding neutrino flux is significantly higher than the upper limit implied by observations of GeV–TeV gamma rays. This suggests that neutrinos are produced near the supermassive black hole, where the radiation density is high enough to obscure gamma rays. We use a set of muon neutrinos with interaction vertices inside the detector, which have good sensitivity to sources in the southern sky, from IceCube data recorded between 2011 and 2021. We then search for individual and collective neutrino signals from 14 Seyfert galaxies in the southern sky selected from the Swift Burst Alert Telescope AGN Spectroscopic Survey. Using the correlations between keV X-rays and TeV neutrinos predicted by disk–corona models, and assuming production characteristics similar to NGC 1068, a collective neutrino signal search reveals an excess of 6 . 7 − 3.2 + 4.0 events, which is inconsistent with background expectations at the 3 σ level of significance. In this Letter, we present new independent evidence that Seyfert galaxies contribute to the extragalactic flux of high-energy neutrinos.