Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 53: Neutrino Astronomy III
T 53.2: Vortrag
Mittwoch, 2. April 2025, 16:30–16:45, VG 1.105
Constraining the contribution of Seyfert galaxies to the astrophysical neutrino flux using NGC 1068 as a benchmark — •Lena Saurenhaus1, Francesca Capel1, and Foteini Oikonomou2 — 1Max-Planck-Institut für Physik, 85748 Garching b. München, Germany — 2Norwegian University of Science and Technology (NTNU), Institutt for fysikk, 7491 Trondheim, Norway
Recently, the IceCube Collaboration reported evidence for TeV neutrino emission from several nearby Seyfert galaxies, with the highest significance found for NGC 1068. The lack of observable gamma rays at TeV energies associated with NGC 1068 suggests that these neutrinos are likely produced in the AGN corona, which is opaque to high-energy gamma rays. Based on this assumption, we simulate the neutrino emission of Seyfert galaxies with different X-ray properties and fit the resulting neutrino spectrum for NGC 1068 to public IceCube data. Using the result of this fit as a benchmark, we extrapolate our model to an entire population of sources simulated based on the X-ray luminosity function of AGNs and estimate the resulting diffuse neutrino flux. By comparing our results with observations, we derive constraints on the neutrino emission properties of the source population and find that NGC 1068 has to be a particularly powerful Seyfert galaxy. In addition, we use our model to evaluate the detection prospects of other nearby Seyfert galaxies besides NGC 1068 in order to obtain a coherent picture of the contribution of these sources to astrophysical neutrino observations.
Keywords: astrophysical neutrinos; active galactic nuclei (AGN); Seyfert galaxies; NGC 1068; IceCube