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Multi-wavelength observations indicate that some starburst galaxies show adominant non-thermal contribution from their central region. These activegalactic nuclei (AGN)-starburst composites are of special interest, as bothphenomena on their own are potential sources of highly-energetic cosmic raysand associated gamma-ray and neutrino emission. In this work, a homogeneous,steady-state two-zone multi-messenger model of the non-thermal emission fromthe AGN corona as well as the circumnuclear starburst region is developed andsubsequently applied to the case of NGC 1068, which has recently shown somefirst indications of high-energy neutrino emission. Here, we show that theentire spectrum of multi-messenger data - from radio to gamma-rays includingthe neutrino constraint - can be described very well if both, starburst and AGNcorona, are taken into account. Using only a single emission region is notsufficient.

Solving the multi-messenger puzzle of the AGN-starburst composite galaxy NGC 1068