H.E.S.S. observations of composite Seyfert-starburst galaxies
H.E.S.S. Collaboration, A. Acharyya, F. Aharonian, H. Ashkar, M. Backes, V. Barbosa Martins, R. Batzofin, Y. Becherini, D. Berge, M. B\"ottcher, C. Boisson, J. Bolmont, J. Borowska, F. Brun, B. Bruno, C. Burger-Scheidlin, S. Casanova, J. Celic, M. Cerruti, S. Chandra, A. Chen

TL;DR
This study used H.E.S.S. observations to search for very high-energy gamma-ray emission from composite Seyfert-starburst galaxies, aiming to understand cosmic-ray populations, but found no significant signals.
Contribution
First H.E.S.S. observations of these galaxies provide constraints on VHE gamma-ray emission and cosmic-ray models in composite Seyfert-starburst systems.
Findings
No significant VHE gamma-ray signals detected.
Upper limits set on gamma-ray fluxes to constrain models.
Results inform cosmic-ray population theories.
Abstract
Context: Composite galaxies that contain both Seyfert and starburst components may produce very high-energy (VHE; >100 GeV) gamma-ray emission at a wide range of spatial scales, from a few Schwarzschild radii of a supermassive black hole to dimensions of kiloparsec-size jet-driven outflows. In addition to supernova remnants, various sources have been suggested to explain data collected on composite galaxies, including multi-messenger neutrino and ultra-high-energy cosmic-ray data. Aims: The closest composite Seyfert-starburst galaxies (NGC 1068, the Circinus galaxy, and NGC 4945) are observed with the High Energy Stereoscopic System (H.E.S.S.) to provide constraints on cosmic-ray populations in these systems. Methods: Data obtained in H.E.S.S. observations have been analyzed to search for VHE gamma-ray counterparts to the GeV gamma-ray signals detected with Fermi-LAT and for potential…
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Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Dark Matter and Cosmic Phenomena · Astrophysical Phenomena and Observations
