Description
The search for waste heat technosignatures from Dyson Spheres/Swarms has been conducted intermittently over four decades. A recent breakthrough came from Project Hephaistos, which identified 7 candidate stars in 2024. Our follow-up investigation revealed that a fraction of candidates are associated with radio emissions, suggesting potential contamination by obscured Active Galactic Nuclei (AGNs). Using high-resolution e-MERLIN and European VLBI Network (e-VLBI) observations, we successfully detected an AGN that contaminates Dyson Sphere Candidate G. These findings suggest that some apparent infrared excesses attributed to potentially extraterrestrial megastructures may be explained by natural astrophysical phenomena.
Primary author
Tongtian Ren
(University of Manchester)
