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Abstract Accretion onto black holes powers some of the most energetic sources in the Universe, yet its behaviour across the luminosity range remains poorly understood. Specifically, as the luminosity approaches the Eddington limit (LEdd), the inner accretion disk is expected to depart from the standard thin-disk solution, becoming vertically extended. The luminosity threshold and observational signatures of this transition remain, however, uncertain.
Abstract Evidence has mounted in recent decades that outflows of matter and energy from the central few parsecs of our Galaxy have shaped the observed structure of the Milky Way on a variety of larger scales1. On scales of 15 parsecs, the Galactic Centre has bipolar lobes that can be seen in both the X-ray and radio parts of the spectrum2,3, indicating broadly collimated outflows from the centre, directed perpendicular to the Galactic plane.
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