Fermi/eROSITA bubbles as relics of the past activity of the galaxy's central black hole.

The eROSITA X-ray satellite has revealed two gigantic bubbles extending to ∼ 8 0 ∘ above and below the Galactic center (GC). The morphology of these "eROSITA bubbles" bears a remarkable resemblance to the Fermi bubbles previously discovered by the Fermi Gamma-ray Space Telescope and its counterpart, the microwave haze. The physical origin of these striking structures has been a subject of active debate, though their symmetry about the GC strongly suggests they resulted from powerful outbursts from the GC. In this Conference Proceedings, we present a concise review of the important progress made over the years, encompassing both multi-messenger observational constraints and theoretical models proposed to explain their physical origin. We show that the Fermi/eROSITA bubbles likely originate from past activity of the GC supermassive black hole, Sgr A∗. Remaining open questions and future research directions are also discussed. [ABSTRACT FROM AUTHOR]