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Fermi and eROSITA bubbles as relics of the past activity of the Galaxy’s central black hole
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Fermi and eROSITA bubbles as relics of the past activity of the Galaxy’s central black hole
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Journal Article
Fermi and eROSITA bubbles as relics of the past activity of the Galaxy’s central black hole
2022
Overview
The newly launched X-ray satellite, eROSITA, has recently revealed two gigantic bubbles extending to ~80° above and below the Galactic Centre. 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 intensely debated; however, because of their symmetry about the Galactic Centre, they probably originate from some energetic outbursts from the Galactic Centre in the past. Here we propose a theoretical model in which the eROSITA bubbles, Fermi bubbles and the microwave haze could be simultaneously explained by a single event of jet activity from the central supermassive black hole a few million years ago. Using numerical simulations, we show that this model could successfully reproduce the morphology and multi-wavelength spectra of the observed bubbles and haze, which allows us to derive critical constraints on the energetics and timescales of the outburst. This study serves as an important step forward in our understanding of the past Galactic Centre activity of our own Galaxy and may bring valuable insights into the broader picture of supermassive-black-hole–galaxy co-evolution in the context of galaxy formation.
The newly discovered eROSITA X-ray bubbles in the Milky Way’s centre, together with the Fermi bubbles and microwave haze, may be explained by a single episode of central supermassive-black-hole jet activity a few million years ago.
Publisher
Nature Publishing Group UK,Nature Publishing Group
