The Fermi and eROSITA bubbles likely result from identical ~10^56 erg collimated outbursts separated by ~10 Myr, with asymmetry indicating an eastern ambient density gradient.
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Nested Fermi and eROSITA bubbles require very similar $\sim10^{56}$ erg collimated Galactic-center outbursts; their asymmetry indicates an eastern density gradient
The Fermi and eROSITA bubbles likely result from identical ~10^56 erg collimated outbursts separated by ~10 Myr, with asymmetry indicating an eastern ambient density gradient.