Nested Fermi and eROSITA bubbles require very similar $\sim 10^{56}$ erg collimated Galactic-center outbursts; their asymmetry indicates an eastern density gradient

Arka Ghosh, Uri Keshet, Santanu Mondal

Observations indicate two nested pairs of extended bipolar bubbles emanating from the Milky-Way center - the $|b|\sim 80^{\circ }$ latitude eROSITA bubbles (RBs), encompassing the smal…