Asymmetric eROSITA bubbles as the evidence of a circumgalactic medium wind

Guobin Mou (), Dongze Sun, Taotao Fang (), Wei Wang (), Ruiyu Zhang, Feng Yuan, Yoshiaki Sofue, Tinggui Wang and Zhicheng He
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Guobin Mou: Wuhan University
Dongze Sun: California Institute of Technology
Taotao Fang: Xiamen University
Wei Wang: Wuhan University
Ruiyu Zhang: Henan Normal University
Feng Yuan: Shanghai Astronomical Observatory, Chinese Academy of Sciences
Yoshiaki Sofue: Institute of Astronomy, The University of Tokyo
Tinggui Wang: University of Science and Technology of China
Zhicheng He: University of Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The eROSITA bubbles are detected via the instrument with the same name. The northern bubble shows noticeable asymmetric features, including distortion to the west and enhancement in the eastern edge, while the southern counterpart is significantly dimmer. Their origins are debated. Here, we performed hydrodynamic simulations showing that asymmetric eROSITA bubbles favor a dynamic, circumgalactic medium wind model, but disfavor other mechanisms such as a non-axisymmetric halo gas or a tilted nuclear outflow. The wind from the east by north direction in Galactic coordinates blows across the northern halo with a velocity of about 200 km s−1, and part of it enters the southern halo. This creates a dynamic halo medium and redistributes both density and metallicity within. This naturally explains the asymmetric bubbles in both the morphology and surface brightness. Our results suggest that our Galaxy is accreting low-abundance circumgalactic medium from one side while providing outflow feedback.

Date: 2023
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DOI: 10.1038/s41467-023-36478-0

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