Galactic Superbubbles in 3D: Wind Formation and Cloud Shielding
arXiv:2404.13498 · doi:10.1088/1742-6596/2796/1/012004
Abstract
Galactic superbubbles are triggered by stellar feedback in the discs of star-forming galaxies. They are important in launching galactic winds, which play a key role in regulating the mass and energy exchange in galaxies. Observations can only reveal projected information and the 3D structure of such winds is quite complex. Therefore, numerical simulations are required to further our understanding of such structures. Here, we describe hydrodynamical simulations targeting two spatial scales. Large-scale superbubble models reveal supernova-driven outflows, and their subsequent merging, which leads to galactic wind formation. Additionally, the turbulence parameter not only affects disc formation, but also influences mass and energy characteristics, controlling gas distribution and the injection rate in the simulated star formation zone. Small-scale wind-multicloud models indicate that isolated clouds are susceptible to instabilities, leading to fragmentation and dense gas destruction. In contrast, in closer cloud configurations, the condensation mechanism becomes important owing to hydrodynamic shielding, which helps to maintain the cold material throughout the evolution of the system. These simulations provide a comprehensive picture of galactic winds, showing how large-scale superbubble dynamics create the environment where small-scale wind-multicloud interactions shape the interstellar and circumgalactic media, ultimately regulating galaxy evolution.
Published in Journal of Physics: Conference Series - XVIII: Encuentro de Física (Physics EPN 2023), available online at: https://doi.org/10.1088/1742-6596/2796/1/012004
References in corpus (10)
- Starburst-driven galactic winds: I. Energetics and intrinsic X-ray emission
- The COS-Halos Survey: Origins of the Highly Ionized Circumgalactic Medium of Star-Forming Galaxies
- The Galactic Centre Chimney
- Evidence for chimney breakout in the Galactic supershell GSH 242-03+37
- The Galactic center chimneys: The base of the multiphase outflow of the Milky Way
- Hydrodynamic Shielding and the Survival of Cold Streams
- A Supernova-driven, Magnetically-collimated Outflow as the Origin of the Galactic Center Radio Bubbles
- A CO Funnel in the Galactic Centre: Molecular Counterpart of the Northern Galactic Chimney?
- Dynamics of hot galactic winds launched from spherically-stratified starburst cores
- Jets, Outflows, and Explosions in Massive Star Formation