A large, long-lived, slowly-expanding superbubble across the Perseus Arm
arXiv:2512.21927 · doi:10.1038/s41467-025-65591-5
Abstract
Stellar feedback is a crucial mechanism in galactic evolution, as demonstrated by the widespread bubbles observed with JWST. In this study, we combine data from Gaia and LAMOST to obtain a sample of young O-B2 stars with full three-dimensional velocity information. Focusing on the largest known superbubble in the Milky Way, we identify groups of O-B2 stars at its periphery, exhibiting a transverse velocity of 25.8 km/s and an expansion velocity of 6.2 km/s. Using these velocities, we calculate a crossing time t_cross ~ 20 Myr and an expansion timescale t_expansion ~ 80 Myr. We estimate a survival timescale t_survival ~ 250 Myr and a supernova interval t_SN ~ 0.1 Myr. Together with the Galactic shear timescale t_shear ~ 30 Myr, these values satisfy t_SN < t_shear < t_survival. The energy and momentum from supernovae are sufficient to sustain the bubble's growth against ambient pressure. This indicates that repeated supernovae replenish energy faster than shear and turbulent distort the cavity. Our analysis classifies the Giant Oval Cavity as a large, quasi-stationary superbubble, similar to the Phantom Bubble observed by JWST, stabilised by the interplay between stellar feedback and Galactic disk dynamics.
Published in Nature Communications
References in corpus (21)
- Physical properties of molecular clouds for the entire Milky Way disk
- Gaia-2MASS 3D maps of Galactic interstellar dust within 3 kpc
- Star formation near the Sun is driven by expansion of the Local Bubble
- Three-dimensional extinction maps: Inverting inter-calibrated extinction catalogues
- Discovery of a relationship between spiral arm morphology and supermassive black hole mass in disk galaxies
- Stellar labels for hot stars from low-resolution spectra - I. the HotPayne method and results for 330,000 stars from LAMOST DR6
- Expanding bubbles in Orion A: [CII] observations of M42, M43, and NGC 1977
- The Star Formation Rate of the Milky Way as seen by Herschel
- PHANGS-JWST First Results: A statistical view on bubble evolution in NGC628
- The Galactic spiral structure as revealed by O- and early B-type stars
- Distribution and kinematics of atomic and molecular gas inside the Solar circle
- The Parallax Zero-Point of Gaia Early Data Release 3 from LAMOST Primary Red Clump Stars
- Spiral structure in nearby galaxies II. comparative analysis and conclusions
- Three-Dimensional Distribution of the Interstellar Dust in the Milky Way
- Local Stellar Kinematics and Oort Constants from the LAMOST A-type Stars
- Constraining the Galactic structure parameters with the XSTPS-GAC and SDSS photometric surveys
- Galactic 26Al traces metal loss through hot chimneys
- Kinematics of the molecular interstellar medium probed by Gaia: steep velocity dispersion-size relation, isotropic turbulence, and location-dependent energy dissipation
- Synthetic Al emission from galactic-scale superbubble simulations
- Did the Milky Way just light up? The recent star formation history of the Galactic disc
- Weather Forecast of the Milky Way: Shear and Stellar feedback determine the lives of Galactic-scale filaments