A new set of 3D simulations reveals that shockwaves from dying stars and stellar winds may sculpt hub-and-spoke structures in molecular clouds, creating features resembling a 'cosmic wagon wheel'. These patterns, where gas streams converge toward a dense central hub, have long been observed in stellar nurseries but their origin remained unclear.
The simulations indicate that the powerful shockwaves generated by supernovae and the steady outflow from massive stars carve filamentary funnels through the gas and dust of molecular clouds. This process drives material inward toward a central hub, much like spokes meeting at the center of a spoke-wheel, and may help explain why star formation in these environments is often surprisingly inefficient.
By modeling the interaction between shockwaves and the turbulent interstellar medium, researchers found that the hub-and-spoke configuration is a natural consequence of stellar feedback. The work challenges previous assumptions that such structures were primarily shaped by gravitational collapse or magnetic fields alone.
The findings carry significant implications for understanding star formation in the Milky Way. If shockwaves are indeed the primary sculptors, it suggests that the lifecycle of stars is more intimately tied to the deaths of others than previously thought, with dying stars actively steering the birth of new ones.
However, the study relies entirely on simulations, which may not capture all real-world variables within the complex interstellar environment. Direct observational confirmation remains challenging, given the vast scales and long timescales involved in star formation processes.