Entropy Driven Winds: Outflows and Fountains Lifted Gently by Buoyancy

TL;DR

This paper introduces a new theoretical framework based on entropy to explain how supernova-driven outflows are launched and sustained in disc galaxies, emphasizing buoyant acceleration in the circumgalactic medium.

Contribution

It develops an equation of motion for entropy-driven winds, linking ISM, halo, and CGM properties, and demonstrates how this explains observed galactic outflow kinematics and long recycling times.

Findings

Entropy-driven winds can reach high galactocentric radii with low initial velocities.

The framework explains observed CGM kinematics and long wind recycling times.

Simulations and observations support the buoyant acceleration mechanism.

Abstract

We present a new theoretical framework for using entropy to understand how outflows driven by supernovae are launched from disc galaxies: via continuous, buoyant acceleration through the circumgalactic medium (CGM). When young star clusters detonate supernovae in the interstellar medium (ISM) of a galaxy, they generate hot, diffuse bubbles that push on the surrounding ISM and evaporate that ISM into their interiors. As these bubbles reach the scale height of the ISM, they break out of the disc, rising into the CGM. Once these bubbles break out, if they have sufficiently high entropy, they will feel an upward acceleration, owing to a local buoyant force. This upward force will accelerate these bubbles, driving them to high galactocentric radii, keeping them in the CGM for $>\Gyr$, even if their initial velocity is much lower than the local escape velocity. We derive an equation of motion for these entropy-driven winds that connects the ISM properties, halo mass, and CGM profile of galaxies to the ultimate evolution of feedback-driven winds. We explore the parameter space of these equations, and show how this novel framework can explain both self-consistent simulations of star formation and galactic outflows as well as the new wealth of observations of CGM kinematics. We show that these entropy-driven winds can produce long wind recycling times, while still carrying a significant amount of mass. Comparisons to simulations and observations show entropy-driven winds convincingly explain the kinematics of galactic outflows.