TY - JOUR

T1 - Global simulations of galactic discs

T2 - violent feedback from clustered supernovae during bursts of star formation

AU - Martizzi, Davide

PY - 2020/2/1

Y1 - 2020/2/1

N2 - A suite of idealized, global, gravitationally unstable, star-forming galactic disc simulations with 2 pc spatial resolution, performed with the adaptive mesh refinement code RAMSES, is used in this paper to predict the emergent effects of supernova feedback. The simulations include a simplified prescription for the formation of single stellar populations of mass similar to 100M(circle dot), radiative cooling, photoelectric heating, an external gravitational potential for a dark matter halo and an old stellar disc, self-gravity, and a novel implementation of supernova feedback. The results of these simulations show that gravitationally unstable discs can generate violent supersonic winds with mass-loading factors eta greater than or similar to 10, followed by a galactic fountain phase. These violent winds are generated by highly clustered supernovae exploding in dense environments created by gravitational instability, and they are not produced in simulation without self-gravity. The violent winds significantly perturb the vertical structure of the disc, which is later re-established during the galactic fountain phase. Gas resettles into a quasisteady, highly turbulent disc with volume-weighted velocity dispersion sigma > 50 km s(-1). The new configuration drives weaker galactic winds with a mass-loading factor eta

AB - A suite of idealized, global, gravitationally unstable, star-forming galactic disc simulations with 2 pc spatial resolution, performed with the adaptive mesh refinement code RAMSES, is used in this paper to predict the emergent effects of supernova feedback. The simulations include a simplified prescription for the formation of single stellar populations of mass similar to 100M(circle dot), radiative cooling, photoelectric heating, an external gravitational potential for a dark matter halo and an old stellar disc, self-gravity, and a novel implementation of supernova feedback. The results of these simulations show that gravitationally unstable discs can generate violent supersonic winds with mass-loading factors eta greater than or similar to 10, followed by a galactic fountain phase. These violent winds are generated by highly clustered supernovae exploding in dense environments created by gravitational instability, and they are not produced in simulation without self-gravity. The violent winds significantly perturb the vertical structure of the disc, which is later re-established during the galactic fountain phase. Gas resettles into a quasisteady, highly turbulent disc with volume-weighted velocity dispersion sigma > 50 km s(-1). The new configuration drives weaker galactic winds with a mass-loading factor eta

KW - hydrodynamics

KW - methods: numerical

KW - galaxies: evolution

KW - galaxies: general

KW - STELLAR FEEDBACK

KW - GALAXY FORMATION

KW - INTERSTELLAR TURBULENCE

KW - MOLECULAR CLOUDS

KW - DWARF GALAXIES

KW - DRIVEN ISM

KW - DARK

KW - EVOLUTION

KW - DENSITY

KW - MATTER

U2 - 10.1093/mnras/stz3419

DO - 10.1093/mnras/stz3419

M3 - Journal article

VL - 492

SP - 79

EP - 95

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 1

ER -