A thermal-kinetic subgrid model for supernova feedback in simulations of galaxy formation

Autor(en)
Evgenii Chaikin, Joop Schaye, Matthieu Schaller, Alejandro Benítez-Llambay, Folkert Nobels, Sylvia Plöckinger
Abstrakt

We present a subgrid model for supernova feedback designed for cosmological simulations of galaxy formation that may include a cold interstellar medium (ISM). The model uses thermal and kinetic channels of energy injection, which are built upon the stochastic kinetic and thermal models for stellar feedback used in the owls and eagle simulations, respectively. In the thermal channel, the energy is distributed statistically isotropically and injected stochastically in large amounts per event, which minimizes spurious radiative energy losses. In the kinetic channel, we inject the energy in small portions by kicking gas particles in pairs in opposite directions. The implementation of kinetic feedback is designed to conserve energy, linear and angular momentum, and is statistically isotropic. To test the model, we run simulations of isolated Milky Way-mass and dwarf galaxies, in which the gas is allowed to cool down to 10 K. Using the thermal and kinetic channels together, we obtain smooth star formation histories and powerful galactic winds with realistic mass loading factors. Furthermore, the model produces spatially resolved star formation rates (SFRs) and velocity dispersions that are in agreement with observations. We vary the numerical resolution by several orders of magnitude and find excellent convergence of the global SFRs and wind mass loading. We show that large thermal energy injections generate a hot phase of the ISM and modulate the star formation by ejecting gas from the disc, while the low-energy kicks increase the turbulent velocity dispersion in the neutral ISM, which in turn helps suppress star formation.

Organisation(en)
Institut für Astrophysik
Externe Organisation(en)
Leiden University, Università degli Studi di Milano-Bicocca
Journal
MNRAS
Band
523
Seiten
3709-3731
Anzahl der Seiten
23
ISSN
0035-8711
DOI
https://doi.org/10.1093/mnras/stad1626
Publikationsdatum
08-2023
Peer-reviewed
Ja
ÖFOS 2012
103004 Astrophysik
Schlagwörter
ASJC Scopus Sachgebiete
Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/a-thermalkinetic-subgrid-model-for-supernova-feedback-in-simulations-of-galaxy-formation(63d698e4-35ff-4e4a-92c4-968c935573a0).html