Kavli Affiliate: Mark Vogelsberger
| First 5 Authors: Rahul Kannan, Ewald Puchwein, Aaron Smith, Josh Borrow, Enrico Garaldi
| Summary:
We introduce the THESAN-ZOOM project, a comprehensive suite of
high-resolution zoom-in simulations of $14$ high-redshift ($z>3$) galaxies
selected from the THESAN simulation volume. This sample encompasses a diverse
range of halo masses, with $M_mathrm{halo} approx 10^8 –
10^{13}~mathrm{M}_odot$ at $z=3$. At the highest-resolution, the simulations
achieve a baryonic mass of $142~mathrm{M}_odot$ and a gravitational softening
length of $17~mathrm{cpc}$. We employ a state-of-the-art multi-phase
interstellar medium (ISM) model that self-consistently includes stellar
feedback, radiation fields, dust physics, and low-temperature cooling through a
non-equilibrium thermochemical network. Our unique framework incorporates the
impact of patchy reionization by adopting the large-scale radiation field
topology from the parent THESAN simulation box rather than assuming a spatially
uniform UV background. In total, THESAN-ZOOM comprises $60$ simulations,
including both fiducial runs and complementary variations designed to
investigate the impact of numerical and physical parameters on galaxy
properties. The fiducial simulation set reproduces a wealth of high-redshift
observational data such as the stellar-to-halo-mass relation, the star-forming
main sequence, the Kennicutt-Schmidt relation, and the mass-metallicity
relation. While our simulations slightly overestimate the abundance of low-mass
and low-luminosity galaxies they agree well with observed stellar and UV
luminosity functions at the higher mass end. Moreover, the star-formation rate
density closely matches the observational estimates from $z=3-14$. These
results indicate that the simulations effectively reproduce many of the
essential characteristics of high-redshift galaxies, providing a realistic
framework to interpret the exciting new observations from JWST.
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