Dark-ages Reionization and Galaxy Formation Simulation - XV. Stellar evolution and feedback in dwarf galaxies at high redshift
arXiv:1808.03433 · doi:10.1093/mnras/stz1380
Abstract
We directly compare predictions of dwarf galaxy properties in a semi-analytic model (SAM) with those extracted from a high-resolution hydrodynamic simulation. We focus on galaxies with halo masses of 1e9<Mvir/Msol<1e11 at high redshift (). We find that, with the modifications previously proposed in Qin et al. (2018), including to suppress the halo mass and baryon fraction, as well as to modulate gas cooling and star formation efficiencies, the SAM can reproduce the cosmic evolution of galaxy properties predicted by the hydrodynamic simulation. These include the galaxy stellar mass function, total baryonic mass, star-forming gas mass and star formation rate at . However, this agreement is only possible by reducing the star formation threshold relative to that suggested by local observations. Otherwise, too much star-forming gas is trapped in quenched dwarf galaxies. We further find that dwarf galaxies rapidly build up their star-forming reservoirs in the early universe (), with the relevant time-scale becoming significantly longer towards lower redshifts. This indicates efficient accretion in cold mode in these low-mass objects at high redshift. Note that the improved SAM, which has been calibrated against hydrodynamic simulations, can provide more accurate predictions of high-redshift dwarf galaxy properties that are essential for reionization study.
18 pages, 9 figures; submitted to MNRAS, comments are welcome
References in corpus (27)
- The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
- Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
- UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
- A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
- The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
- Chemical enrichment in cosmological, smoothed particle hydrodynamics simulations
- The Role of Pressure in GMC Formation II: The H_2 - Pressure Relation
- COLD GASS, an IRAM Legacy Survey of Molecular Gas in Massive Galaxies: II. The non-universality of the Molecular Gas Depletion Timescale
- Faint AGNs at z>4 in the CANDELS GOODS-S field: looking for contributors to the reionization of the Universe
- Cosmological Radiative Transfer Codes Comparison Project I: The Static Density Field Tests
- The Birth of a Galaxy. II. The Role of Radiation Pressure
- The Abacus Cosmos: A Suite of Cosmological N-body Simulations
- ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Search for [CII] line and dust emission in 6<z<8 galaxies
- Large turbulent reservoirs of cold molecular gas around high-redshift starburst galaxies
- ALMA [CII] detection of a redshift 7 lensed galaxy behind RXJ1347.1-1145
- The accuracy of semi-numerical reionization models in comparison with radiative transfer simulations
- How to get cool in the heat: comparing analytic models of hot, cold, and cooling gas in haloes and galaxies with EAGLE
- Comparing galaxy formation in semi-analytic models and hydrodynamical simulations
- Validating Semi-Analytic Models of High-Redshift Galaxy Formation using Radiation Hydrodynamical Simulations
- The new semianalytic code GalICS 2.0 - Reproducing the galaxy stellar mass function and the Tully-Fisher relation simultaneously
- Dark-ages reionization and galaxy formation simulation--VII. The sizes of high-redshift galaxies
- Low-mass galaxy formation and the ionizing photon budget during reionization
- Dark-ages Reionization & Galaxy Formation Simulation VIII. Suppressed growth of dark matter halos during the Epoch of Reionization
- A new gas cooling model for semi-analytical galaxy formation models
- Dark-ages reionization and galaxy formation simulation - IX. Economics of reionizing galaxies
- A comparison between semi-analytical gas cooling models and cosmological hydrodynamical simulations
- Dark-ages Reionization and Galaxy Formation Simulation - XIV. Gas accretion, cooling and star formation in dwarf galaxies at high redshift