Hydrodynamic Simulations of Galaxy Formation. II. Photoionization and the Formation of Low Mass Galaxies

Abstract

Photoionization by the high-redshift ultraviolet radiation background heats low density gas before it falls into dark matter potential wells, and it eliminates the neutral hydrogen and singly ionized helium that dominate cooling of primordial gas at temperatures of $10^4-10^5$K. We investigate the influence of photoionization on galaxy formation using high-resolution simulations with a 1-dimensional, spherically symmetric, Lagrangian hydrodynamics/gravity code. We find that the presence of a photoionizing background suppresses the formation of galaxies with circular velocities $v_{circ} \simlt 30\,$\kms\ and substantially reduces the mass of cooled baryons in systems with circular velocities up to $v_{circ}\sim 50$\kms. Above $v_{circ}\sim 75$\kms, photoionization has no significant effect. Photoionization exerts its influence primarily by heating gas before collapse; the elimination of line cooling processes is less important. We discuss the implications of these results for hierarchical theories of galaxy formation.

22 pages, uuencoded compressed postscript with figures. Submitted to ApJ. Latest version also available at http://cfata2.harvard.edu/thoul/papers.html

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• An Improved Treatment of Cosmological Intergalactic Medium Evolution
• Cosmological prior for the $J$-factor estimation of dwarf spheroidal galaxies
• Diversity of the Lyman continuum escape fractions of high-$z$ galaxies and its origins
• Unveiling the nature and fate of the almost-dark cloud AGC 226178 through HI mapping
• Devouring The Centaurus A Satellites: Modeling Dwarf Galaxies with Galacticus
• How do dwarf galaxies acquire their mass & when do they form their stars?
• Spatial Correlation of Massive Black Hole Mergers: Probing the Formation Mechanism and Reionization
• HI-selected Galaxies as a probe of Quasar Absorption Systems
• Aeos: The Impact of Population III Initial Mass Function and Star-by-Star Models in Galaxy Simulations
• The Luminosity Function in Groups of Galaxis
• Forward-modelling the Luminosity, Distance, and Size distributions of the Milky Way Satellites
• Probing Reionization with the Cosmological Proximity Effect and High-Redshift Supernovae Rates
• CROCODILE-DWARF: Assembly and Kinematics of Field Dwarf Galaxies with GADGET4-OSAKA
• An Estimate of the Impact of Reionization on Supermassive Black Hole Growth
• Mapping the z>=5 SiIV Column Density Distribution onto the Galaxy Stellar Mass Function Using the Cumulative Absorption Cross Section
• Exploring the Voids: Luminosity Functions and Magnetic Field
• A joint measurement of galaxy luminosity functions and large-scale field densities during the Epoch of Reionization