A consistent model for both the HI and stellar mass functions of galaxies

Abstract

Using the L-Galaxies semi-analytic model we simultaneously fit the HI mass function, stellar mass function and galaxy colours. We find good fits to all three observations at z = 0 and to the stellar mass function and galaxy colours at z = 2. Using Markov Chain Monte Carlo (MCMC) techniques we adjust the L-Galaxies parameters to best fit the constraining data. In order to fit the HI mass function we must greatly reduce the gas surface density threshold for star formation, thus lowering the number of low HI mass galaxies. A simultaneous reduction in the star formation efficiency prevents the over production of stellar content. A simplified model in which the surface density threshold is eliminated altogether also provides a good fit to the data. Unfortunately, these changes weaken the fit to the Kennicutt-Schmidt relation and raise the star-formation rate density at recent times, suggesting that a change to the model is required to prevent accumulation of gas onto dwarf galaxies in the local universe.

10 pages, 10 figures, submitted to mnras

References in corpus (12)

• The hierarchical formation of the brightest cluster galaxies
• The Role of Pressure in GMC Formation II: The H_2 - Pressure Relation
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• On the (Non)Evolution of HI Disks over Cosmic Time
• The ATLAS3D Project - XXVIII. Dynamically-driven star formation suppression in early-type galaxies
• The HI content of star-forming galaxies at z = 0.24
• The Atomic to Molecular Transition and its Relation to the Scaling Properties of Galaxy Disks in the Local Universe
• Monte Carlo Markov Chain Parameter Estimation in Semi-Analytic Models of Galaxy Formation
• MeerKAT Key Project Science, Specifications, and Proposals
• Cosmological constraints from the CFHTLenS shear measurements using a new, accurate and flexible way of predicting nonlinear mass clustering
• Monolithic or hierarchical star formation? A new statistical analysis
• Building a Predictive Model of Galaxy Formation - I: Phenomenological Model Constrained to the $z=0$ Stellar Mass Function

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• Constraints on the evolution of the relationship between HI mass and halo mass in the last 12 Gyr
• Cosmic metal density evolution in neutral gas: insights from observations and cosmological simulations
• Efficient exploration and calibration of a semi-analytical model of galaxy formation with deep learning
• The Qz5 Survey (I): How the HI Mass Density of the Universe Evolves With Cosmic Time
• Sensitivity analysis of a galaxy formation model
• Ultra-fast model emulation with PRISM; analyzing the Meraxes galaxy formation model