Simon J. Mutch

Constraining the last 7 billion years of galaxy evolution in semi-analytic models

We investigate the ability of the Croton et al. (2006) semi-analytic model to reproduce the evolution of observed galaxies across the final 7 billion years of cosmic history. Using Monte-Carlo Markov Chain techniques we explore the available parameter space to produce a model which attempts to achieve a statistically accurate fit to the observed stellar mass function at z=0 and z~0.8, as well as the local black hole-bulge relation. We find that in order to be successful we are required to push supernova feedback efficiencies to extreme limits which are, in some cases, unjustified by current observations. This leads us to the conclusion that the current model may be incomplete. Using the posterior probability distributions provided by our fitting, as well as the qualitative details of our produced stellar mass functions, we suggest that any future model improvements must act to preferentially bolster star formation efficiency in the most massive halos at high redshift.

Dark-ages reionization and galaxy formation simulation – IV. UV luminosity functions of high-redshift galaxies

In this paper we present calculations of the UV luminosity function from the Dark-ages Reionization And Galaxy-formation Observables from Numerical Simulations (DRAGONS) project, which combines N-body, semi-analytic and semi-numerical modelling designed to study galaxy formation during the Epoch of Reionization. Using galaxy formation physics including supernova feedback, the model naturally reproduces the UV LFs for high-redshift star-forming galaxies from

The Host Galaxies of X-Ray Selected Active Galactic Nuclei to z - 2.5: Structure, Star-Formation and Their Relationships from CANDELS and Herschel/Pacs

z{\sim}5

The Theoretical Astrophysical Observatory: Cloud-based Mock Galaxy Catalogs

through to

Building disc structure and galaxy properties through angular momentum: The DARK SAGE semi-analytic model

z{\sim}10

The Gigaparsec WiggleZ simulations: characterizing scale-dependant bias and associated systematics in growth of structure measurements

. We investigate the luminosity--star formation rate (SFR) relation, finding that variable SFR histories of galaxies result in a scatter around the median relation of

Dark-ages Reionization and Galaxy Formation Simulation II: Spin and concentration parameters for dark matter haloes during the Epoch of Reionization

0.1

The growth of discs and bulges during hierarchical galaxy formation – I. Fast evolution versus secular processes

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Dark-ages reionization and galaxy formation simulation – X. The small contribution of quasars to reionization

0.3

Dark-ages reionization and galaxy formation simulation V: morphology and statistical signatures of reionization

dex depending on UV luminosity. We find close agreement between the model and observationally derived SFR functions. We use our calculated luminosities to investigate the luminosity function below current detection limits, and the ionizing photon budget for reionization. We predict that the slope of the UV LF remains steep below current detection limits and becomes flat at