Benjamin P. Moster
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View article: The connection between mergers and AGN activity in simulated and observed massive galaxies
The connection between mergers and AGN activity in simulated and observed massive galaxies Open
We analyse a suite of 29 high-resolution zoom-in cosmological hydrodynamic simulations of massive galaxies with stellar masses $M_{\rm star} \gt 10^{10.9} \, \mathrm{M}_\odot$, with the goal of better understanding merger activity among ac…
View article: Predictions on the stellar-to-halo mass relation in the dwarf regime using the empirical model for galaxy formation <scp>Emerge</scp>
Predictions on the stellar-to-halo mass relation in the dwarf regime using the empirical model for galaxy formation <span>Emerge</span> Open
One of the primary goals when studying galaxy formation is to understand how the luminous component of the Universe, galaxies, relate to the growth of structure which is dominated by the gravitational collapse of dark matter haloes. The st…
View article: Observational measures of halo properties beyond mass
Observational measures of halo properties beyond mass Open
Different properties of dark matter haloes, including growth rate, concentration, interaction history, and spin, correlate with environment in unique, scale-dependent ways. While these halo properties are not directly observable, galaxies …
View article: Globular cluster numbers in dark matter haloes in a dual formation scenario: an empirical model within <scp>emerge</scp>
Globular cluster numbers in dark matter haloes in a dual formation scenario: an empirical model within <span>emerge</span> Open
We present an empirical model for the number of globular clusters (GCs) in galaxies based on recent data showing a tight relationship between dark matter halo virial masses and GC numbers. While a simple base model forming GCs in low-mass …
View article: GalaxyNet: connecting galaxies and dark matter haloes with deep neural networks and reinforcement learning in large volumes
GalaxyNet: connecting galaxies and dark matter haloes with deep neural networks and reinforcement learning in large volumes Open
We present the novel wide and deep neural network GalaxyNet, which connects the properties of galaxies and dark matter haloes and is directly trained on observed galaxy statistics using reinforcement learning. The most important halo prope…
View article: <scp>emerge</scp>: constraining merging probabilities and time-scales of close galaxy pairs
<span>emerge</span>: constraining merging probabilities and time-scales of close galaxy pairs Open
Theoretical models are vital for exploring the galaxy merger process, which plays a crucial role in the evolution of galaxies. Recent advances in modelling have placed tight constraints on the build-up of stellar material in galaxies acros…
View article: The Connection between Mergers and AGN Activity in Simulated and Observed Massive Galaxies
The Connection between Mergers and AGN Activity in Simulated and Observed Massive Galaxies Open
We analyze a suite of $30$ high resolution zoom-in cosmological hydrodynamic simulations of massive galaxies with stellar masses $M_{\ast} > 10^{10.9} M_\odot$, with the goal of better understanding merger activity in AGN, AGN activity in …
View article: Globular cluster numbers in dark matter haloes: an empirical model within EMERGE
Globular cluster numbers in dark matter haloes: an empirical model within EMERGE Open
We present an empirical model for the number of globular clusters (GCs) in galaxies based on recent data showing a tight relationship between dark matter halo virial masses and GC numbers. Based on these relations, our model forms GCs in h…
View article: <scp>Emerge</scp>: Empirical predictions of galaxy merger rates since <i>z</i> ∼ 6
<span>Emerge</span>: Empirical predictions of galaxy merger rates since <i>z</i> ∼ 6 Open
We explore the galaxy-galaxy merger rate with the empirical model for galaxy formation, emerge. On average, we find that between 2 per cent and 20 per cent of massive galaxies (log10(m*/M⊙) ≥ 10.3) will experience a major merger per Gyr. O…
View article: The Universe at <i>z</i> &gt; 10: predictions for <i>JWST</i> from the <scp>universemachine</scp> DR1
The Universe at <i>z</i> > 10: predictions for <i>JWST</i> from the <span>universemachine</span> DR1 Open
The James Webb Space Telescope (JWST) is expected to observe galaxies at z > 10 that are presently inaccessible. Here, we use a self-consistent empirical model, the universemachine, to generate mock galaxy catalogues and light-cones ove…
View article: emerge – empirical constraints on the formation of passive galaxies
emerge – empirical constraints on the formation of passive galaxies Open
We present constraints on the emergence and evolution of passive galaxies with the empirical model emerge, which reproduces the evolution of stellar mass functions (SMFs), specific and cosmic star formation rates since $z$ ≈ 10, ‘quenched’…
View article: On the origin of magnetic driven winds and the structure of the galactic dynamo in isolated galaxies
On the origin of magnetic driven winds and the structure of the galactic dynamo in isolated galaxies Open
We investigate the build-up of the galactic dynamo and subsequently the origin of a magnetic driven outflow. We use a set-up of an isolated disc galaxy with a realistic circum-galactic medium (CGM). We find good agreement of the galactic d…
View article: Probing black hole accretion tracks, scaling relations, and radiative efficiencies from stacked X-ray active galactic nuclei
Probing black hole accretion tracks, scaling relations, and radiative efficiencies from stacked X-ray active galactic nuclei Open
The masses of supermassive black holes at the centres of local galaxies appear to be tightly correlated with the mass and velocity dispersions of their galactic hosts. However, the local Mbh–Mstar relation inferred from dynamically measure…
View article: Predicting fully self-consistent satellite richness, galaxy growth and starformation rates from the STastical sEmi-Empirical modeL steel.
Predicting fully self-consistent satellite richness, galaxy growth and starformation rates from the STastical sEmi-Empirical modeL steel. Open
Observational systematics complicate comparisons with theoretical models limiting understanding of galaxy evolution. In particular, different empirical determinations of the stellar mass function imply distinct mappings between the galaxy …
View article: Local photoionization feedback effects on galaxies
Local photoionization feedback effects on galaxies Open
We implement an optically thin approximation for the effects of the local radiation field from stars and hot gas on the gas heating and cooling in the N-body smoothed particle hydrodynamics code gasoline2. We resimulate three galaxies from…
View article: Clustering constraints on the relative sizes of central and satellite galaxies
Clustering constraints on the relative sizes of central and satellite galaxies Open
We empirically constrain how galaxy size relates to halo virial radius using new measurements of the size- and stellar mass-dependent clustering of galaxies in the Sloan Digital Sky Survey. We find that small galaxies cluster much more str…
View article: NIHAO XVI: the properties and evolution of kinematically selected discs, bulges, and stellar haloes
NIHAO XVI: the properties and evolution of kinematically selected discs, bulges, and stellar haloes Open
We use 25 simulated galaxies from the NIHAO project to define and characterize a variety of kinematic stellar structures: thin and thick discs, large scale single discs, classical and pseudo bulges, spheroids, inner discs, and stellar halo…
View article: The outer stellar halos of galaxies: how radial merger mass deposition, shells, and streams depend on infall-orbit configurations
The outer stellar halos of galaxies: how radial merger mass deposition, shells, and streams depend on infall-orbit configurations Open
Galaxy mergers are a fundamental part of galaxy evolution. To study the\nresulting mass distributions of different kinds of galaxy mergers, we present a\nsimulation suite of 36 high-resolution isolated merger simulations, exploring a\nwide…
View article: Astro2020: Empirically Constraining Galaxy Evolution
Astro2020: Empirically Constraining Galaxy Evolution Open
Over the past decade, empirical constraints on the galaxy-dark matter halo connection have significantly advanced our understanding of galaxy evolution. Past techniques have focused on connections between halo properties and galaxy stellar…
View article: Magnetic buoyancy in simulated galactic discs with a realistic circumgalactic medium
Magnetic buoyancy in simulated galactic discs with a realistic circumgalactic medium Open
We present simulations of isolated disc galaxies in a realistic environment\nperformed with the Tree-SPMHD-Code Gadget-3. Our simulations include a\nspherical circum-galactic medium (CGM) surrounding the galactic disc, motivated\nby observ…
View article: Outer Stellar Halo Enrichment: where Mergers deposit their Mass and how Shells and Streams depend on Infall-Orbit Configurations
Outer Stellar Halo Enrichment: where Mergers deposit their Mass and how Shells and Streams depend on Infall-Orbit Configurations Open
Galaxy mergers are a fundamental part of galaxy evolution. To study the resulting mass distributions of different kind of galaxy mergers, we present a simulation suite of 36 high-resolution isolated merger simulations, exploring a wide ran…
View article: Introducing galactic structure finder: the multiple stellar kinematic structures of a simulated Milky Way mass galaxy
Introducing galactic structure finder: the multiple stellar kinematic structures of a simulated Milky Way mass galaxy Open
We present the first results of applying Gaussian Mixture Models in the stellar kinematic space of normalized angular momentum and binding energy on NIHAO high resolution galaxies to separate the stars into multiple components. We exemplif…
View article: emerge – an empirical model for the formation of galaxies since z ∼ 10
emerge – an empirical model for the formation of galaxies since z ∼ 10 Open
We present EMERGE, an Empirical ModEl for the foRmation of GalaxiEs,\ndescribing the evolution of individual galaxies in large volumes from $z\\sim10$\nto the present day. We assign a star formation rate to each dark matter halo\nbased on …
View article: Recoiling supermassive black hole escape velocities from dark matter haloes
Recoiling supermassive black hole escape velocities from dark matter haloes Open
We simulate recoiling black hole trajectories from $z=20$ to $z=0$ in dark\nmatter halos, quantifying how parameter choices affect escape velocities. These\nchoices include the strength of dynamical friction, the presence of stars and\ngas…
View article: The origin and evolution of fast and slow rotators in the Illustris simulation
The origin and evolution of fast and slow rotators in the Illustris simulation Open
Using the Illustris simulation, we follow thousands of elliptical galaxies back in time to identify how the dichotomy between fast and slow rotating ellipticals (FRs and SRs) develops. Comparing to the $\textrm{ATLAS}^\textrm{3D}$ survey, …