Publications (144)
Hidden from view: Coupled Dark Sector Physics and Small Scales
Pascal J. Elahi, Geraint F. Lewis, Chris Power +2
We study cluster mass dark matter haloes, their progenitors and surroundings in an coupled Dark Matter-Dark Energy model and compare it to quintessence and CDM models with adia…
An orbital perspective on the starvation, stripping, and quenching of satellite galaxies in the EAGLE simulations
Ruby J. Wright, Claudia del P. Lagos, Chris Power +3
Using the EAGLE suite of simulations, we demonstrate that both cold gas stripping {\it and} starvation of gas inflow play an important role in quenching satellite galaxies across a…
Cosmic CARNage II: the evolution of the galaxy stellar mass function in observations and galaxy formation models
Rachel Asquith, Frazer R. Pearce, Omar Almaini +24
We present a comparison of the observed evolving galaxy stellar mass functions with the predictions of eight semi-analytic models and one halo occupation distribution model. While…
CosmoDRAGoN III: Shaping the Afterlife -- How Progenitors and Environments Sculpt Radio Galaxy Remnants
Georgia S. C. Stewart, Stanislav S. Shabala, Patrick M. Yates-Jones +6
Identifying remnant radio-loud active galactic nuclei (AGNs) is challenging due to their diverse morphological and spectral characteristics. Using three-dimensional hydrodynamic si…
Cosmic CARNage I: on the calibration of galaxy formation models
Alexander Knebe, Frazer R. Pearce, Violeta Gonzalez-Perez +31
We present a comparison of nine galaxy formation models, eight semi-analytical and one halo occupation distribution model, run on the same underlying cold dark matter simulation (c…
HALOGEN: A tool for fast generation of mock halo catalogues
Santiago Avila, Steven G. Murray, Alexander Knebe +3
We present a simple method of generating approximate synthetic halo catalogues: HALOGEN. This method uses a combination of -order Lagrangian Perturbation Theory (2LPT) in o…
Shark: introducing an open source, free and flexible semi-analytic model of galaxy formation
Claudia del P. Lagos, Rodrigo J. Tobar, Aaron S. G. Robotham +4
We present a new, open source, free semi-analytic model (SAM) of galaxy formation, Shark, designed to be highly flexible and modular, allowing easy exploration of different physica…
HMFcalc: An Online Tool for Calculating Dark Matter Halo Mass Functions
Steven Murray, Chris Power, Aaron Robotham
The dark matter halo mass function (HMF) is a characteristic property of cosmological structure formation models, quantifying the number density of dark matter haloes per unit mass…
How Concentrated Are The Haloes Of Low Surface Brightness Galaxies In The Cold Dark Matter Model?
Jeremy Bailin, Chris Power, Brad K. Gibson +1
We investigate whether a correlation exists between the concentration and spin parameters of dark matter haloes forming in LCDM N-body simulations. In particular, we focus on haloe…
Major mergers between dark matter haloes -- I. Predictions for size, shape, and spin
Nicole E. Drakos, James E. Taylor, Anael Berrouet +2
The structural properties of individual dark matter haloes, including shape, spin, concentration, and substructure, are linked to the halo's growth history, but the exact connectio…
Matter in the beam: Weak lensing, substructures and the temperature of dark matter
Hareth S. Mahdi, Pascal J. Elahi, Geraint F. Lewis +1
Warm Dark Matter (WDM) models offer an attractive alternative to the current Cold Dark Matter (CDM) cosmological model. We present a novel method to differentiate between WDM and C…
Hunting for Galaxies and Halos in simulations with VELOCIraptor
Pascal J. Elahi, Rodrigo Cañas, Rhys J. J. Poulton +5
We present VELOCIraptor, a massively parallel galaxy/(sub)halo finder that is also capable of robustly identifying tidally disrupted objects and separate stellar halos from galaxie…
Extended Stellar Components of Galaxies & the Nature of Dark Matter
Chris Power, Aaron S. G. Robotham
Deep observations of galaxies reveal faint extended stellar components (hereafter ESCs) of streams, shells, and halos. These are a natural prediction of hierarchical galaxy formati…
Stability of Satellite Planes in M31 II: Effects of the Dark Subhalo Population
Nuwanthika Fernando, Veronica Arias, Geraint F. Lewis +2
The planar arrangement of nearly half the satellite galaxies of M31 has been a source of mystery and speculation since it was discovered. With a growing number of other host galaxi…
A correlation between spin parameter and dark matter halo mass
Alexander Knebe, Chris Power
Using a set of high-resolution dark matter only cosmological simulations we found a correlation between the dark matter halo mass M and its spin parameter lambda for objects formin…
Thermal and Reionisation History within a Large-Volume Semi-Analytic Galaxy Formation Simulation
Sreedhar Balu, Bradley Greig, Yisheng Qiu +4
We predict the 21-cm global signal and power spectra during the Epoch of Reionisation using the MERAXES semi-analytic galaxy formation and reionisation model, updated to include X-…
The Three Hundred project: shapes and radial alignment of satellite, infalling, and backsplash galaxies
Alexander Knebe, Matias Gamez-Marin, Frazer R. Pearce +6
Using 324 numerically modelled galaxy clusters we investigate the radial and galaxy-halo alignment of dark matter subhaloes and satellite galaxies orbiting within and around them.…
Confronting Cold Dark Matter Predictions with Observed Galaxy Rotations
Danail Obreschkow, Xiangcheng Ma, Martin Meyer +4
The rich statistics of galaxy rotations as captured by the velocity function (VF) provides invaluable constraints on galactic baryon physics and the nature of dark matter (DM). How…
Modelling supermassive black hole growth: towards an improved sub-grid prescription
Alexander Hobbs, Chris Power, Sergei Nayakshin +1
Accretion onto supermassive black holes (SMBHs) in galaxy formation simulations is frequently modelled by the Bondi-Hoyle formalism. Here we examine the validity of this approach a…
Spurious Small-Scale Structure & Discreteness-Driven Relaxation in Cosmological Simulations
Chris Power, Aaron S. G. Robotham, Danail Obreschkow +2
There is strong evidence that cosmological N-body simulations dominated by Warm Dark Matter (WDM) contain spurious or unphysical haloes, most readily apparent as regularly spaced l…
Simulating feedback from nuclear clusters: the impact of multiple sources
Martin A. Bourne, Chris Power
Nuclear star clusters (NCs) are found to exist in the centres of many galaxies and appear to follow scaling relations similar to those of super-massive black holes. Previous analyt…
On the relation between radial alignment of dark matter subhalos and host mass in cosmological simulations
Alexander Knebe, Nadya Draganova, Chris Power +4
We explore the dependence of the radial alignment of subhalos on the mass of the host halo they orbit in. As the effect is seen on a broad range of scales including massive cluster…
Unveiling the population of massive quenched galaxies at in the COLIBRE simulations -- I. Galaxy demographics
Ãngel Chandro-Gómez, Claudia del P. Lagos, Chris Power +14
JWST has uncovered a substantial population of Massive (), Quenched Galaxies (MQGs) in the early Universe (), whose prop…
The Three Hundred Project: The evolution of galaxy cluster density profiles
Robert Mostoghiu, Alexander Knebe, Weiguang Cui +5
Recent numerical studies of the dark matter density profiles of massive galaxy clusters (M) show that their median radial mass density profile rem…
The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications
Weiguang Cui, Alexander Knebe, Gustavo Yepes +34
We introduce the THE THREE HUNDRED project, an endeavour to model 324 large galaxy clusters with full-physics hydrodynamical re-simulations. Here we present the data set and study…
The Impact of Realistic Foreground and Instrument Models on 21cm Epoch of Reionization Experiments
Ainulnabilah Nasirudin, Steven Murray, Cathryn Trott +3
Predictions for the ability of 21-cm interferometric experiments to discriminate Epoch of Reionization (EoR) signal models are typically limited by the simplicity of data models, w…
Reliable mass calculation in spherical gravitating systems
Foivos I. Diakogiannis, Geraint F. Lewis, Rodrigo A. Ibata +3
We present an innovative approach to the methodology of dynamical modelling, allowing practical reconstruction of the underlying dark matter mass without assuming both the density…
The Dynamical State of Dark Matter Haloes in Cosmological Simulations I: Correlations with Mass Assembly History
Chris Power, Alexander Knebe, Steffen R. Knollmann
Using a statistical sample of dark matter haloes drawn from a suite of cosmological N-body simulations of the Cold Dark Matter (CDM) model, we quantify the impact of a simulated ha…
Quenching timescales of galaxies in the EAGLE simulations
Ruby J. Wright, Claudia del P. Lagos, Luke J. M. Davies +3
We use the \eagle\ simulations to study the connection between the quenching timescale, , and the physical mechanisms that transform star-forming galaxies into passive…
Feeding SMBHs through supersonic turbulence and ballistic accretion
Alexander Hobbs, Sergei Nayakshin, Chris Power +1
It has long been recognised that the main obstacle to accretion of gas onto supermassive black holes (SMBHs) is large specific angular momentum. It is feared that the gas settles i…
On the relationship between gas content, star-formation, and global HI asymmetry of galaxies on the star-forming main-sequence
Adam B. Watts, Barbara Catinella, Luca Cortese +2
Observations have revealed that disturbances in the cold neutral atomic hydrogen (HI) in galaxies are ubiquitous, but the reasons for these disturbances remain unclear. While some…
Unveiling the atomic hydrogen-halo mass relation via spectral stacking
Garima Chauhan, Claudia del P. Lagos, Adam R. H. Stevens +5
Measuring the HI-halo mass scaling relation (HIHM) is fundamental to understanding the role of HI in galaxy formation and its connection to structure formation. While direct measur…
The Accretion Disc Particle Method for Simulations of Black Hole Feeding and Feedback
Chris Power, Sergei Nayakshin, Andrew King
Black holes grow by accreting matter from their surroundings. However, angular momentum provides an efficient natural barrier to accretion and so only the lowest angular momentum m…
Warm Dark Haloes Accretion Histories and their Gravitational Signatures
Pascal J. Elahi, Hareth S. Mahdi, Chris Power +1
We study clusters in Warm Dark Matter (WDM) models of a thermally produced dark matter particle keV in mass. We show that, despite clusters in WDM cosmologies having similar…
Seeking Observable Imprints of Small-Scale Structure on the Properties of Dark Matter Haloes
Chris Power
The characteristic prediction of the Cold Dark Matter (CDM) model of cosmological structure formation is that the Universe should contain a wealth of small-scale structure -- low-m…
A stochastic model to reproduce the star-formation history of individual galaxies in hydrodynamic simulations
Yang Wang, Nicola R. Napolitano, Weiguang Cui +7
The star formation history (SFH) of galaxies is critical for understanding galaxy evolution. Hydrodynamical simulations enable us to precisely reconstruct the SFH of galaxies and e…
nIFTy Cosmology: Galaxy/halo mock catalogue comparison project on clustering statistics
Chia-Hsun Chuang, Cheng Zhao, Francisco Prada +21
We present a comparison of major methodologies of fast generating mock halo or galaxy catalogues. The comparison is done for two-point and the three-point clustering statistics. Th…
Observing Merger Trees in a New Light
Rhys J. J. Poulton, Aaron S. G. Robotham, Chris Power +1
Merger trees harvested from cosmological -body simulations encode the assembly histories of dark matter halos over cosmic time, and are a fundamental component of semi-analytica…
BRAiSE: synthetic polarisation in RMHD AGN jet simulations
Larissa Jerrim, Stas Shabala, Patrick Yates-Jones +4
We present a new method to calculate the polarised synchrotron emission of radio AGN sources using magnetic field information from 3-dimensional relativistic magnetohydrodynamical…
The Anisotropic Distribution of Satellite Galaxies
Jeremy Bailin, Chris Power, Peder Norberg +2
We identify satellites of isolated galaxies in SDSS and examine their angular distribution. Using mock catalogues generated from cosmological N-body simulations, we demonstrate tha…
From the far-ultraviolet to the far-infrared -- galaxy emission at in the Shark semi-analytic model
Claudia del P. Lagos, Aaron S. G. Robotham, James W. Trayford +8
We combine the Shark semi-analytic model of galaxy formation with the ProSpect software tool for spectral energy distribution (SED) generation to study the multi-wavelength emissio…
Using Velocity Dispersion to Estimate Halo Mass: Is the Local Group in Tension with CDM?
Pascal J. Elahi, Chris Power, Claudia del P. Lagos +2
Satellite galaxies are commonly used as tracers to measure the line-of-sight velocity dispersion () of the dark matter halo associated with their central galaxy, and…
Predicting the Scaling Relations between the Dark Matter Halo Mass and Observables from Generalised Profiles II: Intracluster Gas Emission
Andrew Sullivan, Chris Power, Connor Bottrell +2
We investigate the connection between a cluster's structural configuration and observable measures of its gas emission that can be obtained in X-ray and Sunyaev-Zeldovich (SZ) surv…
Global HI asymmetries in IllustrisTNG: a diversity of physical processes disturb the cold gas in galaxies
Adam B. Watts, Chris Power, Barbara Catinella +2
Observations of the cold neutral atomic hydrogen (HI) in and around disc galaxies have revealed that spatial and kinematic asymmetries are commonplace, and are reflected in the glo…
Novel Adaptive softening for collisionless N-body simulations: Eliminating spurious halos
Alexander Hobbs, Justin Read, Oscar Agertz +2
We describe a NOVel form of Adaptive softening (NovA) for collisionless -body simulations, implemented in the Ramses adaptive mesh refinement code. We introduce a refinement cri…
The Dynamics of Subhalos in Warm Dark Matter Models
Alexander Knebe, Bastian Arnold, Chris Power +1
We present a comparison of the properties of substructure halos (subhalos) orbiting within host halos that form in Cold Dark Matter (CDM) and Warm Dark Matter (WDM) cosmologies. Ou…
Stochastic Star Formation & Feedback: Mapping Low-Mass Galaxies to Dark Matter Haloes
Chris Power, Graham A. Wynn, Aaron S. G. Robotham +2
Comparison of observed satellite galaxies of the Milky Way (hereafter MW) with dark matter subhaloes in cosmological -body simulations of MW-mass haloes suggest that such subhal…
Cosmic Voids in Evolving Dark Sector Cosmologies: the High Redshift Universe
Eromanga Adermann, Pascal J Elahi, Geraint F Lewis +1
We compare the evolution of voids formed under the standard cosmological model and two alternative cosmological models. The two models are a quintessence model (CDM) and a Coup…
Galaxy Groups: Proceedings from a Swinburne University Workshop
Virginia A. Kilborn, Kenji Bekki, Sarah Brough +6
We present the proceedings from a 2-day workshop held at Swinburne University on the 24th-25th of May 2005. The workshop participants highlighted current Australian research on bot…
Constraining cosmological parameters using the splashback radius of galaxy clusters
Roan Haggar, Yuba Amoura, Charlie T. Mpetha +3
Cosmological parameters such as and can be measured indirectly using various methods, including galaxy cluster abundance and cosmic shear. These measurements…
From Stellar Halos to Intracluster Light: the physics of the Intra-Halo Stellar Component in cosmological hydrodynamical simulations
Rodrigo Cañas, Claudia del P. Lagos, Pascal J. Elahi +4
We study the Intra-Halo Stellar Component (IHSC) of Milky Way-mass systems up to galaxy clusters in the Horizon-AGN cosmological hydrodynamical simulation. We identify the IHSC usi…
nIFTy galaxy cluster simulations I: dark matter & non-radiative models
Federico Sembolini, Gustavo Yepes, Frazer R. Pearce +24
We have simulated the formation of a galaxy cluster in a CDM universe using twelve different codes modeling only gravity and non-radiative hydrodynamics (\art, \arepo, \hydra\…
How well do we know the Halo Mass Function?
Steven Murray, Chris Power, Aaron Robotham
The parameters governing the standard ÎCold Dark Matter cosmological model have been constrained with unprecedented accuracy by precise measurements of the cosmic microwave backgr…
The Three Hundred Project: Ram pressure and gas content of haloes and subhaloes in the phase-space plane
Jake Arthur, Frazer R. Pearce, Meghan E. Gray +12
We use TheThreeHundred project, a suite of 324 resimulated massive galaxy clusters embedded in a broad range of environments, to investigate (i) how the gas content of surrounding…
Thermal instabilities in cooling galactic coronae: fuelling star formation in galactic discs
Alexander Hobbs, Justin Read, Chris Power +1
We investigate the means by which cold gas can accrete onto Milky Way mass galaxies from a hot corona of gas, using a new smoothed particle hydrodynamics code, 'SPHS'. We find that…
Tidal adaptive softening and artificial fragmentation in cosmological simulations
Robert A. Mostoghiu Paun, Darren Croton, Chris Power +3
Traditional N-body methods introduce localised perturbations in the gravitational forces governing their evolution. These perturbations lead to an artificial fragmentation in the f…
Dynamics of substructures in warm dark-matter cosmologies
Bastian Arnold, Alexander Knebe, Chris Power +1
We performed cosmological simulations based upon both a cold dark matter (CDM) and a warm dark matter (WDM) model. The focus of our investigations lies with selected spatial and ki…
The impact of stellar and AGN feedback on halo-scale baryonic and dark matter accretion in the EAGLE simulations
Ruby J. Wright, Claudia del P. Lagos, Chris Power +1
We use the EAGLE suite of hydrodynamical simulations to analyse accretion rates (and the breakdown of their constituent channels) onto haloes over cosmic time, comparing the behavi…
How does our choice of observable influence our estimation of the centre of a galaxy cluster? Insights from cosmological simulations
Weiguang Cui, Chris Power, Veronica Biffi +6
Galaxy clusters are an established and powerful test-bed for theories of both galaxy evolution and cosmology. Accurate interpretation of cluster observations often requires robust…
nIFTy galaxy cluster simulations V: Investigation of the Cluster Infall Region
Jake Arthur, Frazer R. Pearce, Meghan E. Gray +19
We examine the properties of the galaxies and dark matter haloes residing in the cluster infall region surrounding the simulated CDM galaxy cluster studied by Elahi et al. (201…
nIFTY galaxy cluster simulations III: The Similarity & Diversity of Galaxies & Subhaloes
Pascal J. Elahi, Alexander Knebe, Frazer R. Pearce +17
We examine subhaloes and galaxies residing in a simulated LCDM galaxy cluster () produced by hydrodynamical codes ranging from classic…
Disk Galaxy Rotation Curves in Triaxial CDM Halos
E. Hayashi, J. F. Navarro, A. Jenkins +7
We use N-body hydrodynamical simulations to study the structure of disks in triaxial potentials resembling CDM halos. Our analysis focuses on the accuracy of the dark mass distribu…
The observed relations imply that SMBHs grow by cold chaotic accretion
Sergei Nayakshin, Chris Power, Andrew R. King
We argue that current observations of relations for galaxies can be used to constrain theories of super-massive black holes (SMBH) feeding. In particular, assuming that SM…
Climbing Halo Merger Trees with TreeFrog
Pascal J. Elahi, Rhys J. J. Poulton, Rodrigo J. Tobar +4
We present TreeFrog, a massively parallel halo merger tree builder that is capable comparing different halo catalogues and producing halo merger trees. The code is written in c++11…
The Tidal Streams of Disrupting Subhaloes in Cosmological Dark Matter Haloes
Kristin Warnick, Alexander Knebe, Chris Power
(abridged) We present a detailed analysis of the properties of tidally stripped material from disrupting substructure haloes or subhaloes in a sample of high resolution cosmologica…
Cosmic evolution of the atomic and molecular gas content of galaxies
Claudia del P. Lagos, Carlton M. Baugh, Cedric G. Lacey +3
We study the evolution of the cold gas content of galaxies by splitting the interstellar medium into its atomic and molecular hydrogen components, using the galaxy formation model…
The Distribution of Satellite Galaxies: The Great Pancake
Noam I Libeskind, Carlos S Frenk, Shaun Cole +4
The 11 known satellite galaxies within 250 kpc of the Milky Way lie close to a great circle on the sky. We use high resolution N-body simulations of galactic dark matter halos to t…
Feedback from High-Mass X-Ray Binaries on the High Redshift Intergalactic Medium : Model Spectra
Chris Power, Gillian F. James, Celine Combet +1
Massive stars at redshifts z > 6 are predicted to have played a pivotal role in cosmological reionization as luminous sources of ultra-violet (UV) photons. However, the remnants of…
The Three Hundred Project: The influence of environment on simulated galaxy properties
Yang Wang, Frazer R. Pearce, Alexander Knebe +8
The relationship between galaxy properties and environment is a widely discussed topic within astrophysics. Here we use galaxy samples from hydrodynamical re-simulations to examine…
The Wide Area VISTA Extra-galactic Survey (WAVES)
Simon P. Driver, Luke J. Davies, Martin Meyer +5
The "Wide Area VISTA Extra-galactic Survey" (WAVES) is a 4MOST Consortium Design Reference Survey which will use the VISTA/4MOST facility to spectroscopically survey ~2million gala…
Are Odd Radio Circles phoenixes of powerful radio galaxies?
Stanislav Shabala, Patrick Yates-Jones, Larissa Jerrim +8
Odd Radio Circles (ORCs) are a class of low surface brightness, circular objects approximately one arcminute in diameter. ORCs were recently discovered in the Australian Square Kil…
Major mergers between dark matter haloes -- II. Profile and concentration changes
Nicole E. Drakos, James E. Taylor, Anael Berrouet +2
Several lines of evidence suggest that as dark matter haloes grow their scale radius increases, and that the density in their central region drops. Major mergers seem an obvious me…
Cosmological Galaxy Formation Modelling in the Era of the Square Kilometre Array
Claudia del P. Lagos, Carlton M. Baugh, Connor Bottrell +11
Over the past decade, galaxy formation simulations have advanced dramatically, transforming our ability to model the interstellar medium (ISM) and predict galaxies' radio emission.…
Faraday rotation as a probe of radio galaxy environment in RMHD AGN jet simulations
Larissa A. Jerrim, Stanislav S. Shabala, Patrick M. Yates-Jones +6
Active galactic nuclei (AGN) play an integral role in galaxy formation and evolution by influencing galaxies and their environments through radio jet feedback. Historically, interp…
CosmoDRAGoN II: Remnant Radio Galaxies in Group and Cluster Environments
Georgia S. C. Stewart, Stanislav S. Shabala, Ross J. Turner +5
Radio galaxy remnants are a rare subset of the radio-loud active galactic nuclei (RLAGN) population, representing the quiescent phase in the RLAGN lifecycle. Despite their observed…
On the accuracy of dark matter halo merger trees and the consequences for semi-analytic models of galaxy formation
Ãngel Chandro-Gómez, Claudia del P. Lagos, Chris Power +6
Galaxy formation and evolution models, such as semi-analytic models, are powerful theoretical tools for predicting how galaxies evolve across cosmic time. These models follow the e…
xGASS: Robust quantification of asymmetries in global HI spectra and their relationship to environmental processes
Adam B. Watts, Barbara Catinella, Luca Cortese +1
We present an analysis of asymmetries in global HI spectra from the extended GALEX Arecibo SDSS Survey (xGASS), a stellar mass-selected and gas fraction-limited survey which is rep…
Halo mass functions at high redshift
Hannah O'Brennan, John A. Regan, Chris Power +3
Recent JWST observations of very early galaxies, at , have led to claims that tension exists between the sizes and luminosities of high-redshift galaxies and wha…
Caught in the rhythm II: Competitive alignments of satellites with their inner halo and central galaxy
Charlotte Welker, Chris Power, Christophe Pichon +3
The anisotropic distribution of satellites around the central galaxy of their host halo is well-documented. However the relative impact of baryons and dark matter in shaping this d…
The distribution and properties of DLAs at z 2 in the EAGLE simulations
Lilian Garratt-Smithson, Chris Power, Claudia del P. Lagos +3
Determining the spatial distribution and intrinsic physical properties of neutral hydrogen on cosmological scales is one of the key goals of next-generation radio surveys. We use t…
The Three Hundred Project: deducing the stellar splashback structure of galaxy clusters from their orbiting profiles
Kris Walker, Aaron Ludlow, Chris Power +2
We examine the splashback structure of galaxy clusters using hydrodynamical simulations from the GIZMO run of The Three Hundred Project, focusing on the relationship between the st…
Quenching massive galaxies across cosmic time with the semi-analytic model SHARK v2.0
Claudia D. P. Lagos, Matias Bravo, Rodrigo Tobar +7
We introduce version 2.0 of the SHARK semi-analytic model of galaxy formation after many improvements to the physics included. The most significant being: (i) a model describing th…
Using dust to constrain dark matter models
Adam Ussing, Robert Mostoghiu Paun, Darren Croton +3
In this paper, we use hydrodynamic zoom-in simulations of Milky Way-type haloes to explore using dust as an observational tracer to discriminate between cold and warm dark matter (…
An Empirical Mass Function Distribution
Steven G. Murray, Aaron S. G. Robotham, Chris Power
The halo mass function, encoding the comoving number density of dark matter halos of a given mass, plays a key role in understanding the formation and evolution of galaxies. As suc…
The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today
Sreedhar Balu, Chris Power, Kris Walker +1
Where in the present-day Milky Way should we search for the remnants of its earliest stars? We address this question using the DORCHA (Gaelic for Dark; DUR-uh-khuh) suite: a set of…
Galaxy and Mass Assembly (GAMA): Formation and Growth of Elliptical Galaxies in the Group Environment
Simon Deeley, Michael J. Drinkwater, Daniel Cunnama +16
There are many proposed mechanisms driving the morphological transformation of disk galaxies to elliptical galaxies. In this paper, we determine if the observed transformation in l…
The Accuracy of Subhalo Detection
Stuart I. Muldrew, Frazer R. Pearce, Chris Power
With the ever increasing resolution of N-body simulations, accurate subhalo detection is becoming essential in the study of the formation of structure, the production of merger tre…
What can the outskirts of galaxies tell us about dark matter?
Chris Power
Deep observations of galaxy outskirts reveal faint extended stellar components (ESCs) of streams, shells, and halos, which are ghostly remnants of the tidal disruption of satellite…
Reconsidering the dynamical states of galaxy clusters using PCA and UMAP
Roan Haggar, Federico De Luca, Marco De Petris +10
Numerous metrics exist to quantify the dynamical state of galaxy clusters, both observationally and within simulations. Many of these correlate strongly with one another, but it is…
A Robust Measure of Cosmic Structure beyond the Power-Spectrum: Cosmic Filaments and the Temperature of Dark Matter
Danail Obreschkow, Chris Power, Martin Bruderer +1
We discover that the mass of dark matter particles mDM is imprinted in phase-correlations of the cosmic density field more significantly than in the 2-point correlation. In particu…
Unveiling the population of massive quenched galaxies at in the COLIBRE simulations -- II. The role of AGN feedback and environment on their emergence
Ãngel Chandro-Gómez, Claudia del P. Lagos, Chris Power +16
Early () Massive (), Quenched Galaxies (MQGs) challenge current galaxy formation models. In this series, we study these…
Self-consistent massive disks in triaxial dark matter halos
Jeremy Bailin, Josh D. Simon, Alberto D. Bolatto +2
Galactic disks in triaxial dark matter halos become deformed by the elliptical potential in the plane of the disk in such a way as to counteract the halo ellipticity. We develop a…
Extracting Galaxy Merger Timescales II: A new fitting formula
Rhys J. J. Poulton, Chris Power, Aaron S. G. Robotham +2
Predicting the merger timescale () of merging dark matter halos, based on their orbital parameters and the structural properties of their hosts, is a fundamental pr…
The large-scale environment from cosmological simulations I: The baryonic cosmic web
Weiguang Cui, Alexander Knebe, Gustavo Yepes +5
Using a series of cosmological simulations that includes one dark-matter-only (DM-only) run, one gas cooling-star formation-supernovae feedback (CSF) run and one that additionally…
nIFTy galaxy cluster simulations II: radiative models
Federico Sembolini, Pascal Jahan Elahi, Frazer R. Pearce +19
We have simulated the formation of a massive galaxy cluster (M = 1.110) in a CDM universe using 10 different codes (RAMSES, 2 i…
CosmoDRAGoN simulations -- I. Dynamics and observable signatures of radio jets in cosmological environments
Patrick M. Yates-Jones, Stanislav S. Shabala, Chris Power +4
We present the Cosmological Double Radio Active Galactic Nuclei (CosmoDRAGoN) project: a large suite of simulated AGN jets in cosmological environments. These environments sample t…
Hot accretion onto spiral galaxies: the origin of extended and warped HI discs
Sriram Sankar, Jonathan Stern, Chris Power +6
Gas accretion, hot ( K) atmospheres, and a tilt between the rotation axes of the disc and the atmosphere are all common predictions of standard galaxy evolution theory f…
On the redshift evolution of the spin parameter in cosmological simulations
Tomas Riera, Alexander Knebe, Chris Power +2
Although the spin parameter of dark matter halos is well known to follow a log-normal distribution at fixed epoch, its quantitative redshift evolution - encompassing both the mean…
SURFS: Riding the waves with Synthetic UniveRses For Surveys
Pascal J. Elahi, Charlotte Welker, Chris Power +4
We present the Synthetic UniveRses For Surveys ({\sc surfs}) simulations, a set of N-body/Hydro simulations of the concordance Cold Dark Matter (\LCDM) cosmology. These simula…
Predicting the Non-Thermal Pressure in Galaxy Clusters
Andrew Sullivan, Stanislav Shabala, Chris Power +2
We investigate the relationship between a galaxy cluster's hydrostatic equilibrium state, the entropy profile, , of the intracluster gas, and the system's non-thermal pressure (…