166 citations · 617 across the 24 of their papers we have counts for
25 papers
Stirred, not shaken: Dislodging Centauri from the Sausage galaxy through bar resonances
Axel Mannu, Chervin F. P. Laporte, Matthew D. A. Orkney +2
We test the idea proposed by Laporte \& Orkney that Centauri (Cen) is the central nuclear star cluster of the Gaia-Sausage-Enceladus galaxy (GSE) which got dislodged by the…
The Last Galactic Firework: Timing the last significant merger with stars, globular clusters and Centauri
Chervin F. P. Laporte, Matthew D. A. Orkney
We present a robust method to empirically infer the timing of the last significant merger in the Milky Way which is tested against fully cosmological models of galaxy formation. We…
The dawn is quiet II: Gaia XP constraints on the Milky Way's proto-Galaxy from very metal-poor MDF tails
Boquan Chen, Matthew D. A. Orkney, Yuan-Sen Ting +1
The earliest phase of the Milky Way's evolution involved a transition from a dispersion-supported proto-galaxy to a rotationally supported disk. A key chemical signature of this tr…
The emergence of globular clusters and globular-cluster-like dwarfs
Ethan D. Taylor, Justin I. Read, Matthew D. A. Orkney +7
Globular clusters (GCs) are among the oldest and densest stellar systems in the Universe, yet how they form remains a mystery. Here we present a suite of cosmological simulations i…
Build-up and survival of the disc: From numerical models of galaxy formation to the Milky Way
Matthew D. A. Orkney, Chervin F. P. Laporte
We study the build-up and survival of angular momentum in the stellar disc using a statistical suite of cosmological simulations of Milky Way-mass galaxies. Our results show that s…
The Milky Way in context: The formation of galactic discs and chemical sequences from a cosmological perspective
Matthew D. A. Orkney, Chervin F. P. Laporte, Robert J. J. Grand +1
We study the formation of chemical sequences in the stellar disc of Milky Way (MW)-mass galaxies in a full cosmological context with the auriga simulations. We focus on the conditi…
EDGE: The emergence of dwarf galaxy scaling relations from cosmological radiation-hydrodynamics simulations
Martin P. Rey, Ethan Taylor, Emily I. Gray +14
We present a new suite of EDGE (`Engineering Dwarfs at Galaxy formation's Edge') cosmological zoom simulations. The suite includes 15 radiation-hydrodynamical dwarf galaxies coveri…
Discovery of A Starburst in the Early Milky Way at [Fe/H]
Boquan Chen, Matthew Orkney, Yuan-Sen Ting +1
We present an analysis of very metal-poor (VMP) and metal-poor stars () in the Gaia BP/RP or XP catalog, which reveals two distinct metallicity distri…
EDGE: Predictable Scatter in the Stellar Mass--Halo Mass Relation of Dwarf Galaxies
Stacy Y. Kim, Justin I. Read, Martin P. Rey +6
The stellar-mass--halo-mass (SMHM) relation is central to our understanding of galaxy formation and the nature of dark matter. However, its normalisation, slope, and scatter are hi…
EDGE: A new model for Nuclear Star Cluster formation in dwarf galaxies
Emily I. Gray, Justin I. Read, Ethan Taylor +8
Nuclear Star Clusters (NSCs) are amongst the densest stellar systems in the Universe and are found at the centres of many bright spiral and elliptical galaxies, and up to 4…
EDGE -- Dark matter or astrophysics? Breaking dark matter heating degeneracies with HI rotation in faint dwarf galaxies
Martin P. Rey, Matthew D. A. Orkney, Justin I. Read +6
Low-mass dwarf galaxies are expected to reside within dark matter haloes that have a pristine, `cuspy' density profile within their stellar half-light radii. This is because they f…
Action-based dynamical models of M31-like galaxies
Paula Gherghinescu, Payel Das, Robert J. J. Grand +1
In this work, we present an action-based dynamical equilibrium model to constrain the phase-space distribution of stars in the stellar halo, present-day dark matter distribution, a…
EDGE: The direct link between mass growth history and the extended stellar haloes of the faintest dwarf galaxies
Alex Goater, Justin I. Read, Noelia E. D. Noël +9
Ultra-faint dwarf galaxies (UFDs) are commonly found in close proximity to the Milky Way and other massive spiral galaxies. As such, their projected stellar ellipticity and extende…
Exploring the diversity and similarity of radially anisotropic Milky Way-like stellar haloes: implications for disrupted dwarf galaxy searches
Matthew D. A. Orkney, Chervin F. P. Laporte, Robert J. J. Grand +7
We investigate the properties of mergers comparable to the Gaia-Sausage-Enceladus (GSE) using cosmological hydrodynamical simulations of Milky Way-like galaxies. The merger progeni…
EDGE: The shape of dark matter haloes in the faintest galaxies
Matthew D. A. Orkney, Ethan Taylor, Justin I. Read +5
Collisionless Dark Matter Only (DMO) structure formation simulations predict that Dark Matter (DM) haloes are prolate in their centres and triaxial towards their outskirts. The add…
The impact of two massive early accretion events in a Milky Way-like galaxy: repercussions for the buildup of the stellar disc and halo
Matthew D. A. Orkney, Chervin F. P. Laporte, Robert J. J. Grand +5
We identify and characterise a Milky Way-like realisation from the Auriga simulations with two consecutive massive mergers Gyr apart at high redshift, comparable to the re…
EDGE: the puzzling ellipticity of Eridanus II's star cluster and its implications for dark matter at the heart of an ultra-faint dwarf
Matthew D. A. Orkney, Justin I. Read, Oscar Agertz +6
The Eridanus II (EriII) 'ultra-faint' dwarf has a large () and low mass () star cluster (SC) offset from its centre by $23\pm3\,\text{…
EDGE: What shapes the relationship between HI and stellar observables in faint dwarf galaxies?
Martin P. Rey, Andrew Pontzen, Oscar Agertz +5
We show how the interplay between feedback and mass-growth histories introduces scatter in the relationship between stellar and neutral gas properties of field faint dwarf galaxies…
EDGE: Two routes to dark matter core formation in ultra-faint dwarfs
Matthew D. A. Orkney, Justin I. Read, Martin P. Rey +6
In the standard Lambda cold dark matter paradigm, pure dark matter simulations predict dwarf galaxies should inhabit dark matter haloes with a centrally diverging density `cusp'. T…
New Constraints on the Mass of Fermionic Dark Matter from Dwarf Spheroidal Galaxies
James Alvey, Nashwan Sabti, Victoria Tiki +7
Dwarf spheroidal galaxies are excellent systems to probe the nature of fermionic dark matter due to their high observed dark matter phase-space density. In this work, we review, re…
EDGE: A new approach to suppressing numerical diffusion in adaptive mesh simulations of galaxy formation
Andrew Pontzen, Martin P. Rey, Corentin Cadiou +4
We introduce a new method to mitigate numerical diffusion in adaptive mesh refinement (AMR) simulations of cosmological galaxy formation, and study its impact on a simulated dwarf…
EDGE: From quiescent to gas-rich to star-forming low-mass dwarf galaxies
Martin P. Rey, Andrew Pontzen, Oscar Agertz +3
We study how star formation is regulated in low-mass field dwarf galaxies (), using cosmological high-resolution ($3 \, \text{pc}…
EDGE: The origin of scatter in ultra-faint dwarf stellar masses and surface brightnesses
Martin P. Rey, Andrew Pontzen, Oscar Agertz +4
We demonstrate how the least luminous galaxies in the Universe, ultra-faint dwarf galaxies, are sensitive to their dynamical mass at the time of cosmic reionization. We select a lo…
Globular clusters as probes of dark matter cusp-core transformations
M. D. A. Orkney, J. I. Read, James A. Petts +1
Bursty star formation in dwarf galaxies can slowly transform a steep dark matter cusp into a constant density core. We explore the possibility that globular clusters (GCs) retain a…