Justin I. Read
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Converging on the eccentricity of massive black hole binaries in galactic mergers Open
Binaries of supermassive black holes (MBHBs) represent the primary sources of the gravitational wave background (GWB) detectable by Pulsar Timing Arrays (PTAs). The eccentricity with which binaries form in galactic mergers is the key param…
View article: The PARADIGM project II: the lifetimes and quenching of satellites in Milky Way-mass haloes
The PARADIGM project II: the lifetimes and quenching of satellites in Milky Way-mass haloes Open
The abundance and star formation histories of satellites of Milky Way (MW)-like galaxies are linked to their hosts’ assembly histories. To explore this connection, we use the PARADIGM suite of zoom-in hydrodynamical simulations of MW-mass …
View article: First Data Release of the Merian Survey: A Wide-field Imaging Survey of Dwarf Galaxies at <i>z</i> ∼ 0.06–0.10
First Data Release of the Merian Survey: A Wide-field Imaging Survey of Dwarf Galaxies at <i>z</i> ∼ 0.06–0.10 Open
We present an overview of the Merian Survey and its forthcoming first data release (DR1), an optical imaging survey optimized for studying bright-star-forming dwarf galaxies. Merian uses two medium-band filters (N708 and N540, centered at …
View article: The radial acceleration relation at the EDGE of galaxy formation: testing its universality in low-mass dwarf galaxies
The radial acceleration relation at the EDGE of galaxy formation: testing its universality in low-mass dwarf galaxies Open
A tight correlation between the baryonic and observed acceleration of galaxies has been reported over a wide range of mass ($10^8 < M_{\rm bar}/{\rm M}_\odot < 10^{11}$) - the Radial Acceleration Relation (RAR). This has been interpreted a…
Realistic consecutive galaxy mergers form eccentric pulsar timing array sources Open
Results from pulsar timing arrays (PTAs) show evidence of a gravitational wave background (GWB) consistent with a population of unresolved supermassive black hole binaries (BHBs). The observed spectrum shows a flattening at lower frequenci…
View article: Trial by FIRE: probing the dark matter density profile of dwarf galaxies with GraphNPE
Trial by FIRE: probing the dark matter density profile of dwarf galaxies with GraphNPE Open
The dark matter (DM) distribution in dwarf galaxies provides crucial insights into both structure formation and the particle nature of DM. GraphNPE (Graph Neural Posterior Estimator), first introduced in Nguyen et al. (2023), is a novel si…
View article: Estimation of toe brachial index based on forefoot Doppler waveforms
Estimation of toe brachial index based on forefoot Doppler waveforms Open
Aims The toe brachial index (TBI) is a standard diagnostic tool for assessing distal perfusion in peripheral arterial disease (PAD) but has several limitations. Doppler waveform characteristics of forefoot arteries, such as acceleration in…
View article: The CHIMERA Survey: The first CO detection in Leo T, the lowest mass known galaxy still hosting cold molecular gas
The CHIMERA Survey: The first CO detection in Leo T, the lowest mass known galaxy still hosting cold molecular gas Open
We report the first CO detection in Leo T, representing the most extreme observation of carbon monoxide molecules in the lowest stellar mass gas-rich dwarf galaxy ( M ⋆ ∼ 10 5 M ⊙ ) known to date. We acquired and present new Atacama Compac…
View article: <scp>edge</scp>: the emergence of dwarf galaxy scaling relations from cosmological radiation-hydrodynamics simulations
<span>edge</span>: the emergence of dwarf galaxy scaling relations from cosmological radiation-hydrodynamics simulations Open
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 covering the ultrafaint to the dwarf irregular regime ($10^4 \le …
The galaxy-halo connection of disc galaxies over six orders of magnitude in stellar mass Open
The relations between stellar ( M * ), gas ( M gas ), baryonic ( M bar = M * + M gas ), and dark matter halo mass ( M 200 ) provide unique constraints on galaxy formation and cosmology. The shape of the relations constrains how galaxies re…
View article: Mass modelling the Andromeda Dwarf Galaxies: Andromeda VI and Andromeda XXIII
Mass modelling the Andromeda Dwarf Galaxies: Andromeda VI and Andromeda XXIII Open
Accurately mapping the mass profiles of low mass dwarf spheroidal (dSph) galaxies allows us to test predictions made by dark matter (DM) models. To date, such analyses have primarily been performed on Milky Way (MW) satellites. Meanwhile, …
View article: EDGE: a new model for nuclear star cluster formation in dwarf galaxies
EDGE: a new model for nuclear star cluster formation in dwarf galaxies Open
Nuclear star clusters (NSCs) are among the densest stellar systems in the Universe and are found at the centres of many spiral and elliptical galaxies, and up to ${\sim }\,$40 per cent of dwarf galaxies. However, their formation mechanisms…
View article: The PARADIGM project – I. How early merger histories shape the present-day sizes of Milky-Way-mass galaxies
The PARADIGM project – I. How early merger histories shape the present-day sizes of Milky-Way-mass galaxies Open
How mergers affect galaxy formation depends on both feedback processes, and on the geometry and strength of the mergers themselves. We introduce the PARADIGM project, where we study the response of a simulated Milky-Way-mass galaxy ($M_{\r…
View article: Theoretical Predictions for the Inner Dark Matter Distribution in the Milky Way Informed by Simulations
Theoretical Predictions for the Inner Dark Matter Distribution in the Milky Way Informed by Simulations Open
We build a theoretical range for the Milky Way's (MW) inner dark matter (DM) distribution informed by the FIRE-2, Auriga, VINTERGATAN-GM, and TNG50 simulation suites assuming the canonical cold dark matter (CDM) model. The DM density profi…
View article: EDGE-INFERNO: Simulating Every Observable Star in Faint Dwarf Galaxies and Their Consequences for Resolved-star Photometric Surveys
EDGE-INFERNO: Simulating Every Observable Star in Faint Dwarf Galaxies and Their Consequences for Resolved-star Photometric Surveys Open
Interpretation of data from faint dwarf galaxies is made challenging by observations limited to only the brightest stars. We present a major improvement to tackle this challenge by undertaking zoomed cosmological simulations that resolve t…
New constraints on the central mass contents of Omega Centauri from combined stellar kinematics and pulsar timing Open
Aims . We performed a combined analysis of stellar kinematics with line-of-sight accelerations of millisecond pulsars (MSPs) to probe the mass content of Omega Centauri ( ω Cen). Our mass model includes the stellar mass distribution, a mor…
<span>edge</span>: dark matter core creation depends on the timing of star formation Open
We study feedback-driven cold dark matter core creation in the edge suite of radiation-hydrodynamical dwarf galaxy simulations. Understanding this process is crucial when using observed dwarf galaxies to constrain the particle nature of da…
Surviving the waves: evidence for a dark matter cusp in the tidally disrupting Small Magellanic Cloud Open
We use spectroscopic data for ${\sim }6000$ red giant branch stars in the Small Magellanic Cloud (SMC), together with proper motion data from Gaia Early Data Release 3, to build a mass model of the SMC. We test our Jeans mass modelling met…
View article: Merian: A Wide-Field Imaging Survey of Dwarf Galaxies at z~0.06-0.10
Merian: A Wide-Field Imaging Survey of Dwarf Galaxies at z~0.06-0.10 Open
We present the Merian Survey, an optical imaging survey optimized for studying the physical properties of bright star-forming dwarf galaxies. Merian is carried out with two medium-band filters ($N708$ and $N540$, centered at $708$ and $540…
Core Formation by Binary Scouring and Gravitational Wave Recoil in Massive Elliptical Galaxies Open
Scouring by supermassive black hole (SMBH) binaries is the most accepted mechanism for the formation of the cores seen in giant elliptical galaxies. However, an additional mechanism is required to explain the largest observed cores. Gravit…
View article: EDGE-INFERNO: Simulating every observable star in faint dwarf galaxies and their consequences for resolved-star photometric surveys
EDGE-INFERNO: Simulating every observable star in faint dwarf galaxies and their consequences for resolved-star photometric surveys Open
Interpretation of data from faint dwarf galaxies is made challenging by observations limited to only the brightest stars. We present a major improvement to tackle this challenge by undertaking zoomed cosmological simulations that resolve t…
EDGE: Predictable Scatter in the Stellar Mass--Halo Mass Relation of Dwarf Galaxies Open
The stellar-mass--halo-mass (SMHM) relation is central to our understanding of galaxy formation and the nature of dark matter. However, its normalisation, slope, and scatter are highly uncertain at dwarf galaxy scales. In this paper, we pr…
Core formation by binary scouring and gravitational wave recoil in massive elliptical galaxies Open
Scouring by supermassive black hole (SMBH) binaries is the most accepted mechanism for the formation of the cores seen in giant elliptical galaxies. However, an additional mechanism is required to explain the largest observed cores. Gravit…
The PARADIGM project I: How early merger histories shape the present-day sizes of Milky-Way-mass galaxies Open
How mergers affect galaxy formation depends on both feedback processes, and on the geometry and strength of the mergers themselves. We introduce the PARADIGM project, where we study the response of a simulated Milky-Way-mass galaxy ($M_{\r…
View article: Dwarf galaxies imply dark matter is heavier than $\mathbf{2.2 \times 10^{-21}} \, \mathbf{eV}$
Dwarf galaxies imply dark matter is heavier than $\mathbf{2.2 \times 10^{-21}} \, \mathbf{eV}$ Open
It is widely established that a lower bound on the dark matter particle mass, $m$, can be obtained by demanding that the de Broglie wavelength in a given galaxy must be smaller than the virial radius of the galaxy, leading to $m\gtrsim 10^…
EDGE: A new model for Nuclear Star Cluster formation in dwarf galaxies Open
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 ${\sim}$40% of dwarf galaxies. However, their formation mechanisms, …
View article: The Merian survey: design, construction, and characterization of a filter set optimized to find dwarf galaxies and measure their dark matter halo properties with weak lensing
The Merian survey: design, construction, and characterization of a filter set optimized to find dwarf galaxies and measure their dark matter halo properties with weak lensing Open
The Merian survey is mapping ∼ 850 deg2 of the Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) wide layer with two medium-band filters on the 4-m Victor M. Blanco telescope at the Cerro Tololo Inter-American Observatory, with the goal…
View article: JASMINE: Near-infrared astrometry and time-series photometry science
JASMINE: Near-infrared astrometry and time-series photometry science Open
The Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science …
EDGE – Dark matter or astrophysics? Breaking dark matter heating degeneracies with H <span>i</span> rotation in faint dwarf galaxies Open
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 form too few stars to significantly drive dark matter heatin…