James E. Taylor
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View article: Cosmology from UNIONS weak lensing profiles of galaxy clusters
Cosmology from UNIONS weak lensing profiles of galaxy clusters Open
Cosmological information is encoded in the structure of galaxy clusters. In Universes with less matter and larger initial density perturbations, clusters form earlier and have more time to accrete material, leading to a more extended infal…
View article: No Evidence of Asymmetrically Enhanced Star Formation in Infalling Galaxies in UNIONS
No Evidence of Asymmetrically Enhanced Star Formation in Infalling Galaxies in UNIONS Open
Ram pressure stripping is a well-known environmental quenching mechanism that removes gas from galaxies infalling into groups and clusters. In some extreme examples of ram pressure stripping, galaxies with extended gas tails show evidence …
View article: No Evidence of Asymmetrically Enhanced Star Formation in Infalling Galaxies in UNIONS
No Evidence of Asymmetrically Enhanced Star Formation in Infalling Galaxies in UNIONS Open
Ram pressure stripping is a well-known environmental quenching mechanism that removes gas from galaxies infalling into groups and clusters. In some extreme examples of ram pressure stripping, galaxies with extended gas tails show evidence …
View article: Constraining Cosmological Parameters Using the Splashback Radius of Galaxy Clusters
Constraining Cosmological Parameters Using the Splashback Radius of Galaxy Clusters Open
Cosmological parameters such as Ω M and σ 8 can be measured indirectly using various methods, including galaxy cluster abundance and cosmic shear. These measurements constrain the composite parameter S 8 , leading to degeneracy between Ω M…
View article: The infall region as a complementary probe to cluster abundance
The infall region as a complementary probe to cluster abundance Open
Galaxy cluster abundance measurements provide a classic test of cosmology. They are most sensitive to the evolved amplitude of fluctuations, usually expressed as $S_8 = \sigma _8\sqrt{\Omega _{\rm m}/0.3}$. Thus, abundance constraints exhi…
View article: Constraining cosmological parameters using the splashback radius of galaxy clusters
Constraining cosmological parameters using the splashback radius of galaxy clusters Open
Cosmological parameters such as $Ω_{\rm{M}}$ and $σ_{8}$ can be measured indirectly using various methods, including galaxy cluster abundance and cosmic shear. These measurements constrain the composite parameter $S_{8}$, leading to degene…
View article: Reconsidering the dynamical states of galaxy clusters using PCA and UMAP
Reconsidering the dynamical states of galaxy clusters using PCA and UMAP Open
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 not clear whether all of these measures probe the same int…
View article: Halo growth and merger rates as a cosmological test
Halo growth and merger rates as a cosmological test Open
Dark matter haloes grow at a rate that depends on the value of the cosmological parameters σ8 and Ωm through the initial power spectrum and the linear growth factor. While halo abundance is routinely used to constrain these parameters, thr…
View article: Testing the surface brightness fluctuation method on dwarf galaxies in the COSMOS field
Testing the surface brightness fluctuation method on dwarf galaxies in the COSMOS field Open
Dwarf galaxies are important tracers of small-scale cosmological structure, yet much of our knowledge about these systems comes from the limited sample of dwarf galaxies within the Local Group. To make a comprehensive inventory of dwarf po…
View article: Do assumptions about the central density of subhaloes affect dark matter annihilation and lensing calculations?
Do assumptions about the central density of subhaloes affect dark matter annihilation and lensing calculations? Open
Subhalo models play a critical role in dark matter annihilation predictions and galaxy-galaxy lensing studies; however, the internal structure of subhaloes remains highly uncertain. In particular, a growing body of evidence suggests that t…
View article: A universal model for the evolution of tidally stripped systems
A universal model for the evolution of tidally stripped systems Open
Accurate models of the structural evolution of dark matter subhaloes, as they orbit within larger systems, are fundamental to understanding the detailed distribution of dark matter at the present day. Numerical simulations of subhalo evolu…
View article: Simons Observatory: Constraining inflationary gravitational waves with multitracer B -mode delensing
Simons Observatory: Constraining inflationary gravitational waves with multitracer B -mode delensing Open
We introduce and validate a delensing framework for the Simons Observatory (SO), which will be used to improve constraints on inflationary gravitational waves by reducing the lensing noise in measurements of the B modes in CMB polarization…
View article: Cluster assembly times as a cosmological test
Cluster assembly times as a cosmological test Open
The abundance of galaxy clusters in the low-redshift Universe provides an important cosmological test, constraining a product of the initial amplitude of fluctuations and the amount by which they have grown since early times. The degenerac…
View article: A hierarchical clustering method for quantifying satellite abundance
A hierarchical clustering method for quantifying satellite abundance Open
We present a new method for quantifying the abundance of satellites around field galaxies and in groups. The method is designed to work with samples such as photometric redshift catalogues, that do not have full spectroscopic coverage, but…
View article: Evolution of subhalo orbits in a smoothly growing host halo potential
Evolution of subhalo orbits in a smoothly growing host halo potential Open
The orbital parameters of dark matter (DM) subhaloes play an essential role in determining their mass-loss rates and overall spatial distribution within a host halo. Haloes in cosmological simulations grow by a combination of relatively sm…
View article: Density reconstruction from biased tracers and its application to primordial non-Gaussianity
Density reconstruction from biased tracers and its application to primordial non-Gaussianity Open
Large-scale Fourier modes of the cosmic density field are of great value for learning about cosmology because of their well-understood relationship to fluctuations in the early universe. However, cosmic variance generally limits the statis…
View article: Mass-loss in tidally stripped systems: the energy-based truncation method
Mass-loss in tidally stripped systems: the energy-based truncation method Open
The ability to accurately predict the evolution of tidally stripped haloes is important for understanding galaxy formation and testing the properties of dark matter. Most studies of substructure evolution make predictions based on empirica…
View article: The Next Generation Virgo Cluster Survey (NGVS). XIV. The Discovery of Low-mass Galaxies and a New Galaxy Catalog in the Core of the Virgo Cluster<sup>∗</sup>
The Next Generation Virgo Cluster Survey (NGVS). XIV. The Discovery of Low-mass Galaxies and a New Galaxy Catalog in the Core of the Virgo Cluster<sup>∗</sup> Open
The Next Generation Virgo Cluster Survey (NGVS) was designed to provide a deep census of baryonic structures in the Virgo cluster. The survey covers the 104 deg 2 area from the core of Virgo out to one virial radius, in the u * griz bandpa…
View article: Science with the Large Synoptic Survey Telescope
Science with the Large Synoptic Survey Telescope Open
The Large Synoptic Survey Telescope (LSST) is set to begin commissioning its instruments in 2021, with science verification commencing in 2022 and science operations in 2023. With its large field of view and 3.2 Gigapixel camera, it will s…
View article: Astronomy in a Low-Carbon Future
Astronomy in a Low-Carbon Future Open
The global climate crisis poses new risks to humanity, and with them, new challenges to the practices of professional astronomy. Avoiding the more catastrophic consequences of global warming by more than 1.5 degrees requires an immediate r…
View article: The Euclid Mission
The Euclid Mission Open
Euclid is an ESA-led medium class space mission selected in October 2011, with launch planned for 2022. The Euclid mission aims at understanding why the expansion of the Universe is accelerating and what is the nature of the source - commo…
View article: Theoretical Astrophysics in Canada
Theoretical Astrophysics in Canada Open
Theory plays an essential role in astrophysics, both in planning and motivating observations or experiments, and in extracting deeper understanding from their findings. As investment in infrastructure grows, co-investment in theory should …
View article: The assembly of the Virgo cluster, traced by its galaxy haloes
The assembly of the Virgo cluster, traced by its galaxy haloes Open
Kinematic studies have produced accurate measurements of the total dark matter mass and mean dark matter density within the optical extent of galaxies for large samples of objects. Here we consider theoretical predictions for the latter qu…
View article: The Next Generation Virgo Cluster Survey. XXIII. Fundamentals of Nuclear Star Clusters over Seven Decades in Galaxy Mass
The Next Generation Virgo Cluster Survey. XXIII. Fundamentals of Nuclear Star Clusters over Seven Decades in Galaxy Mass Open
Using deep, high-resolution optical imaging from the Next Generation Virgo Cluster Survey, we study the properties of nuclear star clusters (NSCs) in a sample of nearly 400 quiescent galaxies in the core of Virgo with stellar masses 10 5 ≲…
View article: Major mergers between dark matter haloes – II. Profile and concentration changes
Major mergers between dark matter haloes – II. Profile and concentration changes Open
Several lines of evidence suggest that as dark matter haloes grow their scale\nradius increases, and that the density in their central region drops. Major\nmergers seem an obvious mechanism to explain both these phenomena, and the\nresulti…
View article: Major mergers between dark matter haloes – I. Predictions for size, shape, and spin
Major mergers between dark matter haloes – I. Predictions for size, shape, and spin Open
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 connection between the two is unclear. One open question, in particu…
View article: Quantifying the abundance of faint, low-redshift satellite galaxies in the COSMOS survey
Quantifying the abundance of faint, low-redshift satellite galaxies in the COSMOS survey Open
Faint dwarf satellite galaxies are important as tracers of small-scale structure, but remain poorly characterized outside the Local Group, due to the difficulty of identifying them consistently at larger distances. We review a recently pro…
View article: A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE)
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) Open
The Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) is a blind narrow-band (NB) Hα +[NII] imaging survey carried out with MegaCam at the Canada–France–Hawaii Telescope. The survey covers the whole Virgo cluster region fro…
View article: The phase-space structure of tidally stripped haloes
The phase-space structure of tidally stripped haloes Open
We propose a new method for generating equilibrium models of spherical systems of collisionless particles that are finite in extent, but whose central regions resemble dark matter halos from cosmological simulations. This method involves i…
View article: Approaches for small RNA-seq in Galaxy
Approaches for small RNA-seq in Galaxy Open