W. J. Couch
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View article: Ultra-diffuse, ultra-different: observed versus simulated ultra-diffuse galaxies live in fundamentally different haloes
Ultra-diffuse, ultra-different: observed versus simulated ultra-diffuse galaxies live in fundamentally different haloes Open
In this work, we compare galaxies from the NIHAO and HESTIA simulation suites to ultra-diffuse galaxies (UDGs) with spectroscopically measured dynamical masses. For each observed UDG, we identify the simulated dark matter halo that best ma…
View article: A Comprehensive Look at PUDG-R21: Stellar Population and Kinematics of a Globular Cluster-Rich Ultra-Diffuse Galaxy in the Perseus Cluster
A Comprehensive Look at PUDG-R21: Stellar Population and Kinematics of a Globular Cluster-Rich Ultra-Diffuse Galaxy in the Perseus Cluster Open
We present the analysis of the stellar populations and kinematics of the globular cluster (GC) rich ultra-diffuse galaxy, PUDG-R21, using spectroscopic observations obtained with the Keck Cosmic Web Imager (KCWI). The recessional velocity …
View article: A Comprehensive Look at PUDG-R21: Stellar Population and Kinematics of a Globular Cluster-Rich Ultra-Diffuse Galaxy in the Perseus Cluster
A Comprehensive Look at PUDG-R21: Stellar Population and Kinematics of a Globular Cluster-Rich Ultra-Diffuse Galaxy in the Perseus Cluster Open
We present the analysis of the stellar populations and kinematics of the globular cluster (GC) rich ultra-diffuse galaxy, PUDG-R21, using spectroscopic observations obtained with the Keck Cosmic Web Imager (KCWI). The recessional velocity …
View article: The Impact of Cluster Mergers on Galaxy Properties
The Impact of Cluster Mergers on Galaxy Properties Open
The impact of galaxy cluster mergers on the properties of the resident galaxies remains poorly understood. In this paper, we investigate the effects of merging environments on star formation (SF) activity in nearby clusters ($0.04
View article: The impact of cluster mergers on galaxy properties
The impact of cluster mergers on galaxy properties Open
The impact of galaxy cluster mergers on the properties of the resident galaxies remains poorly understood. In this paper, we investigate the effects of merging environments on star formation (SF) activity in nearby clusters ( $0.04\lt z\lt…
View article: Comparing E-MOSAICS predictions of high-redshift proto-globular clusters with <i>JWST</i> observations in lensed galaxies
Comparing E-MOSAICS predictions of high-redshift proto-globular clusters with <i>JWST</i> observations in lensed galaxies Open
High-resolution imaging and strong gravitational lensing of high-redshift galaxies have enabled the detection of compact sources with properties similar to nearby massive star clusters. Often found to be very young, these sources may be gl…
View article: Comparing E-MOSAICS predictions of high-redshift proto-globular clusters with JWST observations in lensed galaxies
Comparing E-MOSAICS predictions of high-redshift proto-globular clusters with JWST observations in lensed galaxies Open
High-resolution imaging and strong gravitational lensing of high-redshift galaxies have enabled the detection of compact sources with properties similar to nearby massive star clusters. Often found to be very young, these sources may be gl…
View article: The PIPER survey. II. The globular cluster systems of low surface brightness galaxies in the Perseus cluster
The PIPER survey. II. The globular cluster systems of low surface brightness galaxies in the Perseus cluster Open
We present Hubble Space Telescope ACS/WFC and WFC3/UVIS imaging for a sample of 50 low-surface brightness (LSB) galaxies in the $\sim 10^{15}$ M$_{\odot }$ Perseus cluster, which were originally identified in ground-based imaging. We measu…
View article: The PIPER Survey. II. The Globular Cluster Systems of Low Surface Brightness Galaxies in the Perseus Cluster
The PIPER Survey. II. The Globular Cluster Systems of Low Surface Brightness Galaxies in the Perseus Cluster Open
We present Hubble Space Telescope ACS/WFC and WFC3/UVIS imaging for a sample of 50 low surface brightness (LSB) galaxies in the $\sim$10$^{15}$ M$_{\odot}$ Perseus cluster, which were originally identified in ground-based imaging. We measu…
View article: WST - Widefield Spectroscopic Telescope: motivation, science drivers and top level requirements for a new dedicated facility
WST - Widefield Spectroscopic Telescope: motivation, science drivers and top level requirements for a new dedicated facility Open
In this paper, we describe the wide-field spectroscopic survey telescope (WST) project. WST is a 12-metre wide-field spectroscopic survey telescope with simultaneous operation of a large field-of-view (3 sq. degree), high-multiplex (20,000…
View article: WST -- Widefield Spectroscopic Telescope: Motivation, science drivers and top-level requirements for a new dedicated facility
WST -- Widefield Spectroscopic Telescope: Motivation, science drivers and top-level requirements for a new dedicated facility Open
In this paper, we describe the wide-field spectroscopic survey telescope (WST) project. WST is a 12-metre wide-field spectroscopic survey telescope with simultaneous operation of a large field-of-view (3 sq. degree), high-multiplex (20,000…
View article: Analysis of Galaxies at the Extremes: A Kinematic Analysis of the Virgo Cluster Dwarfs VCC 9 and VCC 1448 using the Keck Cosmic Web Imager
Analysis of Galaxies at the Extremes: A Kinematic Analysis of the Virgo Cluster Dwarfs VCC 9 and VCC 1448 using the Keck Cosmic Web Imager Open
We present spatially resolved Keck Cosmic Web Imager stellar spectroscopy of the Virgo cluster dwarf galaxies VCC 9 and VCC 1448. These galaxies have similar stellar masses and large half-light radii but very different globular cluster (GC…
View article: Analysis of galaxies at the extremes: a kinematic analysis of the Virgo cluster dwarfs VCC 9 and VCC 1448 using the Keck cosmic web imager
Analysis of galaxies at the extremes: a kinematic analysis of the Virgo cluster dwarfs VCC 9 and VCC 1448 using the Keck cosmic web imager Open
We present spatially resolved Keck Cosmic Web Imager stellar spectroscopy of the Virgo cluster dwarf galaxies VCC 9 and VCC 1448. These galaxies have similar stellar masses and large half-light radii but very different globular cluster (GC…
View article: Origin of the correlation between stellar kinematics and globular cluster system richness in ultradiffuse galaxies
Origin of the correlation between stellar kinematics and globular cluster system richness in ultradiffuse galaxies Open
Observational surveys have found that the dynamical masses of ultradiffuse galaxies (UDGs) correlate with the richness of their globular cluster (GC) system. This could be explained if GC-rich galaxies formed in more massive dark matter ha…
View article: Origin of the correlation between stellar kinematics and globular cluster system richness in ultra-diffuse galaxies
Origin of the correlation between stellar kinematics and globular cluster system richness in ultra-diffuse galaxies Open
Observational surveys have found that the dynamical masses of ultra-diffuse galaxies (UDGs) correlate with the richness of their globular cluster (GC) system. This could be explained if GC-rich galaxies formed in more massive dark matter h…
View article: The Wide-field Spectroscopic Telescope (WST) Science White Paper
The Wide-field Spectroscopic Telescope (WST) Science White Paper Open
The Wide-field Spectroscopic Telescope (WST) is proposed as a new facility dedicated to the efficient delivery of spectroscopic surveys. This white paper summarises the initial concept as well as the corresponding science cases. WST will f…
View article: Constraining the stellar populations of ultra-diffuse galaxies in the MATLAS survey using spectral energy distribution fitting
Constraining the stellar populations of ultra-diffuse galaxies in the MATLAS survey using spectral energy distribution fitting Open
We use spectral energy distribution fitting to place constraints on the stellar populations of 59 ultra-diffuse galaxies (UDGs) in the low-to-moderate density fields of the MATLAS survey. We use the routine prospector, coupled with archiva…
View article: Constraining the stellar populations of ultra-diffuse galaxies in the MATLAS survey using spectral energy distribution fitting
Constraining the stellar populations of ultra-diffuse galaxies in the MATLAS survey using spectral energy distribution fitting Open
We use spectral energy distribution (SED) fitting to place constraints on the stellar populations of 59 ultra-diffuse galaxies (UDGs) in the low-to-moderate density fields of the MATLAS survey. We use the routine PROSPECTOR, coupled with a…
View article: The 2dF galaxy redshift survey: The blue galaxy fraction and implications for the Butcher-Oemler effect
The 2dF galaxy redshift survey: The blue galaxy fraction and implications for the Butcher-Oemler effect Open
We derive the fraction of blue galaxies in a sample of clusters at z < 0.11 and the general field at the same redshift. The value of the blue fraction is observed to depend on the luminosity limit adopted, cluster-centric radius and, more …
View article: Globular cluster formation from gravitational tidal effects of merging and interacting galaxies
Globular cluster formation from gravitational tidal effects of merging and interacting galaxies Open
We investigate the spatial, kinematic and chemical properties of globular cluster systems formed in merging and interacting galaxies using N-body-smoothed particle hydrodynamics (SPH) simulations. Although we cannot resolve individual clus…
View article: Galaxy luminosity functions in WINGS clusters
Galaxy luminosity functions in WINGS clusters Open
Aims. Using V band photometry of the WINGS survey, we derive galaxy luminosity functions (LF) in nearby clusters. This sample is complete down to MV = −15.15, and it is homogeneous, thus allowing the study of an unbiased sample of clusters…
View article: WINGS: A WIde-field nearby Galaxy-cluster survey: III. Deep near-infrared photometry of 28 nearby clusters
WINGS: A WIde-field nearby Galaxy-cluster survey: III. Deep near-infrared photometry of 28 nearby clusters Open
This is the third paper in a series devoted to the WIde-field Nearby Galaxy-cluster Survey (WINGS).WINGS is a long-term project aimed at gathering wide-field, multiband imaging and spectroscopy of galaxies in a complete sample of 77 X-ray …
View article: Galaxy threshing and the origin of ultra-compact dwarf galaxies in the Fornax cluster
Galaxy threshing and the origin of ultra-compact dwarf galaxies in the Fornax cluster Open
A recent all-object spectroscopic survey centred on the Fornax cluster of galaxies has discovered a population of subluminous and extremely compact members, called 'ultra-compact dwarf' (UCD) galaxies. In order to clarify the origin of the…
View article: The WiggleZ Dark Energy Survey: 1000 redshifts and beyond
The WiggleZ Dark Energy Survey: 1000 redshifts and beyond Open
Here we outline design aspects and first results of the WiggleZ Dark Energy Survey that has recently been awarded long-term status on the AAT from the 2006B semester. The primary aim of the WiggleZ Dark Energy Survey is to use baryonic aco…
View article: Stellar population gradients in the cores of nearby field E+A galaxies
Stellar population gradients in the cores of nearby field E+A galaxies Open
We have selected a sample of local E+A galaxies from the Sloan Digital Sky Survey (SDSS) Data Release 7 for follow-up integral field spectroscopy with the Wide Field Spectrograph (WiFeS) on the Australian National University's (ANU) 2.3-m …
View article: The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity
The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity Open
We have made the largest volume measurement to date of the transition to large-scale homogeneity in the distribution of galaxies. We use the WiggleZ survey, a spectroscopic survey of over 200 000 blue galaxies in a cosmic volume of ∼1 h−3 …
View article: The 2dF galaxy redshift survey: The local E+A galaxy population
The 2dF galaxy redshift survey: The local E+A galaxy population Open
We select a sample of low-redshift (z ∼ 0.1) E+A galaxies from the 2dF Galaxy Redshift Survey (2dFGRS). The spectra of these objects are defined by strong hydrogen Balmer absorption lines (Hδ, Hγ, Hβ) combined with a lack of [O II] 3727-Å …
View article: WINGS-SPE II: A catalog of stellar ages and star formation histories, stellar masses and dust extinction values for local clusters galaxies
WINGS-SPE II: A catalog of stellar ages and star formation histories, stellar masses and dust extinction values for local clusters galaxies Open
Context. The WIde-field Nearby Galaxy clusters Survey (wings) is a project whose primary goal is to study the galaxy populations in clusters in the local universe (z < 0.07) and of the influence of environment on their stellar populations.…
View article: The WiggleZ Dark Energy Survey: Testing the cosmological model with baryon acoustic oscillations at z= 0.6
The WiggleZ Dark Energy Survey: Testing the cosmological model with baryon acoustic oscillations at z= 0.6 Open
We measure the imprint of baryon acoustic oscillations (BAOs) in the galaxy clustering pattern at the highest redshift achieved to date, z= 0.6, using the distribution of N= 132 509 emission-line galaxies in the WiggleZ Dark Energy Survey.…
View article: Dynamical evolution of globular cluster systems in clusters of galaxies - I. The case of NGC 1404 in the Fornax cluster
Dynamical evolution of globular cluster systems in clusters of galaxies - I. The case of NGC 1404 in the Fornax cluster Open
We investigate, via numerical simulations, the tidal stripping and accretion of globular clusters (GCs). In particular, we focus on creating models that simulate the situation for the GC systems of NGC 1404 and 1399 in the Fornax cluster, …