Douglas Applegate
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View article: Machine learning approaches to enhance diagnosis and staging of patients with MASLD using routinely available clinical information
Machine learning approaches to enhance diagnosis and staging of patients with MASLD using routinely available clinical information Open
Aims Metabolic dysfunction Associated Steatotic Liver Disease (MASLD) outcomes such as MASH (metabolic dysfunction associated steatohepatitis), fibrosis and cirrhosis are ordinarily determined by resource-intensive and invasive biopsies. W…
View article: Weak lensing mass modeling bias and the impact of miscentring
Weak lensing mass modeling bias and the impact of miscentring Open
Parametric modeling of galaxy cluster density profiles from weak lensing observations leads to a mass bias, whose detailed understanding is critical in deriving accurate mass-observable relations for constraining cosmological models. Drawi…
View article: Spectroscopic Confirmation of Five Galaxy Clusters at z > 1.25 in the 2500 deg 2 SPT-SZ Survey
Spectroscopic Confirmation of Five Galaxy Clusters at z > 1.25 in the 2500 deg 2 SPT-SZ Survey Open
© 2018. The American Astronomical Society. All rights reserved.. We present spectroscopic confirmation of five galaxy clusters at 1.25 < z < 1.5, discovered in the 2500 deg2 South Pole Telescope Sunyaev-Zel'dovich (SZ) survey. These cluste…
View article: Cluster Cosmology Constraints from the 2500 deg 2 SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space Telescope
Cluster Cosmology Constraints from the 2500 deg 2 SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space Telescope Open
© 2019. The American Astronomical Society. All rights reserved. We derive cosmological constraints using a galaxy cluster sample selected from the 2500 deg2 SPT-SZ survey. The sample spans the redshift range 0.25 < z < 1.75 and contains 34…
View article: Mass calibration of distant SPT galaxy clusters through expanded weak-lensing follow-up observations with <i>HST</i>, VLT, & Gemini-South
Mass calibration of distant SPT galaxy clusters through expanded weak-lensing follow-up observations with <i>HST</i>, VLT, & Gemini-South Open
Expanding from previous work, we present weak-lensing (WL) measurements for a total sample of 30 distant (zmedian = 0.93) massive galaxy clusters from the South Pole Telescope Sunyaev–Zel’dovich (SPT-SZ) Survey, measuring galaxy shapes in …
View article: Testing the accuracy of 3D-<i>HST</i> photometric redshift estimates as reference samples for deep weak lensing studies
Testing the accuracy of 3D-<i>HST</i> photometric redshift estimates as reference samples for deep weak lensing studies Open
Accurate weak lensing mass estimates of clusters are needed to calibrate mass proxies for the cosmological exploitation of galaxy cluster surveys. Such measurements require accurate knowledge of the redshift distribution of the weak lensin…
View article: Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data
Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data Open
Here, we present weak lensing (WL) mass constraints for a sample of massive galaxy clusters detected by the South Pole Telescope (SPT) via the Sunyaev-Zel'dovich effect (SZE). We use griz imaging data obtained from the Science Verification…
View article: Sunyaev–Zel’dovich effect and X-ray scaling relations from weak lensing mass calibration of 32 South Pole Telescope selected galaxy clusters
Sunyaev–Zel’dovich effect and X-ray scaling relations from weak lensing mass calibration of 32 South Pole Telescope selected galaxy clusters Open
© 2018 The Author(s). Uncertainty in mass-observable scaling relations is currently the limiting factor for galaxycluster-based cosmology. Weak gravitational lensing can provide direct mass calibration and reduce the mass uncertainty. We p…
View article: Galaxy kinematics and mass calibration in massive SZE-selected galaxy clusters to<i>z</i> = 1.3
Galaxy kinematics and mass calibration in massive SZE-selected galaxy clusters to<i>z</i> = 1.3 Open
The galaxy phase-space distribution in galaxy clusters provides insights into the formation and evolution of cluster galaxies, and it can also be used to measure cluster mass profiles. We present a dynamical study based on ~3000 passive, n…
View article: The relative impact of baryons and cluster shape on weak lensing mass estimates of galaxy clusters
The relative impact of baryons and cluster shape on weak lensing mass estimates of galaxy clusters Open
Weak gravitational lensing depends on the integrated mass along the line of sight. Baryons contribute to the mass distribution of galaxy clusters and the resulting mass estimates from lensing analysis. We use the cosmo-OWLS suite of hydrod…
View article: Prospects for Determining the Mass Distributions of Galaxy Clusters on Large Scales Using Weak Gravitational Lensing
Prospects for Determining the Mass Distributions of Galaxy Clusters on Large Scales Using Weak Gravitational Lensing Open
For more than two decades, the Navarro, Frenk, and White (NFW) model has stood the test of time; it has been used to describe the distribution of mass in galaxy clusters out to their outskirts. Stacked weak lensing measurements of clusters…
View article: Cluster mass calibration at high redshift: HST weak lensing analysis of 13 distant galaxy clusters from the South Pole Telescope Sunyaev–Zel'dovich Survey
Cluster mass calibration at high redshift: HST weak lensing analysis of 13 distant galaxy clusters from the South Pole Telescope Sunyaev–Zel'dovich Survey Open
We present an HST/ACS weak gravitational lensing analysis of 13 massive high-redshift (z_median=0.88) galaxy clusters discovered in the South Pole Telescope (SPT) Sunyaev-Zel'dovich Survey. This study is part of a larger campaign that aims…
View article: STAR-FORMING BRIGHTEST CLUSTER GALAXIES AT 0.25 < z < 1.25: A TRANSITIONING FUEL SUPPLY
STAR-FORMING BRIGHTEST CLUSTER GALAXIES AT 0.25 < z < 1.25: A TRANSITIONING FUEL SUPPLY Open
We present a multiwavelength study of the 90 brightest cluster galaxies (BCGs) in a sample of galaxy clusters selected via the Sunyaev Zel'dovich effect by the South Pole Telescope, utilizing data from various ground- and space-based facil…
View article: Erratum: Weighing the giants – V. Galaxy cluster scaling relations
Erratum: Weighing the giants – V. Galaxy cluster scaling relations Open
We present constraints on the scaling relations of galaxy cluster X-ray luminosity, temperature and gas mass (and derived quantities) with mass and redshift, employing masses from robust weak gravitational lensing measurements. These are t…
View article: COSMOLOGICAL CONSTRAINTS FROM GALAXY CLUSTERS IN THE 2500 SQUARE-DEGREE SPT-SZ SURVEY
COSMOLOGICAL CONSTRAINTS FROM GALAXY CLUSTERS IN THE 2500 SQUARE-DEGREE SPT-SZ SURVEY Open
We present cosmological parameter constraints obtained from galaxy clusters identified by their Sunyaev–Zel’dovich effect signature in the 2500 square-degree South Pole Telescope Sunyaev Zel’dovich (SPT-SZ) survey. We consider the 377 clus…
View article: SPT-GMOS: A GEMINI/GMOS-SOUTH SPECTROSCOPIC SURVEY OF GALAXY CLUSTERS IN THE SPT-SZ SURVEY
SPT-GMOS: A GEMINI/GMOS-SOUTH SPECTROSCOPIC SURVEY OF GALAXY CLUSTERS IN THE SPT-SZ SURVEY Open
We present the results of SPT-GMOS, a spectroscopic survey with the Gemini Multi-Object Spectrograph (GMOS) on Gemini South. The targets of SPT-GMOS are galaxy clusters identified in the SPT-SZ survey, a millimeter-wave survey of 2500 deg …
View article: A series of shocks and edges in Abell 2219
A series of shocks and edges in Abell 2219 Open
Here, we present deep, 170 ks, Chandra X-ray observations of Abell 2219 (z = 0.23), one of the hottest and most X-ray luminous clusters known, and which is experiencing a major merger event. We discover a ‘horseshoe’ of high-temperature ga…
View article: SPT-GMOS: A Gemini/GMOS-South Spectroscopic Survey of Galaxy Clusters in the SPT-SZ Survey
SPT-GMOS: A Gemini/GMOS-South Spectroscopic Survey of Galaxy Clusters in the SPT-SZ Survey Open
We present the results of SPT-GMOS, a spectroscopic survey with the Gemini Multi-Object Spectrograph (GMOS) on Gemini South. The targets of SPT-GMOS are galaxy clusters identified in the SPT-SZ survey, a millimeter-wave survey of 2500 squ.…
View article: Weighing the giants– V. Galaxy cluster scaling relations
Weighing the giants– V. Galaxy cluster scaling relations Open
Here, we present constraints on the scaling relations of galaxy cluster X-ray luminosity, temperature and gas mass (and derived quantities) with mass and redshift, employing masses from robust weak gravitational lensing measurements. These…
View article: Detection of enhancement in number densities of background galaxies due to magnification by massive galaxy clusters
Detection of enhancement in number densities of background galaxies due to magnification by massive galaxy clusters Open
We present a detection of the enhancement in the number densities of background galaxies induced from lensing magnification and use it to test the Sunyaev–Zel'dovich effect (SZE-) inferred masses in a sample of 19 galaxy clusters with medi…
View article: Cosmology and astrophysics from relaxed galaxy clusters – IV. Robustly calibrating hydrostatic masses with weak lensing
Cosmology and astrophysics from relaxed galaxy clusters – IV. Robustly calibrating hydrostatic masses with weak lensing Open
This is the fourth in a series of papers studying the astrophysics and\ncosmology of massive, dynamically relaxed galaxy clusters. Here, we use\nmeasurements of weak gravitational lensing from the Weighing the Giants project\nto calibrate …
View article: DEEP<i>CHANDRA</i>,<i>HST</i>-COS, AND MEGACAM OBSERVATIONS OF THE PHOENIX CLUSTER: EXTREME STAR FORMATION AND AGN FEEDBACK ON HUNDRED KILOPARSEC SCALES
DEEP<i>CHANDRA</i>,<i>HST</i>-COS, AND MEGACAM OBSERVATIONS OF THE PHOENIX CLUSTER: EXTREME STAR FORMATION AND AGN FEEDBACK ON HUNDRED KILOPARSEC SCALES Open
Here, we present new ultraviolet, optical, and X-ray data on the Phoenix galaxy cluster (SPT-CLJ2344-4243). Deep optical imaging reveals previously undetected filaments of star formation, extending to radii of ~50-100 kpc in multiple direc…
View article: A series of shocks and edges in Abell 2219
A series of shocks and edges in Abell 2219 Open
We present deep, 170 ks, Chandra X-ray observations of Abell 2219 (z=0.23) one of the hottest and most X-ray luminous clusters known, and which is experiencing a major merger event. We discover a 'horseshoe' of high temperature gas surroun…
View article: GALAXY CLUSTERS DISCOVERED VIA THE SUNYAEV-ZEL'DOVICH EFFECT IN THE 2500-SQUARE-DEGREE SPT-SZ SURVEY
GALAXY CLUSTERS DISCOVERED VIA THE SUNYAEV-ZEL'DOVICH EFFECT IN THE 2500-SQUARE-DEGREE SPT-SZ SURVEY Open
We present a catalog of galaxy clusters selected via their Sunyaev-Zel'dovich\n(SZ) effect signature from 2500 deg$^2$ of South Pole Telescope (SPT) data.\nThis work represents the complete sample of clusters detected at high\nsignificance…