E. Buckley‐Geer
YOU?
Author Swipe
View article: DESI 2024 V: Full-Shape galaxy clustering from galaxies and quasars
DESI 2024 V: Full-Shape galaxy clustering from galaxies and quasars Open
We present the measurements and cosmological implications of the galaxy two-point clustering using over 4.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1 divided into six redshift bins over a ∼ 7,500 square degree f…
View article: TDCOSMO 2025: Cosmological constraints from strong lensing time delays
TDCOSMO 2025: Cosmological constraints from strong lensing time delays Open
We present cosmological constraints from 8 strongly lensed quasars (hereafter, the TDCOSMO-2025 sample). Building on previous work, our analysis incorporated new deflector stellar velocity dispersions measured from spectra obtained with th…
View article: Full-Shape analysis of the power spectrum and bispectrum of DESI DR1 LRG and QSO samples
Full-Shape analysis of the power spectrum and bispectrum of DESI DR1 LRG and QSO samples Open
We present the first joint analysis of the power spectrum and bispectrum using the Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI), focusing on Luminous Red Galaxies (LRGs) and quasars (QSOs) across a redshift range…
View article: DESI DR2 results. II. Measurements of baryon acoustic oscillations and cosmological constraints
DESI DR2 results. II. Measurements of baryon acoustic oscillations and cosmological constraints Open
We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), based on three years of operation. For cosmology infe…
View article: TDCOSMO
TDCOSMO Open
We present new time delays, the main ingredient of time delay cosmography, for 22 lensed quasars resulting from high-cadence r -band monitoring on the 2.6 m ESO VLT Survey Telescope and Max-Planck-Gesellschaft 2.2 m telescope. Each lensed …
View article: DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest
DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest Open
We present the Baryon Acoustic Oscillation (BAO) measurements with the Lyman-alpha (LyA) forest from the second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI) survey. Our BAO measurements include both the auto-correl…
View article: DESI 2024 VI: cosmological constraints from the measurements of baryon acoustic oscillations
DESI 2024 VI: cosmological constraints from the measurements of baryon acoustic oscillations Open
We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman- α forest tracers from the first year of observations from the Dark Energy Spectroscopic Instrument (DESI), to be releas…
View article: Discovering Strong Gravitational Lenses in the Dark Energy Survey with Interactive Machine Learning and Crowd-sourced Inspection with Space Warps
Discovering Strong Gravitational Lenses in the Dark Energy Survey with Interactive Machine Learning and Crowd-sourced Inspection with Space Warps Open
We conduct a search for strong gravitational lenses in the Dark Energy Survey (DES) Year 6 imaging data. We implement a pre-trained Vision Transformer (ViT) for our machine learning (ML) architecture and adopt Interactive Machine Learning …
View article: The Dark Energy Survey Supernova Program: an updated measurement of the Hubble constant using the inverse distance ladder
The Dark Energy Survey Supernova Program: an updated measurement of the Hubble constant using the inverse distance ladder Open
We measure the current expansion rate of the Universe, Hubble’s constant $H_0$, by calibrating the absolute magnitudes of supernovae to distances measured by baryon acoustic oscillations (BAO). This ‘inverse distance ladder’ technique prov…
View article: Optimal reconstruction of baryon acoustic oscillations for DESI 2024
Optimal reconstruction of baryon acoustic oscillations for DESI 2024 Open
Baryon acoustic oscillations (BAO) provide a robust standard ruler to measure the expansion history of the Universe through galaxy clustering. Density-field reconstruction is now a widely adopted procedure for increasing the precision and …
View article: DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest
DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest Open
We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman- α (Ly α ) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Ly α …
Validating the galaxy and quasar catalog-level blinding scheme for the DESI 2024 analysis Open
In the era of precision cosmology, ensuring the integrity of data analysis through blinding techniques is paramount — a challenge particularly relevant for the Dark Energy Spectroscopic Instrument (DESI). DESI represents a monumental effor…
View article: Dark energy survey year 3 results: cosmology from galaxy clustering and galaxy–galaxy lensing in harmonic space
Dark energy survey year 3 results: cosmology from galaxy clustering and galaxy–galaxy lensing in harmonic space Open
We present the joint tomographic analysis of galaxy-galaxy lensing and galaxy clustering in harmonic space (HS), using galaxy catalogues from the first three years of observations by the Dark Energy Survey (DES Y3). We utilize the redMaGiC…
View article: The Dark Energy Survey Supernova Program: slow supernovae show cosmological time dilation out to <i>z</i> ~ 1.
The Dark Energy Survey Supernova Program: slow supernovae show cosmological time dilation out to <i>z</i> ~ 1. Open
We present a precise measurement of cosmological time dilation using the light curves of 1504 Type Ia supernovae from the Dark Energy Survey spanning a redshift range $0.1\lesssim z\lesssim 1.2$. We find that the width of supernova light c…
View article: TDCOSMO
TDCOSMO Open
Time-delay cosmography is a powerful technique to constrain cosmological parameters, particularly the Hubble constant ( H 0 ). The TDCOSMO Collaboration is performing an ongoing analysis of lensed quasars to constrain cosmology using this …
View article: The Dark Energy Survey Supernova Program: Slow supernovae show cosmological time dilation out to $z \sim 1$
The Dark Energy Survey Supernova Program: Slow supernovae show cosmological time dilation out to $z \sim 1$ Open
We present a precise measurement of cosmological time dilation using the light curves of 1504 type Ia supernovae from the Dark Energy Survey spanning a redshift range $0.1\lesssim z\lesssim 1.2$. We find that the width of supernova light c…
View article: TDCOSMO. XVI. Measurement of the Hubble Constant from the Lensed Quasar WGD$\,$2038$-$4008
TDCOSMO. XVI. Measurement of the Hubble Constant from the Lensed Quasar WGD$\,$2038$-$4008 Open
Time-delay cosmography is a powerful technique to constrain cosmological parameters, particularly the Hubble constant ($H_{0}$). The TDCOSMO collaboration is performing an ongoing analysis of lensed quasars to constrain cosmology using thi…
Validating the Galaxy and Quasar Catalog-Level Blinding Scheme for the DESI 2024 analysis Open
In the era of precision cosmology, ensuring the integrity of data analysis through blinding techniques is paramount -- a challenge particularly relevant for the Dark Energy Spectroscopic Instrument (DESI). DESI represents a monumental effo…
Optimal Reconstruction of Baryon Acoustic Oscillations for DESI 2024 Open
Baryon acoustic oscillations (BAO) provide a robust standard ruler to measure the expansion history of the Universe through galaxy clustering. Density-field reconstruction is now a widely adopted procedure for increasing the precision and …
Project Dinos I: A joint lensing–dynamics constraint on the deviation from the power law in the mass profile of massive ellipticals Open
The mass distribution in massive elliptical galaxies encodes their evolutionary history, thus providing an avenue to constrain the baryonic astrophysics in their evolution. The power-law assumption for the radial mass profile in elliptical…
View article: Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument
Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument Open
The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg 2 over 5 yr to constrain the cosmic expansion history through precise measurements of baryon acoustic oscillations (BAO). The scientific p…
Project Dinos I: A joint lensing-dynamics constraint on the deviation from the power law in the mass profile of massive ellipticals Open
The mass distribution in massive elliptical galaxies encodes their evolutionary history, thus providing an avenue to constrain the baryonic astrophysics in their evolution. The power-law assumption for the radial mass profile in elliptical…
View article: Identification of Galaxy–Galaxy Strong Lens Candidates in the DECam Local Volume Exploration Survey Using Machine Learning
Identification of Galaxy–Galaxy Strong Lens Candidates in the DECam Local Volume Exploration Survey Using Machine Learning Open
We perform a search for galaxy–galaxy strong lens systems using a convolutional neural network (CNN) applied to imaging data from the first public data release of the DECam Local Volume Exploration Survey, which contains ∼520 million astro…
View article: The Early Data Release of the Dark Energy Spectroscopic Instrument
The Early Data Release of the Dark Energy Spectroscopic Instrument Open
The Dark Energy Spectroscopic Instrument (DESI) completed its five-month Survey Validation in May 2021. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This p…
View article: Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument
Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument Open
The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg$^2$ over five years to constrain the cosmic expansion history through precise measurements of Baryon Acoustic Oscillations (BAO). The scie…
View article: The impact of human expert visual inspection on the discovery of strong gravitational lenses
The impact of human expert visual inspection on the discovery of strong gravitational lenses Open
We investigate the ability of human ‘expert’ classifiers to identify strong gravitational lens candidates in Dark Energy Survey like imaging. We recruited a total of 55 people that completed more than 25 per cent of the project. During the…
View article: Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and <i>Planck</i>. III. Combined cosmological constraints
Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and <i>Planck</i>. III. Combined cosmological constraints Open
We present cosmological constraints from the analysis of two-point correlation functions between galaxy positions and galaxy lensing measured in Dark Energy Survey (DES) Year 3 data and measurements of cosmic microwave background (CMB) len…
View article: The Robotic Multiobject Focal Plane System of the Dark Energy Spectroscopic Instrument (DESI)
The Robotic Multiobject Focal Plane System of the Dark Energy Spectroscopic Instrument (DESI) Open
A system of 5020 robotic fiber positioners was installed in 2019 on the Mayall Telescope, at Kitt Peak National Observatory. The robots automatically retarget their optical fibers every 10–20 minutes, each to a precision of several microns…
Dark Energy Survey Year 3 results: Cosmological constraints from galaxy clustering and galaxy-galaxy lensing using the MagLim lens sample Open
Two of the most sensitive probes of the large scale structure of the universe are the clustering of galaxies and the tangential shear of background galaxy shapes produced by those foreground galaxies, so-called galaxy-galaxy lensing. Combi…
LensingETC: A Tool to Optimize Multifilter Imaging Campaigns of Galaxy-scale Strong Lensing Systems Open
Imaging data is the principal observable required to use galaxy-scale strong lensing in a multitude of applications in extragalactic astrophysics and cosmology. In this paper, we develop Lensing Exposure Time Calculator (L ensing ETC; http…