B. A. Weaver
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View article: The Multi-Phase Circumgalactic Medium of DESI Emission-Line Galaxies at z~1.5
The Multi-Phase Circumgalactic Medium of DESI Emission-Line Galaxies at z~1.5 Open
We study the multi-phase circumgalactic medium (CGM) of emission line galaxies (ELGs) at $z\sim1.5$, traced by MgII$\lambda2796$, $\lambda2803$ and CIV$\lambda1548$, $\lambda1550$ absorption lines, using approximately 7,000 ELG-quasar pair…
View article: Modeling of the high column density systems in the Lyman-Alpha forest
Modeling of the high column density systems in the Lyman-Alpha forest Open
The Lyman- α forests observed in the spectra of high-redshift quasars can be used as a tracer of the cosmological matter density to study baryon acoustic oscillations (BAO) and the Alcock-Paczynski effect. Extraction of cosmological inform…
View article: A Unified Photometric Redshift Calibration for Weak Lensing Surveys using the Dark Energy Spectroscopic Instrument
A Unified Photometric Redshift Calibration for Weak Lensing Surveys using the Dark Energy Spectroscopic Instrument Open
The effective redshift distribution $n(z)$ of galaxies is a critical component in the study of weak gravitational lensing. Here, we introduce a new method for determining $n(z)$ for weak lensing surveys based on high-quality redshifts and …
View article: A Comprehensive Characterization of Galaxy-cool CGM Connections at <i>z</i> < 0.4 with DESI Year 1 Data
A Comprehensive Characterization of Galaxy-cool CGM Connections at <i>z</i> < 0.4 with DESI Year 1 Data Open
We investigate the relationships between the cool circumgalactic medium (CGM), traced by Ca ii absorption lines, and galaxy properties at z < 0.4 using ∼900,000 galaxy–quasar pairs within 200 kpc from the Year 1 data of the Dark Energy Spe…
View article: Direct Measurement of Galaxy Assembly Bias using DESI DR1 Data
Direct Measurement of Galaxy Assembly Bias using DESI DR1 Data Open
We report the first direct measurement of galaxy assembly bias, a critical systematic in cosmology, from the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Survey. We introduce a novel, cosmology-independent method to measure th…
View article: Spectroscopic Characterization of redMaPPer Galaxy Clusters with DESI
Spectroscopic Characterization of redMaPPer Galaxy Clusters with DESI Open
Optical galaxy cluster identification algorithms such as redMaPPer promise to enable an array of astrophysical and cosmological studies, but suffer from biases whereby galaxies in front of and behind a galaxy cluster are mistakenly associa…
View article: Probing cosmic velocities with the pairwise kinematic Sunyaev-Zel'dovich signal in DESI Bright Galaxy Sample DR1 and ACT DR6
Probing cosmic velocities with the pairwise kinematic Sunyaev-Zel'dovich signal in DESI Bright Galaxy Sample DR1 and ACT DR6 Open
We present a measurement of the pairwise kinematic Sunyaev-Zel'dovich (kSZ) signal using the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Sample (BGS) Data Release 1 (DR1) galaxy sample overlapping with the Atacama Cosmology T…
View article: Detection of supernova magnitude fluctuations induced by large-scale structure
Detection of supernova magnitude fluctuations induced by large-scale structure Open
The peculiar velocities of supernovae and their host galaxies are correlated with the large-scale structure of the Universe, and can be used to constrain the growth rate of structure and test the cosmological model. In this work, we measur…
View article: Using active learning to improve quasar identification for the DESI spectra processing pipeline
Using active learning to improve quasar identification for the DESI spectra processing pipeline Open
The Dark Energy Spectroscopic Instrument (DESI) survey uses an automatic spectral classification pipeline to classify spectra. QuasarNET is a convolutional neural network used as part of this pipeline originally trained using data from the…
View article: Cosmology from Planck CMB lensing and DESI DR1 quasar tomography
Cosmology from Planck CMB lensing and DESI DR1 quasar tomography Open
We present a measurement of the amplitude of matter fluctuations over the redshift range 0.8 ≤ z ≤ 3.5 from the cross correlation of over 1.2 million spectroscopic quasars selected by the Dark Energy Spectroscopic Instrument (DESI) across …
View article: DESI Strong Lens Foundry II: DESI Spectroscopy for Strong Lens Candidates
DESI Strong Lens Foundry II: DESI Spectroscopy for Strong Lens Candidates Open
We present the Dark Energy Spectroscopic Instrument (DESI) Strong Lensing Secondary Target Program. This is a spectroscopic follow-up program for strong gravitational lens candidates found in the DESI Legacy Imaging Surveys footprint. Spec…
View article: The Cosmic Evolution of CIV Absorbers at 1.4 < z < 4.5 : Insights from 100,000 Systems in DESI Quasars
The Cosmic Evolution of CIV Absorbers at 1.4 < z < 4.5 : Insights from 100,000 Systems in DESI Quasars Open
Update (v3)In version 2, the file Fig10_planck18_Omega_CIV_absorbers.h5 was mistakenly carried over from v1 and did not correspond to the data shown in the published paper. This version (v3) corrects that error. The updated Fig10_planck18_…
View article: STag. II. Classification of Serendipitous Supernovae Observed by Galaxy Redshift Surveys
STag. II. Classification of Serendipitous Supernovae Observed by Galaxy Redshift Surveys Open
With the number of supernovae observed expected to drastically increase thanks to large-scale surveys like the Dark Energy Spectroscopic Instrument (DESI), it is necessary that the tools we use to classify these objects keep up with this i…
View article: Modified gravity constraints from the full shape modeling of clustering measurements from DESI 2024
Modified gravity constraints from the full shape modeling of clustering measurements from DESI 2024 Open
We present cosmological constraints on deviations from general relativity (GR) from the first-year of clustering observations from the Dark Energy Spectroscopic Instrument (DESI) in combination with other available datasets including the C…
View article: The effects of continuum fitting on Lyman-α forest correlations
The effects of continuum fitting on Lyman-α forest correlations Open
Correlations of fluctuations of the flux in Lyman-α forests of high-redshift quasars have been observed by the Baryonic Acoustic Oscillation Spectroscopy Survey (BOSS) and the Dark Energy Spectroscopy Instrument (DESI) survey where they ha…
View article: Clustering of DESI galaxies split by thermal Sunyaev-Zeldovich effect
Clustering of DESI galaxies split by thermal Sunyaev-Zeldovich effect Open
The thermal Sunyaev-Zeldovich (tSZ) effect is associated with galaxy clusters - extremely large and dense structures tracing the dark matter with a higher bias than isolated galaxies. We propose to use the tSZ data to separate galaxies fro…
View article: The Compilation and Validation of the Spectroscopic Redshift Catalogs for the DESI-COSMOS and DESI-XMMLSS Fields
The Compilation and Validation of the Spectroscopic Redshift Catalogs for the DESI-COSMOS and DESI-XMMLSS Fields Open
Over several dedicated programs that include targets beyond the main cosmological samples, the Dark Energy Spectroscopic Instrument (DESI) collected spectra for 304,970 unique objects in two fields centered on the COSMOS and XMM-LSS fields…
View article: Construction of the damped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>Ly</mml:mi> <mml:mi>α</mml:mi> </mml:mrow> </mml:math> absorber catalog for DESI DR2 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mrow> <mml:mrow> <mml:mi>Ly</mml:mi> <mml:mi>α</mml:mi> </mml:mrow> </mml:mrow> </mml:mrow> </mml:math> BAO
Construction of the damped absorber catalog for DESI DR2 BAO Open
We present the Damped Ly α Toolkit for automated detection and characterization of damped Ly α absorbers (DLAs) in quasar spectra. Our method uses quasar spectral templates with and without absorption from intervening DLAs to recon…
View article: Mitigating imaging systematics for DESI 2024 emission Line Galaxies and beyond
Mitigating imaging systematics for DESI 2024 emission Line Galaxies and beyond Open
Emission Line Galaxies (ELGs) are one of the main tracers that the Dark Energy Spectroscopic Instrument (DESI) uses to probe the universe. However, they are afflicted by strong spurious correlations between target density and observing con…
View article: Lensing Without Borders: Measurements of galaxy-galaxy lensing and projected galaxy clustering in DESI DR1
Lensing Without Borders: Measurements of galaxy-galaxy lensing and projected galaxy clustering in DESI DR1 Open
We present Galaxy-Galaxy Lensing measurements obtained by cross-correlating spectroscopically observed galaxies from the first data release of the Dark Energy Spectroscopic Instrument (DESI) with source galaxies from the Hyper Suprime-Cam …
View article: Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data
Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data Open
We report cosmological results from the Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) when combined with recent data from the Atacama Cosmology Telescope (ACT). By jointly analyzing ACT and …
View article: The Backup Program of the Dark Energy Spectroscopic Instrument's Milky Way Survey
The Backup Program of the Dark Energy Spectroscopic Instrument's Milky Way Survey Open
The Milky Way Backup Program (MWBP), a survey currently underway with the Dark Energy Spectroscopic Instrument (DESI) on the Nicholas U. Mayall 4-m Telescope, works at the margins of the DESI Main surveys to obtain spectra of millions of a…
View article: DESI Data Release 1: Stellar Catalogue
DESI Data Release 1: Stellar Catalogue Open
In this paper we present the stellar Value-Added Catalogue (VAC) based on the DESI Data Release 1. This VAC contains stellar parameter, abundance and radial velocity measurements for more than 4 million stars. It also contains, for the fir…
View article: Constraints on primordial non-Gaussianity from the cross-correlation of DESI luminous red galaxies and <i>Planck</i> CMB lensing
Constraints on primordial non-Gaussianity from the cross-correlation of DESI luminous red galaxies and <i>Planck</i> CMB lensing Open
Aims. We use the angular cross-correlation between a luminous red galaxy (LRG) sample from the Dark Energy Spectroscopic Instrument (DESI) Legacy Survey data release DR9 and the Planck cosmic microwave background (CMB) lensing maps to cons…
View article: Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data
Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data Open
We report cosmological results from the Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) when combined with recent data from the Atacama Cosmology Telescope (ACT). By jointly analyzing ACT and …
View article: Characterization of DESI fiber assignment incompleteness effect on 2-point clustering and mitigation methods for DR1 analysis
Characterization of DESI fiber assignment incompleteness effect on 2-point clustering and mitigation methods for DR1 analysis Open
We present an in-depth analysis of the fiber assignment incompleteness in the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1). This incompleteness is caused by the restricted mobility of the robotic fiber positioner in the…
View article: The rate of extreme coronal line emitters in the Baryon Oscillation Spectroscopic Survey LOWZ sample
The rate of extreme coronal line emitters in the Baryon Oscillation Spectroscopic Survey LOWZ sample Open
Extreme coronal line emitters (ECLEs) are a rare class of galaxy that exhibit strong, high-ionization iron coronal emission lines in their spectra. In some cases, these lines are transient and may be the result of tidal disruption event (T…
View article: Missing Components in ΛCDM from DESI Y1 BAO Measurements: Insights from Redshift Remapping
Missing Components in ΛCDM from DESI Y1 BAO Measurements: Insights from Redshift Remapping Open
We explore transformations of the Friedman-Lemaître-Robertson-Walker (FLRW) metric and cosmological parameters that align with observational data, aiming to gain insights into potential extensions of standard cosmological models. We modify…
View article: Updated cosmological constraints on axion dark energy with DESI
Updated cosmological constraints on axion dark energy with DESI Open
We present updated constraints on the parameters of an axion dark energy model, for which we took into account the properties of its characteristic potential and its full cosmological evolution. We show that the values of the axion paramet…
View article: Validation of the DESI DR2 Ly$\alpha$ BAO analysis using synthetic datasets
Validation of the DESI DR2 Ly$\alpha$ BAO analysis using synthetic datasets Open
The second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI), containing data from the first three years of observations, doubles the number of Lyman-$\alpha$ (Ly$\alpha$) forest spectra in DR1 and it provides the large…