E. Armengaud
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View article: DESI Spectroscopy of HETDEX Emission-line Candidates. I. Line Discrimination Validation
DESI Spectroscopy of HETDEX Emission-line Candidates. I. Line Discrimination Validation Open
The Hobby–Eberly Dark Energy Experiment (HETDEX) is an untargeted spectroscopic galaxy survey that uses Ly α- emitting galaxies (LAEs) as tracers of 1.9 < z < 3.5 large-scale structure. Most detections consist of a single emission line, wh…
View article: DESI DR1 Ly <i>α</i> 1D power spectrum: the Fast Fourier Transform estimator measurement
DESI DR1 Ly <i>α</i> 1D power spectrum: the Fast Fourier Transform estimator measurement Open
We present the one-dimensional Lyman- α forest power spectrum measurement derived from the data release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI). The measurement of the Lyman- α forest power spectrum along the line of sig…
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: 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: DESI DR1 Lyα 1D power spectrum: the optimal estimator measurement
DESI DR1 Lyα 1D power spectrum: the optimal estimator measurement Open
The one-dimensional power spectrum P 1D of Lyα forest offers rich insights into cosmological and astrophysical parameters, including constraints on the sum of neutrino masses, warm dark matter models, and the thermal state of the intergala…
View article: DESI DR1 Ly$α$ forest: 3D full-shape analysis and cosmological constraints
DESI DR1 Ly$α$ forest: 3D full-shape analysis and cosmological constraints Open
We perform an analysis of the full shapes of Lyman-$α$ (Ly$α$) forest correlation functions measured from the first data release (DR1) of the Dark Energy Spectroscopic Instrument (DESI). Our analysis focuses on measuring the Alcock-Paczyns…
View article: DESI DR1 Ly$α$ 1D power spectrum: Validation of estimators
DESI DR1 Ly$α$ 1D power spectrum: Validation of estimators Open
The Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI) is the largest sample to date for small-scale Ly$α$ forest cosmology, accessed through its one-dimensional power spectrum ($P_{\mathrm{1D}}$). The Ly$α$ forest $P_…
View article: DESI 2024 V: Full-Shape galaxy clustering from galaxies and quasars
DESI 2024 V: Full-Shape galaxy clustering from galaxies and quasars Open
We present the measurements and cosmological implications of the galaxy two-point clustering using over 4.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1 divided into six redshift bins over a ∼ 7,500 square degree f…
View article: The Compilation and Validation of the Spectroscopic Redshift Catalogs for the DESI-COSMOS and DESI-XMMLSS Fields
The Compilation and Validation of the Spectroscopic Redshift Catalogs for the DESI-COSMOS and DESI-XMMLSS Fields Open
Over several dedicated programs that include targets beyond the main cosmological samples, the Dark Energy Spectroscopic Instrument (DESI) collected spectra for 304,970 unique objects in two fields centered on the COSMOS and XMM-LSS fields…
View article: Cosmological neutrino mass: a frequentist overview in light of DESI
Cosmological neutrino mass: a frequentist overview in light of DESI Open
We derive constraints on the neutrino mass using a variety of recent cosmological datasets, including DESI BAO, the full-shape analysis of the DESI matter power spectrum and the one-dimensional power spectrum of the Lyman-$α$ forest (P1D) …
View article: Validation of the DESI DR2 measurements of baryon acoustic oscillations from galaxies and quasars
Validation of the DESI DR2 measurements of baryon acoustic oscillations from galaxies and quasars Open
The Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2) galaxy and quasar clustering data represents a significant expansion of data from Data Release 1 (DR1), providing improved statistical precision in baryon acoustic oscill…
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 reconstruct o…
View article: DESI 2024 VII: cosmological constraints from the full-shape modeling of clustering measurements
DESI 2024 VII: cosmological constraints from the full-shape modeling of clustering measurements Open
We present cosmological results from the measurement of clustering of galaxy, quasar and Lyman-α forest tracers from the first year of observations with the Dark Energy Spectroscopic Instrument (DESI Data Release 1). We adopt the full-shap…
View article: DESI 2024 II: sample definitions, characteristics, and two-point clustering statistics
DESI 2024 II: sample definitions, characteristics, and two-point clustering statistics Open
We present the samples of galaxies and quasars used for DESI 2024 cosmological analyses, drawn from the DESI Data Release 1 (DR1). We describe the construction of large-scale structure (LSS) catalogs from these samples, which include match…
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…
Emulating the Lyman-Alpha forest 1D power spectrum from cosmological simulations: new models and constraints from the eBOSS measurement Open
We present the Lyssa suite of high-resolution cosmological simulations of the Lyman- α forest designed for cosmological analyses. These 18 simulations have been run using the Nyx code with 4096 3 hydrodynamical cells in a 120 Mpc (∼ 81 Mpc…
View article: DESI 2024 III: baryon acoustic oscillations from galaxies and quasars
DESI 2024 III: baryon acoustic oscillations from galaxies and quasars Open
We present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1. Divided by tracer type, we utilize 300,017 galaxies from the m…
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…
View article: Validation of the DESI DR2 Measurements of Baryon Acoustic Oscillations from Galaxies and Quasars
Validation of the DESI DR2 Measurements of Baryon Acoustic Oscillations from Galaxies and Quasars Open
The Dark Energy Spectroscopic Instrument (DESI) data release 2 (DR2) galaxy and quasar clustering data represents a significant expansion of data from DR1, providing improved statistical precision in BAO constraints across multiple tracers…
View article: Characterization of contaminants in the Lyman-alpha forest auto-correlation with DESI
Characterization of contaminants in the Lyman-alpha forest auto-correlation with DESI Open
Baryon Acoustic Oscillations can be measured with sub-percent precision above redshift two with the Lyman- α (Ly α ) forest auto-correlation and its cross-correlation with quasar positions. This is one of the key goals of the Dark Energy S…
View article: Validation of the DESI 2024 Lyα forest BAO analysis using synthetic datasets
Validation of the DESI 2024 Lyα forest BAO analysis using synthetic datasets Open
The first year of data from the Dark Energy Spectroscopic Instrument (DESI) contains the largest set of Lyman- α (Ly α ) forest spectra ever observed. This data, collected in the DESI Data Release 1 (DR1) sample, has been used to measure t…
View article: Synthetic spectra for Lyman-α forest analysis in the Dark Energy Spectroscopic Instrument
Synthetic spectra for Lyman-α forest analysis in the Dark Energy Spectroscopic Instrument Open
Synthetic data sets are used in cosmology to test analysis procedures, to verify that systematic errors are well understood and to demonstrate that measurements are unbiased. In this work we describe the methods used to generate synthetic …
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 $0.1
View article: The ACCEL2 project: Simulating Lyman-α forest in large-volume hydrodynamical simulations
The ACCEL2 project: Simulating Lyman-α forest in large-volume hydrodynamical simulations Open
Cosmological information is usually extracted from the Lyman-α (Lyα) forest correlations using only either large-scale information interpreted through linear theory or using small-scale information interpreted by means of expensive hydrody…
CMB lensing and forest cross bispectrum from DESI’s first-year quasar sample Open
The squeezed cross-bispectrum Bκ,Lyα between the gravitational lensing in the cosmic microwave background and the 1D Lyα forest power spectrum can constrain bias parameters and break degeneracies between σ8 and other cosmological parameter…
High redshift LBGs from deep broadband imaging for future spectroscopic surveys Open
Lyman break galaxies (LBGs) are promising probes for clustering measurements at high redshift, z > 2, a region only covered so far by Lyman- α forest measurements. In this paper, we investigate the feasibility of selecting LBGs by exploiti…
View article: The Early Data Release of the Dark Energy Spectroscopic Instrument
The Early Data Release of the Dark Energy Spectroscopic Instrument Open
The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This pape…
View article: The ACCEL$^2$ project: simulating Lyman-$α$ forest in large-volume hydrodynamical simulations
The ACCEL$^2$ project: simulating Lyman-$α$ forest in large-volume hydrodynamical simulations Open
Cosmological information is usually extracted from the Lyman-$α$ forest correlations using only either large-scale information interpreted through linear theory or using small-scale information interpreted by means of expensive hydrodynami…
CMB lensing and Ly\alpha\ forest cross bispectrum from DESI's first-year quasar sample Open
The squeezed cross-bispectrum \bispeconed\ between the gravitational lensing in the Cosmic Microwave Background and the 1D \lya\ forest power spectrum can constrain bias parameters and break degeneracies between $\sigma_8$ and other cosmol…
Measurement of the small-scale 3D Lyman-α forest power spectrum Open
Small-scale correlations measured in the Lyman- α (Ly α ) forest encode information about the intergalactic medium and the primordial matter power spectrum. In this article, we present and implement a simple method to measure the 3-dimensi…