Explanipedia

DESI Spectroscopy of HETDEX Emission-line Candidates. I. Line Discrimination Validation Open

Martin Landriau, Erin Mentuch Cooper, Dustin Davis, Karl Gebhardt, Robin Ciardullo , et al. · 2025

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…

ODIN: Probing the LAE Ly α Luminosity Function across Cosmic Time and Different Environments Open

Gautam Nagaraj, Robin Ciardullo, C. Gronwall, Vandana Ramakrishnan, Kyoung-Soo Lee , et al. · 2025

The ubiquity and relative ease of discovery make 2 ≲ z ≲ 5 Ly α emitting galaxies (LAEs) ideal tracers for large-scale structure of the distant Universe. In addition, because Ly α is a resonance line, but frequently observed at large equiv…

Modelling the impact of quasar redshift errors on the full-shape analysis of correlations in the Lyman-α forest Open

C. Gordon, Andrei Cuceu, Andreu Font-Ribera, H. K. Herrera-Alcantar, Jessica Nicole Aguilar Steven Ahlen , et al. · 2025

In preparation for the first cosmological measurements from the full shape of the Lyman-$\alpha$ (Ly $\alpha$) forest from Dark Energy Spectroscopic Instrument (DESI), we must carefully model all relevant systematics that might bias our an…

Enhancing DESI DR1 full-shape analyses using HOD-informed priors Open

Hanyu Zhang, Marco Bonici, A. Rocher, Will J. Percival, Arnaud de Mattia , et al. · 2025

We present an analysis of DESI Data Release 1 (DR1) that incorporates Halo Occupation Distribution (HOD)-informed priors into Full-Shape (FS) modeling of the power spectrum based on cosmological perturbation theory (PT). By leveraging phys…

DESI DR1 Ly α 1D power spectrum: the Fast Fourier Transform estimator measurement Open

C. Ravoux, M. Abdul-Karim, Jean-Marc Le Goff, E. Armengaud, José Aguilar , et al. · 2025

Mathematics Physics

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…

A joint analysis of 3D clustering and galaxy × CMB-lensing cross-correlations with DESI DR1 galaxies Open

Michael Maus, Martin White, Noah Sailer, Antón Baleato Lizancos, S Ferraro , et al. · 2025

The spectroscopic data from DESI Data Release 1 (DR1) galaxies enables the analysis of 3D clustering by fitting galaxy power spectra and reconstructed correlation functions in redshift space. Given low measurements of the amplitude of stru…

Astropianist/LumFuncMCMC: Narrow Band Luminosity Function Open

Gautam Nagaraj, Robin Ciardullo, C. Gronwall, Vandana Ramakrishnan, Kyoung-Soo Lee , et al. · 2025

Although focused on the ODIN survey, this Python-based code enables users to calculate the luminosity functions of emission lines based on narrow-band surveys. It provides two methods to calculate the luminosity function, which have been s…

Detection of supernova magnitude fluctuations induced by large-scale structure Open

Angie Nguyen, Chris Blake, R Turner, V Aronica, Julian Bautista , et al. · 2025

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…

DESI Emission-line Galaxies: Clustering Dependence on Stellar Mass and [O II] Luminosity Open

T. W. Hagen, K. S. Dawson, Zheng Zheng, J. Aguilar, S. P. Ahlen , et al. · 2025

We measure the projected two-point correlation functions of emission-line galaxies (ELGs) from the Dark Energy Spectroscopic Instrument One-Percent Survey and model their dependence on stellar mass and [O II ] luminosity. We select ∼180,00…

Extended dark energy analysis using DESI DR2 BAO measurements Open

K. Lodha, R. Calderón, William L. Matthewson, Arman Shafieloo, M. Ishak , et al. · 2025

We conduct an extended analysis of dark energy constraints, in support of the findings of the Dark Energy Spectroscopic Instrument (DESI) second data release cosmology key paper, including DESI data, Planck cosmic microwave background obse…

Using active learning to improve quasar identification for the DESI spectra processing pipeline Open

D. Green, David Kirkby, J. Aguilar, S. P. Ahlen, D. M. Alexander , et al. · 2025

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…

Cosmology from Planck CMB lensing and DESI DR1 quasar tomography Open

Roger de Belsunce, Alex Krolewski, E. Chaussidon, Simone Ferraro, Gerrit S. Farren , et al. · 2025

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 …

DESI DR1 Lyα 1D power spectrum: the optimal estimator measurement Open

Naim Göksel Karaçaylı, Paul Martini, J. Aguilar, S. P. Ahlen, E. Armengaud , et al. · 2025

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…

Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO Open

E. Chaussidon, Martin White, Arnaud de Mattia, Rafaela Gsponer, S. P. Ahlen , et al. · 2025

Supplementary material to DESI's publication 'Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO' to comply with the data management plan.

DESI Strong Lens Foundry II: DESI Spectroscopy for Strong Lens Candidates Open

Xiaosheng Huang, Jose Carlos Inchausti, Christopher Storfer, S. Tabares-Tarquinio, John Moustakas , et al. · 2025

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…

DESI DR1 Ly$α$ forest: 3D full-shape analysis and cosmological constraints Open

Andrei Cuceu, H. K. Herrera-Alcantar, C. Gordon, C. Ramírez-Pérez, E. Armengaud , et al. · 2025

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…

The Cosmic Evolution of CIV Absorbers at 1.4 < z < 4.5 : Insights from 100,000 Systems in DESI Quasars Open

Abhijeet Anand, José Aguilar, S. P. Ahlen, D. Bianchi, A. Brodzeller , et al. · 2025

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_…

Fiducial-Cosmology-dependent systematics for the DESI 2024 Full-Shape Analysis Open

Rafaela Gsponer, S. Ramírez-Solano, Frank Rodriguez-Martinez, M. Vargas-Magaña, Sergi Novell-Masot , et al. · 2025

We assess the impact of the fiducial cosmology choice on cosmological inference from full-shape (FS) fits of the galaxy power spectrum in the DESI 2024 Data Release 1 (DR1). Using a suite of AbacusSummit DR1 mock catalogues based on the Pl…

The Cosmic Evolution of C IV Absorbers at 1.4 < z < 4.5: Insights from 100,000 Systems in DESI Quasars Open

Abhijeet Anand, J. Aguilar, S. P. Ahlen, D. Bianchi, A. Brodzeller , et al. · 2025

Physics

We present the largest catalog to date of triply ionized carbon (C iv ) absorbers detected in quasar spectra from the Dark Energy Spectroscopic Instrument. Using an automated matched-kernel convolution method with adaptive signal-to-noise …

Exploring HOD-dependent systematics for the DESI 2024 Full-Shape galaxy clustering analysis Open

N. Findlay, S. Nadathur, W.J Percival, Arnaud de Mattia, Pauline Zarrouk , et al. · 2025

Physics Computer science Biology

We analyse the robustness of the DESI 2024 cosmological inference from the full shape of the galaxy power spectrum to uncertainties in the Halo Occupation Distribution (HOD) model of the galaxy-halo connection and the choice of priors on n…

Modified gravity constraints from the full shape modeling of clustering measurements from DESI 2024 Open

Mustapha Ishak, Jian Pan, R. Calderón, K. Lodha, Georgios Valogiannis , et al. · 2025

Computer science Mathematics

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…

DESI DR1 Lyα 1D power spectrum: The optimal estimator measurement Open

Naim Göksel Karaçaylı, Paul Martini, José Aguilar, S. P. Ahlen, E. Armengaud , et al. · 2025

Supplementary material to DESI's publication DESI DR1 Lyα 1D power spectrum: The optimal estimator measurement from DESI’s first-year quasar sample to comply with the data management plan. You can read these files using astrop.io.ascii.rea…

SpecDis: Value Added Distance Catalog for 4 Million Stars from DESI Year-1 Data Open

Songting Li, Wenting Wang, S. E. Koposov, Ting S. Li, Youjia Wu , et al. · 2025

Physics Computer science

We present the S pec D is value-added stellar distance catalog accompanying DESI Data Release 1. S pec D is trains a feed-forward neural network (NN) with Gaia parallaxes and gets the distance estimates. To build up an unbiased training sa…

Missing components in ΛCDM from DESI Y1 baryonic acoustic oscillation measurements: Insights from redshift remapping Open

E. Fernández-García, Radosław Wojtak, Francisco Prada, Jorge L. Cervantes–Cota, O. Alves , et al. · 2025

Physics Biology

Aims. We explore transformations of the Friedman-Lemaître-Robertson-Walker (FLRW) metric and cosmological parameters that align with observational data while aiming to gain insights into potential extensions of standard cosmological models…

The Compilation and Validation of the Spectroscopic Redshift Catalogs for the DESI-COSMOS and DESI-XMMLSS Fields Open

J Ratajczak, Kyle Dawson, N Weaverdyck, José Aguilar, S. P. Ahlen , et al. · 2025

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…

Combined tracer analysis for DESI 2024 BAO Open

D. Valcin, M. Rashkovetskyi, Hee‐Jong Seo, Florian Beutler, Peter McDonald , et al. · 2025

This paper demonstrates how the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) and future baryon acoustic oscillations (BAO) analyses can optimally combine overlapping tracers (galaxies of distinct types) in the same reds…

Constraints on neutrino physics from DESI DR2 BAO and DR1 full shape Open

Willem Elbers, Alejandro Avilés, H. E. Noriega, D. Chebat, A. Menegas , et al. · 2025

The Dark Energy Spectroscopic Instrument (DESI) Collaboration has obtained robust measurements of baryon acoustic oscillations in the redshift range 0.1 < z < 4.2 , based on the Lyman- α forest and galaxies from data release 2. We comb…

Measurements of the thermal Sunyaev-Zel’dovich effect with ACT and DESI luminous red galaxies Open

R. Henry Liu, Simone Ferraro, Emmanuel Schaan, Rongpu Zhou, J. Aguilar , et al. · 2025

Physics

International audience

Exploring the interaction between the MW and LMC with a large sample of blue horizontal branch stars from the DESI survey Open

Amanda Byström, S. E. Koposov, Sophia Lilleengen, Ting S. Li, Eric F. Bell , et al. · 2025

Physics

The Large Magellanic Cloud (LMC) is a Milky Way (MW) satellite that is massive enough to gravitationally attract the MW disc and inner halo, causing significant motion of the inner MW with respect to the outer halo. In this work, we probe …

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