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…

The Lyman- α forest from LBGs: First 3D correlation measurement with DESI and prospects for cosmology Open

H. K. Herrera-Alcantar, E. Armengaud, Christophe Yèche, Calum Gordon, Laura Casas , et al. · 2025

The Lyman- α (Ly α ) forest is a key tracer of large-scale structure at redshifts z > 2, traditionally studied using the spectra of luminous but relatively rare quasars. In this work, we explore the viability of using the fainter yet signi…

The Dark Matter Content of Milky Way Dwarf Spheroidal Galaxies: Draco, Sextans, and Ursa Minor Open

Hao Yang, Wenting Wang, Ling Zhu, Ting S. Li, S. E. Koposov , et al. · 2025

The Milky Way Survey of the Dark Energy Spectroscopic Instrument (DESI) has so far observed three classical dwarf spheroidal galaxies (dSphs): Draco, Sextans, and Ursa Minor. Based on the observed line-of-sight velocities and metallicities…

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…

Modeling of the high column density systems in the Lyman-Alpha forest Open

T. Tan, J. Rich, E. Chaussidon, J.M Le Gof, C Balland , et al. · 2025

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…

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…

Spectroscopic Characterization of redMaPPer Galaxy Clusters with DESI Open

J. Myles, D. Gruen, T Jeltema, Shaojun Fu, S. W. Allen , et al. · 2025

Physics Materials science

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…

Validation of the DESI-DR1 3x2-pt analysis: scale cut and shear ratio tests Open

N Emas, A. Porredon, Chris Blake, J Derose, J. Aguilar , et al. · 2025

Combined survey analyses of galaxy clustering and weak gravitational lensing (3x2-pt studies) will allow new and accurate tests of the standard cosmological model. However, careful validation is necessary to ensure that these cosmological …

Testing gravitational physics by combining DESI DR1 and weak lensing datasets using the E_G estimator Open

S.J Rauhut, Christine E. Blake, U. Andrade, H. E. Noriega, José Aguilar , et al. · 2025

The action of gravitational physics across space-time creates observable signatures in the behaviour of light and matter. We perform combined-probe studies using data from the Baryon Oscillation Spectroscopic Survey (BOSS) and Dark Energy …

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…

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…

Clustering analysis of medium-band selected high-redshift galaxies Open

Haruki Ebina, Martin White, Anand Raichoor, Arjun Dey, David J. Schlegel , et al. · 2025

Next-generation large-scale structure spectroscopic surveys will probe cosmology at high redshifts $(2.3 < z < 3.5)$, relying on abundant galaxy tracers such as Ly$α$ emitters (LAEs) and Lyman break galaxies (LBGs). Medium-band photometry …

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.

Dwarf galaxy halo masses from spectroscopic and photometric lensing in DESI and DES Open

Helena Treiber, A. Amon, Risa H. Wechsler, Viraj Manwadkar, J. Myles , et al. · 2025

We present the most precise and lowest-mass weak lensing measurements of dwarf galaxies to date, enabled by spectroscopic lenses from the Dark Energy Spectroscopic Instrument (DESI) and photometric lenses from the Dark Energy Survey (DES) …

Model-independent measurement of the matter-radiation equality scale in DESI 2024 Open

Benedict Bahr-Kalus, David Parkinson, K. Lodha, E. Müeller, E. Chaussidon , et al. · 2025

The peak of the matter power spectrum, known as the turnover (TO) scale, is determined by the horizon size at the time of matter-radiation equality. This scale can serve as a standard ruler, independent of other features in the matter powe…

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_…

DESI DR1 Ly$α$ 1D power spectrum: Validation of estimators Open

Naim Göksel Karaçaylı, C. Ravoux, Paul Martini, Jean-Marc Le Goff, E. Armengaud , et al. · 2025

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_…

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 …

DESI 2024 V: Full-Shape galaxy clustering from galaxies and quasars Open

A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2025

Physics Computer science

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…

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…

Measurement of Parity-Violating Modes of the Dark Energy Spectroscopic Instrument (DESI) Year 1 Luminous Red Galaxies' 4-Point Correlation Function Open

Zachary Slepian, Alex Krolewski, Alessandro Greco, Simon May, William Ortoláleonard , et al. · 2025

Here we report the first measurement of the parity-violating (PV) 4-Point Correlation Function (4PCF) of the Dark Energy Spectroscopic Instrument's Year 1 Luminous Red Galaxy (DESI Y1 LRG) sample, motivated by the potential detection of th…

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…

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