Explanipedia

Galaxy-Multiplet Clustering from DESI DR2 Open

Hanyue Wang, Daniel J. Eisenstein, T. Claybaugh, Axel de la Macorra, P. Doel , et al. · 2025

We present an efficient estimator for higher-order galaxy clustering using small groups of nearby galaxies, or multiplets. Using the Luminous Red Galaxy (LRG) sample from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2, we i…

Effect of local environment on Ly$α$ line profile in DESI/ODIN LAEs Open

Ana Sofía M. Uzsoy, Anand Raichoor, Douglas P. Finkbeiner, Kyoung-Soo Lee, Eric Gawiser , et al. · 2025

Lyman-Alpha Emitters (LAEs) are star-forming galaxies with significant Ly$α$ emission and are often used as tracers of large-scale structure at high redshift. We explore the relationship between the Ly$α$ line profile and environmental den…

The Draco Dwarf Spheroidal Galaxy in the First Year of Dark Energy Spectroscopic Instrument Data Open

Jiani Ding, Constance M. Rockosi, S. E. Koposov, A. H. Riley, Wenting Wang , et al. · 2025

We investigate the spatial distribution, kinematics, and metallicity of stars in the Draco dwarf spheroidal galaxy using data from the Dark Energy Spectroscopic Instrument (DESI). We identify 155 high-probability members of Draco using lin…

Enhancing Multiplet Alignment Measurements with Imaging Open

Alexus Annika Kumwembe, Daniel J. Eisenstein, J. Aguilar, D. Bianchi, D. Brooks , et al. · 2025

We demonstrate that measurements of the gravitational tidal field made with spectroscopic redshifts can be improved with information from imaging surveys. The average orientation of small groups of galaxies, or “multiplets” is correlated w…

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…

The Multi-Phase Circumgalactic Medium of DESI Emission-Line Galaxies at z~1.5 Open

Ting-Wen Lan, J. X. Prochaska, J. Aguilar, S. Ahlen, A. Anand , et al. · 2025

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…

Quasars acting as Strong Lenses Found in DESI DR1 Open

Everett Mcarthur, Meredith C. Powell, Risa H. Wechsler, Zhiwei Pan, J. Spiller , et al. · 2025

Quasars acting as strong gravitational lenses offer a rare opportunity to probe the redshift evolution of scaling relations between supermassive black holes and their host galaxies, particularly the $M_{\mathrm{BH}}$--$M_{\mathrm{host}}$ r…

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

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…

A Comprehensive Characterization of Galaxy-cool CGM Connections at z < 0.4 with DESI Year 1 Data Open

Y. S. Ng, Ting-Wen Lan, J. X. Prochaska, A. Saintonge, Y. L. Chang , et al. · 2025

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…

AT2025ulz and S250818k: Leveraging DESI spectroscopy in the hunt for a kilonova associated with a sub-solar mass gravitational wave candidate Open

Xander J. Hall, A. Palmese, Brendan O’Connor, D. Gruen, Malte Busmann , et al. · 2025

On August 18th, 2025, the LIGO--Virgo--KAGRA collaboration reported a sub-threshold gravitational wave candidate detection consistent with a sub-solar-mass neutron star merger, denoted S250818k. An optical transient, AT2025ulz, was discove…

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…

Clustering of DESI galaxies split by thermal Sunyaev-Zeldovich effect Open

M. Rashkovetskyi, Daniel J. Eisenstein, J. Aguilar, S. P. Ahlen, Abhijeet Anand , et al. · 2025

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…

$H_0$ Without the Sound Horizon (or Supernovae): A 2% Measurement in DESI DR1 Open

E. A. Zaborowski, P. C. Taylor, Klaus Honscheid, Andrei Cuceu, Arnaud de Mattia , et al. · 2025

The sound horizon scale $r_s$ is a key source of information for early-time $H_0$ measurements, and is therefore a common target of new physics proposed to solve the Hubble tension. We present a sub-2% measurement of the Hubble constant th…

Enhancing Multiplet Alignment Measurements with Imaging Open

C. Lamman, S. P. Ahlen, Davide Bianchi, T. Claybaugh, Andrei Cuceu , et al. · 2025

We demonstrate that measurements of the gravitational tidal field made with spectroscopic redshifts can be improved with information from imaging surveys. The average orientation of small groups of galaxies, or "multiplets" is correlated w…

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…

Author Correction: Dynamical dark energy in light of the DESI DR2 baryonic acoustic oscillations measurements Open

Gangxu Gu, Xiaoma Wang, Yuting Wang, Gong‐Bo Zhao, Levon Pogosian , et al. · 2025

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…

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 …

Dark Energy Survey Year 6 results: cell-based coadds and metadetection weak lensing shape catalogue Open

M. Yamamoto, M. R. Becker, E. Sheldon, Mike Jarvis, R. A. Gruendl , et al. · 2025

We present the metadetection weak lensing galaxy shape catalogue from the 6-yr Dark Energy Survey (DES Y6) imaging data. This data set is the final release from DES, spanning 4422 deg$^2$ of the southern sky. We describe how the catalogue …

Dynamical dark energy in light of the DESI DR2 baryonic acoustic oscillations measurements Open

Gangxu Gu, Xiaoma Wang, Yuting Wang, Gong‐Bo Zhao, Levon Pogosian , et al. · 2025

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…

Towards isotopic composition of cosmic rays with the HELIX balloon project Open

Keith McBride, P. Allison, A. Bhardwaj, J. J. Beatty, L. Beaufore , et al. · 2025

The HELIX Drift Chamber Tracker design, analysis and calibration Open

C.E. McGrath, P. Allison, A. Bhardwaj, J. J. Beatty, L. Beaufore , et al. · 2025

DESI Strong Lens Foundry III: Keck Spectroscopy for Strong Lenses Discovered Using Residual Neural Networks Open

Shrihan Agarwal, Xiaosheng Huang, Wen‐Jenn Sheu, Christopher J. Storfer, Marcos Tamargo-Arizmendi , et al. · 2025

We present spectroscopic data of strong lenses and their source galaxies using the Keck Near-Infrared Echellette Spectrometer (NIRES) and the Dark Energy Spectroscopic Instrument (DESI), providing redshifts necessary for nearly all strong-…

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