J. Della Costa

Deep Spectroscopy with DESI for Photometric Redshift Training and Calibration

Biprateep Dey, Jeffrey A. Newman, Tianqing Zhang, J. Aguilar et autres

Abstract Deep spectroscopic samples can improve photometric redshift (photo- z ) estimates and reduce uncertainties on redshift distributions. Such improvements can increase the cosmological constraining power of large imaging-based experiments such as the Vera C. Rubin Observatory’s Legacy Survey of Space and …

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The DESI Transients Survey: Legacy Classifications and Methodology

Xander J. Hall, A. Palmese, S. BenZvi, John Banovetz et autres

Abstract We present the first systematic spectroscopic observations of extragalactic transients from the Dark Energy Spectroscopic Instrument (DESI), as part of the DESI Transients Survey program. With 5000 fibers and an ∼8 deg 2 field of view, we exploit DESI as a …

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The Backup Program of the Dark Energy Spectroscopic Instrument’s Milky Way Survey

Arjun T. Dey, Sergey E. Koposov, Joan Najita, Andrew P. Cooper et autres

Abstract 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 additional …

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H 0 without the sound horizon (or supernovae): A 2% measurement in DESI DR1

E. A. Zaborowski, P. C. Taylor, Klaus Honscheid, Andrei Cuceu et autres

Abstract The sound horizon scale r s is a key source of information for measurements of H 0 from early-time data, and is therefore a common target of new physics proposed to solve the Hubble tension. We present a sub-2% measurement of …

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The DESI Single Fiber Lens Search. I. Four Thousand Spectroscopically Selected Galaxy–Galaxy Gravitational Lens Candidates

Juliana S. M. Karp, David J. Schlegel, Xiaosheng Huang, Nikhil Padmanabhan et autres

Abstract We present 4110 strong gravitational lens candidates, 3887 of which are new discoveries, selected from a sample of 5,837,154 luminous red galaxies (LRGs) observed with the Dark Energy Spectroscopic Instrument (DESI). Candidates are identified via the presence of background ionized oxygen …

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DESI Data Release 1: Stellar Catalogue

Sergey E. Koposov, Ting S. Li, Carlos Allende Prieto, G. E. Medina et autres

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 first time, measurements from …

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A measurement of $H_0$ from DESI DR1 using energy densities

Alex Krolewski, Andrea Crespi, Will J. Percival, Marco Bonici et autres

International audience

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Cosmology from Planck CMB lensing and DESI DR1 quasar tomography

Roger de Belsunce, Alex Krolewski, E. Chaussidon, Simone Ferraro et autres

Abstract 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 7,200 deg 2 …

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

Andrei Cuceu, H. K. Herrera-Alcantar, C. Gordon, C. Ramírez-Pérez et autres

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-Paczynski (AP) effect and the cosmic growth rate …

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

Songting Li, Wenting Wang, Sergey E. Koposov, Ting S. Li et autres

Abstract 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 sample, …

Validation of the DESI DR2 measurements of baryon acoustic oscillations from galaxies and quasars

E. Paillas, Juan Mena-Fernández, Qinxun Li, Ashley J. Ross et autres

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 oscillation (BAO) constraints across multiple tracers, including bright galaxies, …

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Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data

H. E. Noriega, Arnaud de Mattia, Alejandro Avilés, K. Lodha et autres

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 data and applying conservative cuts to overlapping multipole ranges, …

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