R. Miquel

Extensive analysis of reconstruction algorithms for DESI 2024 baryon acoustic oscillations

Xinyi Chen, Z. Ding, E. Paillas, S. Nadathur et autres

Abstract Reconstruction of the baryon acoustic oscillation (BAO) signal has been a standard procedure in BAO analyses over the past decade and has helped to improve the BAO parameter precision by a factor of ∼2 on average. The Dark Energy Spectroscopic Instrument …

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DESI-DR1 3 × 2 -pt analysis: consistent cosmology across weak lensing surveys

A. Porredon, Cullen H. Blake, J.U Lange, N Emas et autres

We present a joint cosmological analysis of projected galaxy clustering observations from the Dark Energy Spectroscopic Instrument Data Release 1 (DESI-DR1), and overlapping weak gravitational lensing observations from three datasets: the Kilo-Degree Survey (KiDS-1000), the Dark Energy Survey (DES-Y3), and the Hyper-Suprime-Cam …

DESI Data Release 1: Stellar Catalogue

S. 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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Clustering redshift distribution calibration of weak lensing surveys using the DESI-DR1 spectroscopic dataset

Rossana Ruggeri, Cullen H. Blake, José Edgar Madriz Aguilar, S. Ahlen et autres

We estimate the source redshift distribution of current weak lensing surveys by applying the clustering-based redshift calibration technique, using the galaxy redshift sample provided by the Dark Energy Spectroscopic Instrument Data Release 1 (DESI-DR1). We cross-correlate the Bright Galaxy Survey (BGS), Luminous …

Dark Energy Survey Year 3 Results: Cosmological constraints from second- and third-order shear statistics

Rafael C. H. Gomes, S. Sugiyama, B. Jain, Mike Jarvis et autres

The authors demonstrate that combining the third-order aperture mass statistic with the two point correlation function on Dark Energy Survey Year 3 cosmic shear data leads to a 111% (22%) improved figure-of-merit on the joint \ensuremath{\Omega}ₘ-S₈ (S₈-w₀) constraint. They further show that …

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

Naim Göksel Karaçaylı, Paul Martini, J. Aguilar, S. P. Ahlen et autres

Abstract 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 intergalactic medium. We present the measurement …

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Dark energy survey year 3 results: Cosmological constraints from cluster abundances, weak lensing, and galaxy clustering

M. Aguena, A. Alarcon, A. Amon, Dhayaa Anbajagane et autres

DES Collaboration: Abbott, T.M.C. et al.

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Window convolution of the galaxy clustering bispectrum

M. S. Wang, Florian Beutler, J. Aguilar, S. P. Ahlen et autres

Abstract In galaxy survey analysis, the observed clustering statistics do not directly match theoretical predictions but rather have been processed by a window function that arises from the survey geometry including the sky footprint, redshift-dependent background number density and systematic weights. While …

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Characterization of DESI fiber assignment incompleteness effect on 2-point clustering and mitigation methods for DR1 analysis

Davide Bianchi, M. Hanif, A. Carnero Rosell, J. Lasker et autres

Abstract We present an in-depth analysis of the fiber assignment incompleteness in the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1). This incompleteness is caused by the restricted mobility of the robotic fiber positioner in the DESI focal plane, which limits …

it, ch, jp, us, es, nl, fr, gb, mx, au, ca, uz, kr, cn (code pays fourni par la source)

Dark Energy Survey Year 3 results: Simulation-based cosmological inference with wavelet harmonics, scattering transforms, and moments of weak lensing mass maps. II. cosmological results

M. Gatti, G. Campailla, N Jeffrey, L Whiteway et autres

The paper applies a novel simulation-based cosmological inference methodology to Dark Energy Survey Year-3-based weak-lensing mass maps. Inclusion of nongaussian statistics strongly improves cosmological constraints, establishing consistency with other work with the same and different datasets.

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Galaxy cluster matter profiles

Amitesh Singh, J. J. Mohr, C. T. Davies, S. Bocquet et autres

We present a study of the weak lensing inferred matter profiles ΔΣ(R) of 698 South Pole Telescope (SPT) thermal Sunyaev-Zel’dovich effect (tSZE) selected and MCMF optically confirmed galaxy clusters in the redshift range 0.25 < z < 0.94 that have associated weak …

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GD-1 Stellar Stream and Cocoon in the DESI Early Data Release

Monica Valluri, Parker Fagrelius, S. E. Koposov, Ting S. Li et autres

Abstract We present ∼115 new spectroscopically identified members of the GD-1 tidal stream observed with the 5000-fiber Dark Energy Spectroscopic Instrument (DESI). We confirm the existence of a “cocoon,” which is a broad (FWHM ∼ 2 . ° 932 ∼ 460 pc) …

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