C. García-Quintero
A5006420122- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Black Holes and Theoretical Physics
- Particle physics theoretical and experimental studies
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
- Noncommutative and Quantum Gravity Theories
- Statistical and numerical algorithms
- Astrophysics and Cosmic Phenomena
- Relativity and Gravitational Theory
- Computational Physics and Python Applications
- Atmospheric Ozone and Climate
- Advanced Differential Geometry Research
- 3D Shape Modeling and Analysis
- demographic modeling and climate adaptation
- Spectroscopy and Chemometric Analyses
- Medical Image Segmentation Techniques
- Radioactive Decay and Measurement Techniques
The University of Texas at Dallas
2019-2024
Center for Astrophysics Harvard & Smithsonian
2024
Autonomous University of Sinaloa
2019
The Dark Energy Spectroscopic Instrument (DESI) has embarked on an ambitious five-year survey to explore the nature of dark energy with spectroscopy 40 million galaxies and quasars. DESI will determine precise redshifts employ Baryon Acoustic Oscillation method measure distances from nearby universe z > 3.5, as well growth structure probe potential modifications general relativity. In this paper we describe significant instrumentation developed for survey. new includes a wide-field, 3.2-deg...
We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman-$\alpha$ forest tracers first year observations Dark Energy Spectroscopic Instrument (DESI), to be released DESI Data Release 1. BAO provide robust measurements transverse comoving distance Hubble rate, or their combination, relative sound horizon, seven redshift bins over 6 million extragalactic objects range $0.1<z<4.2$. data alone are consistent with standard flat...
The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg$^2$ over five years constrain the cosmic expansion history through precise measurements of Baryon Acoustic Oscillations (BAO). scientific program for DESI evaluated during month Survey Validation (SV) campaign before beginning full operations. This produced deep spectra tens thousands objects from each stellar (MWS), bright galaxy (BGS), luminous red (LRG), emission line (ELG), and quasar...
Abstract The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from constitute the first major data sample DESI survey. This paper describes public release those spectra, catalogs derived properties, intermediate products. In total, includes good-quality spectral information 466,447 objects targeted as part Milky Way Survey, 428,758 Bright Galaxy 227,318 Luminous Red sample, 437,664 Emission Line...
The Dark Energy Spectroscopic Instrument (DESI) completed its five-month Survey Validation in May 2021. Spectra of stellar and extragalactic targets from constitute the first major data sample DESI survey. This paper describes public release those spectra, catalogs derived properties, intermediate products. In total, includes good-quality spectral information 466,447 objects targeted as part Milky Way Survey, 428,758 Bright Galaxy 227,318 Luminous Red sample, 437,664 Emission Line 76,079...
We present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique redshifts in range 0.1<z<2.1. Divided by tracer type, we utilize 300,017 galaxies from magnitude-limited Bright Galaxy Survey with 0.1<z<0.4, 2,138,600 Luminous Red Galaxies 0.4<z<1.1, 2,432,022 Emission Line 0.8<z<1.6, 856,652 quasars 0.8<z<2.1, a ~7,500 square degree footprint. The analysis was blinded at catalog-level to avoid confirmation bias. All fiducial choices of...
Abstract We present the measurement of Baryon Acoustic Oscillations (BAO) from Lyman- α (Ly ) forest high-redshift quasars with first-year dataset Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Ly spectra and their correlation spatial distribution more than 700 quasars. An essential facet this work is development a new methodology on blinded dataset. conducted rigorous tests using synthetic data to ensure reliability our findings before unblinding. Additionally,...
ABSTRACT This paper provides a comprehensive overview of how fitting baryon acoustic oscillations (BAO) is carried out within the upcoming Dark Energy Spectroscopic Instrument’s (DESI) 2024 results using its DR1 data set, and associated systematic error budget from theory modelling BAO. We derive new showing non-linearities in clustering galaxies can cause potential biases measurements isotropic ($\alpha _{\mathrm{iso}}$) anisotropic _{\mathrm{ap}}$) BAO distance scales, these be effectively...
Abstract We present an optimized way of producing the fast semi-analytical covariance matrices for Legendre moments two-point correlation function, taking into account survey geometry and mimicking non-Gaussian effects. validate approach on simulated (mock) catalogs different galaxy types, representative Dark Energy Spectroscopic Instrument (DESI) Data Release 1, used in 2024 analyses. find only a few percent differences between mock sample matrix our results, which can be expected given...
Abstract Baryon acoustic oscillations (BAO) provide a robust standard ruler to measure the expansion history of Universe through galaxy clustering. Density-field reconstruction is now widely adopted procedure for increasing precision and accuracy BAO detection. With goal finding optimal settings be used in DESI 2024 analysis, we assess sensitivity post-reconstruction constraints different choices our analysis configuration, performing tests on blinded data from first year observations (DR1),...
Abstract The Dark Energy Spectroscopic Instrument (DESI) will provide precise measurements of Baryon Acoustic Oscillations (BAO) to constrain the expansion history Universe and set stringent constraints on dark energy. Therefore, control global error budget due various systematic effects is required for DESI 2024 BAO analysis. In this work, we estimate level systematics induced in analysis assumed Halo Occupation Distribution (HOD) model Emission Line Galaxy (ELG) tracer. We make use mock...
Abstract In this paper, we present the estimation of systematics related to halo occupation distribution (HOD) modeling in baryon acoustic oscillations (BAO) distance measurement Dark Energy Spectroscopic Instrument (DESI) 2024 analysis. This paper focuses on study HOD for luminous red galaxies (LRG). We consider three different models LRGs, including base 5-parameter vanilla model and two extensions it, that refer as baseline extended models. The is described by 5 parameters, an...
Abstract When measuring the Baryon Acoustic Oscillations (BAO) scale from galaxy surveys, one typically assumes a fiducial cosmology when converting redshift measurements into comoving distances and also defining input parameters for reconstruction algorithm. A parameterised template model to be fitted is created based on (possibly different) cosmology. This reliance can considered form of data compression, then analysed allowing that true answer different assumed. In this study, we evaluate...
The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg$^2$ over five years constrain the cosmic expansion history through precise measurements of Baryon Acoustic Oscillations (BAO). scientific program for DESI evaluated during month Survey Validation (SV) campaign before beginning full operations. This produced deep spectra tens thousands objects from each stellar (MWS), bright galaxy (BGS), luminous red (LRG), emission line (ELG), and quasar...
ABSTRACT We present the first detection of baryon acoustic oscillations (BAOs) signal obtained using unblinded data collected during initial 2 months operations Stage-IV ground-based Dark Energy Spectroscopic Instrument (DESI). From a selected sample 261 291 luminous red galaxies spanning redshift interval 0.4 &lt; z 1.1 and covering 1651 square degrees with 57.9 per cent completeness level, we report ∼5σ level BAO measurement location at precision 1.7 cent. Using bright galaxy 109 523...
In order to address fundamental questions related the expansion history of Universe and its primordial nature with next generation galaxy experiments, we need model reliably large-scale structure observables such as correlation function power spectrum. Cosmological $N$-body simulations provide a reference through which can test our models, but their output suffers from sample variance on large scales. Fortunately, this is regime where accurate analytic approximations exist. To reduce...
Baryon acoustic oscillations (BAO) provide a robust standard ruler to measure the expansion history of Universe through galaxy clustering. Density-field reconstruction is now widely adopted procedure for increasing precision and accuracy BAO detection. With goal finding optimal settings be used in DESI 2024 analysis, we assess sensitivity post-reconstruction constraints different choices our analysis configuration, performing tests on blinded data from first year observations (DR1), as well...
We present the measurements and cosmological implications of galaxy two-point clustering using over 4.7 million unique quasar redshifts in range $0.1<z<2.1$ divided into six redshift bins a $\sim 7,500$ square degree footprint, from first year observations with Dark Energy Spectroscopic Instrument (DESI Data Release 1). By fitting full power spectrum, we extend previous DESI DR1 baryon acoustic oscillation (BAO) to include redshift-space distortions signals matter-radiation equality scale....
Abstract Ongoing and upcoming galaxy redshift surveys, such as the Dark Energy Spectroscopic Instrument (DESI) survey, will observe vast regions of sky a wide range redshifts. In order to model observations address various systematic uncertainties, N -body simulations are routinely adopted, however, number large with sufficiently high mass resolution is usually limited by available computing time. Therefore, achieving simulation volume effective statistical errors significantly smaller than...
The current generation of large galaxy surveys will test the cosmological model by combining multiple types observational probes. Realising statistical promise these new datasets requires rigorous attention to all aspects analysis including measurements, modelling, covariance and parameter likelihood. In this paper we present results an end-to-end simulation study designed pipeline for combination Dark Energy Spectroscopic Instrument (DESI) Year 1 redshift dataset separate weak gravitational...
We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), based on three years of operation. For cosmology inference, these galaxy are combined with DESI Lyman-$\alpha$ forest BAO results presented in a companion paper. The DR2 consistent DR1 SDSS, their distance-redshift relationship matches those recent compilations supernovae (SNe) over same redshift range. well...
We present the Baryon Acoustic Oscillation (BAO) measurements with Lyman-alpha (LyA) forest from second data release (DR2) of Dark Energy Spectroscopic Instrument (DESI) survey. Our BAO include both auto-correlation LyA absorption observed in spectra high-redshift quasars and cross-correlation quasar positions. The total sample size is approximately a factor two larger than DR1 dataset, over 820,000 positions 1.2 million quasars. describe several significant improvements to our analysis this...
The Dark Energy Spectroscopic Instrument (DESI) data release 2 (DR2) galaxy and quasar clustering represents a significant expansion of from DR1, providing improved statistical precision in BAO constraints across multiple tracers, including bright galaxies (BGS), luminous red (LRGs), emission line (ELGs), quasars (QSOs). In this paper, we validate the analysis DR2. We present results robustness tests on blinded DR2 and, after unblinding, consistency checks unblinded data. All are compared to...