Axel de la Macorra
A5036122402- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Black Holes and Theoretical Physics
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Particle physics theoretical and experimental studies
- CCD and CMOS Imaging Sensors
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Computational Physics and Python Applications
- Statistical and numerical algorithms
- Relativity and Gravitational Theory
- Quantum Chromodynamics and Particle Interactions
- Earth Systems and Cosmic Evolution
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Superconducting and THz Device Technology
Universidad Nacional Autónoma de México
2016-2025
Universidad de Los Andes
2025
Center for Research and Advanced Studies of the National Polytechnic Institute
2006-2024
Instituto Politécnico Nacional
2006-2024
Universitat de Barcelona
2020-2021
Instituto de Física del Sur
2004
University of Oxford
1990-1995
Abstract We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands Milky Way stars at high resolution and signal-to-noise ratios in near-infrared. Mapping Nearby Galaxies (MaNGA) survey obtaining spatially resolved spectroscopy for nearby galaxies (median <?CDATA $z\sim 0.03$?> ). extended Baryon Oscillation Spectroscopic (eBOSS)...
We present the cosmological implications from final measurements of clustering using galaxies, quasars, and Ly$\alpha$ forests completed Sloan Digital Sky Survey (SDSS) lineage experiments in large-scale structure. These experiments, composed data SDSS, SDSS-II, BOSS, eBOSS, offer independent baryon acoustic oscillation (BAO) angular-diameter distances Hubble relative to sound horizon, $r_d$, eight different samples six growth rate parameter, $f\sigma_8$, redshift-space distortions (RSD)....
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since 2014 July. This paper describes second data release from this phase, and 14th SDSS overall (making Data Release Fourteen or DR14). makes taken by SDSS-IV its first two years (2014–2016 July) public. Like all previous releases, DR14 is cumulative, including most recent reductions calibrations phase began operations 2000. New public extended Baryon Oscillation Spectroscopic Survey; Apache Point...
Abstract The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) began observations in 2014 July. It pursues three core programs: Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2), Mapping Nearby Galaxies at APO (MaNGA), and Extended Baryon Oscillation Spectroscopic (eBOSS). As well as its program, eBOSS contains two major subprograms: Time Domain (TDSS) SPectroscopic IDentification ERosita Sources (SPIDERS). This paper describes first data release from SDSS-IV,...
The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) will conduct novel cosmological observations using the BOSS spectrograph at Apache Point Observatory. Observations be simultaneous with Time Domain (TDSS) designed for variability studies and Identification of eROSITA Sources (SPIDERS) program X-ray sources. eBOSS use four different tracers to measure distance-redshift relation baryon acoustic oscillations (BAO). Using more than 250,000 new, spectroscopically confirmed luminous red...
We present measurements of the Baryon Acoustic Oscillation (BAO) scale in redshift-space using clustering quasars. consider a sample 147 000 quasars from extended Spectroscopic Survey (eBOSS) distributed over 2044 square degrees with redshifts 0.8 < z 2.2 and measure their spherically averaged both configuration Fourier space. Our observational data set 1400 simulated realizations allow us to detect preference for BAO that is greater than 2.8σ. determine distance = 1.52 3.8 per cent...
We present the final Sloan Digital Sky Survey IV (SDSS-IV) quasar catalog from Data Release 16 of extended Baryon Oscillation Spectroscopic (eBOSS). This comprises largest selection spectroscopically confirmed quasars to date. The full includes two sub-catalogs: a "superset" all SDSS-IV/eBOSS objects targeted as containing 1,440,615 observations and quasar-only 750,414 quasars, including 225,082 new appearing in an SDSS data release for first time, well known SDSS-I/II/III. automated...
This paper documents the sixteenth data release (DR16) from Sloan Digital Sky Surveys; fourth and penultimate phase (SDSS-IV). is first of southern hemisphere survey Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2); new APOGEE-2 North are also included. DR16 notable as final for main cosmological program Extended Baryon Oscillation Spectroscopic Survey (eBOSS), all raw reduced spectra that project released here. includes Time Domain (TDSS) SPectroscopic IDentification...
Abstract We present a measurement of baryonic acoustic oscillations (BAOs) from Ly α absorption and quasars at an effective redshift <?CDATA $z=2.33$?> using the complete extended Baryonic Oscillation Spectroscopic Survey (eBOSS). The 16th final eBOSS data release (SDSS DR16) contains all its predecessor, (BOSS), providing 210,005 with z q > 2.10 that are used to measure absorption. BAO scale both in autocorrelation cross-correlation 341,468 1.77. Apart statistical gain new deeper...
ABSTRACT We measure the anisotropic clustering of quasar sample from Data Release 16 (DR16) Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic (eBOSS). A 343 708 spectroscopically confirmed quasars between redshift 0.8 &lt; z 2.2 are used as tracers underlying dark matter field. In comparison with DR14 sample, final doubles number objects well survey area. this paper, we present analysis in configuration space by measuring two-point correlation function and decomposing...
We present the cosmological analysis of configuration-space anisotropic clustering in completed Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic (eBOSS) DR16 galaxy sample. This sample consists luminous red galaxies (LRGs) spanning redshift range $0.6 < z 1$, at an effective $z_{\rm eff}=0.698$. It combines 174 816 eBOSS LRGs and 202 642 BOSS CMASS galaxies. extract model baryon acoustic oscillations (BAO) redshift-space distortions (RSD) features from...
We analyse the clustering of Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Data Release 16 luminous red galaxy sample (DR16 eBOSS LRG) in combination with high redshift tail III 12 (DR12 BOSS CMASS). measure space distortions (RSD) and also extract longitudinal transverse baryonic acoustic oscillation (BAO) scale from anisotropic power spectrum signal inferred 377,458 galaxies between redshifts 0.6 1.0, effective $z_{\rm eff}=0.698$ comoving volume $2.72\,{\rm...
We measure the imprint of primordial baryon acoustic oscillations (BAOs) in correlation function Ly α absorption quasar spectra from Baryon Oscillation Spectroscopic Survey (BOSS) and extended BOSS (eBOSS) Data Release 14 (DR14) Sloan Digital Sky (SDSS)-IV. In addition to 179 965 with Lyman- (Ly ) region, we use β region 56 154 for first time. Hubble distance, D H , comoving angular diameter M relative sound horizon at drag epoch r d an effective redshift z = 2.34. Using a physical model...
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...
ABSTRACT We measure the clustering of quasars final data release (DR16) eBOSS. The sample contains $343\, 708$ between redshifts 0.8 ≤ z 2.2 over $4699\, \mathrm{deg}^2$. calculate Legendre multipoles (0,2,4) anisotropic power spectrum and perform a BAO Full-Shape (FS) analysis at effective redshift zeff = 1.480. errors include systematic that amount to 1/3 statistical error. comprise modelling part studied using blind N-body mock challenge observational effects with approximate mocks...
DESI (Dark Energy Spectropic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations and the growth of structure through redshift-space distortions with wide-area galaxy quasar redshift survey. The instrument robotically-actuated, fiber-fed spectrograph capable taking up to 5,000 simultaneous spectra over wavelength range from 360 nm 980 nm. fibers feed ten three-arm spectrographs resolution $R= λ/Δλ$ between 2000 5500, depending on...
We develop a new method, which is based on the optimal redshift weighting scheme, to extract maximal tomographic information of baryonic acoustic oscillations (BAO) and space distortions (RSD) from extended Baryon Oscillation Spectroscopic Survey (eBOSS) Data Release 14 quasar (DR14Q) survey. validate our method using Extended Zel'dovich mocks, apply pipeline eBOSS DR14Q sample in range 0.8 < |$z$| 2.2. report joint measurement fσ8 two-dimensional BAO parameters DA H at four effective...
We analyse the large-scale clustering in Fourier space of emission line galaxies (ELG) from Data Release 16 Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey. The ELG sample contains 173,736 covering 1,170 square degrees redshift range $0.6 < z 1.1$. perform a BAO measurement post-reconstruction power spectrum monopole, and study distortions (RSD) first three even multipoles. Photometric variations yield fluctuations both angular radial survey selection functions....
We present large-scale structure catalogs from the completed extended Baryon Oscillation Spectroscopic Survey (eBOSS). Derived Sloan Digital Sky (SDSS) -IV Data Release 16 (DR16), these provide data samples, corrected for observational systematics, and random positions sampling survey selection function. Combined, they allow clustering measurements suitable testing cosmological models. describe methods used to create eBOSS DR16 Luminous Red Galaxy (LRG) Quasar samples. The quasar catalog...
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...
Abstract The Dark Energy Spectroscopic Instrument (DESI) is carrying out a five-year survey that aims to measure the redshifts of tens millions galaxies and quasars, including 8 million luminous red (LRGs) in redshift range 0.4 < z ≲ 1.0. Here we present selection DESI LRG sample assess its spectroscopic performance using data from Survey Validation (SV) first two months Main Survey. sample, selected g , r W 1 photometry Legacy Imaging Surveys, highly robust against imaging systematics....
Abstract We describe the spectroscopic data processing pipeline of Dark Energy Spectroscopic Instrument (DESI), which is conducting a redshift survey about 40 million galaxies and quasars using purpose-built instrument on 4 m Mayall Telescope at Kitt Peak National Observatory. The main goal DESI to measure with unprecedented precision expansion history universe baryon acoustic oscillation technique growth rate structure space distortions. Ten spectrographs three cameras each disperse light...
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...
Abstract The Dark Energy Spectroscopic Instrument (DESI) will precisely constrain cosmic expansion and the growth of structure by collecting ∼40 million extragalactic redshifts across ∼80% history one-third sky. Emission Line galaxy (ELG) sample, which comprise about all DESI tracers, be used to probe universe over 0.6 < z 1.6 range, including 1.1 is expected provide tightest constraints. We present target selection for Survey Validation (SV) Main ELG samples, relies on imaging Legacy...