Javier Sánchez
A5056949515- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Ethics and bioethics in healthcare
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Dark Matter and Cosmic Phenomena
- Animal Disease Management and Epidemiology
- Radio Astronomy Observations and Technology
- Zoonotic diseases and public health
- Meta-analysis and systematic reviews
- Scientific Research and Discoveries
- Data-Driven Disease Surveillance
- Astrophysics and Cosmic Phenomena
- Helminth infection and control
- Astronomical Observations and Instrumentation
- Medicine and Dermatology Studies History
- Influenza Virus Research Studies
- Adaptive optics and wavefront sensing
- Ethics in medical practice
- Parasite Biology and Host Interactions
- COVID-19 epidemiological studies
- Medical Malpractice and Liability Issues
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
University of Chicago
2022-2025
Space Telescope Science Institute
2022-2025
Liebherr (France)
2025
Fermi National Accelerator Laboratory
2020-2024
Netherlands Institute for Radio Astronomy
2024
Electronics for Imaging (United States)
2024
Scania (Sweden)
2024
University of Prince Edward Island
2013-2023
University of Hull
2023
Instituto de Astrofísica de Andalucía
2016-2022
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)....
This work, together with its companion paper, Secco and Samuroff et al. (2021), presents the Dark Energy Survey Year 3 cosmic shear measurements cosmological constraints based on an analysis of over 100 million source galaxies. With data spanning 4143 deg$^2$ sky, divided into four redshift bins, we produce highest significance measurement to date, a signal-to-noise 40. We conduct blind in context $\Lambda$CDM model find 3% constraint clustering amplitude, $S_8\equiv \sigma_8 (\Omega_{\rm...
The pseudo-Cℓ is an algorithm for estimating the angular power and cross-power spectra that very fast in realistic cases also nearly optimal. can be extended to deal with contaminant deprojection E/B purification, therefore applied a wide variety of scenarios interest current future cosmological observations. This paper presents namaster, public, validated, accurate, easy-to-use software package that, first time, provides unified framework compute any pair spin-0 or spin-2 fields,...
This work and its companion paper, Amon et al. (2021), present cosmic shear measurements cosmological constraints from over 100 million source galaxies in the Dark Energy Survey (DES) Year 3 data. We constrain lensing amplitude parameter $S_8\equiv\sigma_8\sqrt{\Omega_\textrm{m}/0.3}$ at 3% level $\Lambda$CDM: $S_8=0.759^{+0.025}_{-0.023}$ (68% CL). Our constraint is 2% when using angular scale cuts that are optimized for $\Lambda$CDM analysis: $S_8=0.772^{+0.018}_{-0.017}$ With alone, we...
ABSTRACT We describe and test the fiducial covariance matrix model for combined two-point function analysis of Dark Energy Survey Year 3 (DES-Y3) data set. Using a variety new ansatzes modelling testing, we validate assumptions approximations this model. These include assumption Gaussian likelihood, trispectrum contribution to covariance, impact evaluating at wrong set parameters, masking survey geometry, deviations from Poissonian shot noise, galaxy weighting schemes, other sub-dominant...
Abstract We describe the simulated sky survey underlying second data challenge (DC2) carried out in preparation for analysis of Vera C. Rubin Observatory Legacy Survey Space and Time (LSST) by LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark LSST; DC2 program represents unique modeling effort that stresses this interconnectivity way has not been attempted before. This encompasses full end-to-end approach: starting...
The cosmological information extracted from photometric surveys is most robust when multiple probes of the large scale structure Universe are used. Two sensitive clustering galaxies and tangential shear background galaxy shapes produced by those foreground galaxies, so-called galaxy-galaxy lensing. Combining measurements these two two-point functions leads to constraints that independent way trace matter (the bias factor). optimal choice foreground, or lens, governed joint, but conflicting...
We present cosmological constraints from the analysis of angular power spectra cosmic shear maps based on data first three years observations by Dark Energy Survey (DES Y3). Our measurements are pseudo-$C_\ell$ method and offer a view complementary to that two-point correlation functions in real space, as two estimators known compress select Gaussian information different ways, due scale cuts. They may also be differently affected systematic effects theoretical uncertainties, such baryons...
Abstract We present the second public data release (DR2) from DECam Local Volume Exploration survey (DELVE). DELVE DR2 combines new observations with archival Dark Energy Survey, Legacy and other community programs. consists of ∼160,000 exposures that cover >21,000 deg 2 high-Galactic-latitude (∣ b ∣ > 10°) sky in four broadband optical/near-infrared filters ( g , r i z ). provides point-source automatic aperture photometry for ∼2.5 billion astronomical sources a median 5 σ depth =...
We carried out spectroscopic monitoring of 21 low-redshift Seyfert 1 galaxies using the Kast double spectrograph on 3-m Shane telescope at Lick Observatory from April 2016 to May 2017. Targeting active galactic nuclei (AGN) with luminosities {\lambda}L{\lambda} (5100 {\AA}) = 10^44 erg/s and predicted H{\beta} lags 20-30 days or black hole masses 10^7-10^8.5 Msun, our campaign probes luminosity-dependent trends in broad-line region (BLR) structure dynamics as well improve calibrations for...
We present and characterize the galaxy-galaxy lensing signal measured using first three years of data from Dark Energy Survey (DES Y3) covering 4132 deg$^2$. These measurements are used in DES Y3 3$\times$2pt cosmological analysis, which combines weak galaxy clustering information. use two lens samples: a magnitude-limited sample redMaGic sample, span redshift range $\sim 0.2-1$ with 10.7 M 2.6 galaxies respectively. For source catalog, we Metacalibration shape consisting $\simeq$100...
Cross-correlations of galaxy positions and shears with maps gravitational lensing the cosmic microwave background (CMB) are sensitive to distribution large-scale structure in Universe. Such cross-correlations also expected be immune some systematic effects that complicate correlation measurements internal surveys. We present modeling between measured first three years data from Dark Energy Survey CMB derived a combination 2500 deg2 SPT-SZ survey conducted South Pole Telescope full-sky Planck...
We study the clustering of galaxies detected at i < 22.5 in Science Verification observations Dark Energy Survey (DES). Two-point correlation functions are measured using 2.3 × 106 over a contiguous 116 deg2 region five bins photometric redshift width Δz = 0.2 range z 1.2. The impact errors is assessed by comparing results template-based photo-z algorithm (BPZ) to machine-learning (TPZ). A companion paper presents maps several observational variables (e.g. seeing, sky brightness) which could...
Global climate change is known to result in the emergence or re-emergence of some infectious diseases. Reliable methods identify diseases humans and animals that are most likely be influenced by therefore required. Since different priorities will affect decision address a particular pathogen threat, makers need standardised method prioritisation. Ranking Multi-Criteria Decision approaches provide such were employed here design two prioritisation tools. The opinion 64 experts was elicited...
Using the Two Micron All Sky Survey Photometric Redshift catalogue we perform a number of statistical tests aimed at detecting possible departures from homogeneity and isotropy in large-scale structure Universe. Making use angular index, an observable proposed previous publication, as well studying scaling clustering counts with magnitude limit, place constraints on fractal nature galaxy distribution. We find that properties our sample are excellent agreement standard cosmological model, it...
The reporting of observational studies in veterinary research presents many challenges that often are not adequately addressed published guidelines. To develop an extension the STROBE (Strengthening Reporting Observational Studies Epidemiology) statement addresses unique requirements for medicine related to health, production, welfare, and food safety. A consensus meeting experts was organized address with respect animal safety outcomes. Consensus May 11–13, 2014 Mississauga, Ontario,...
The STROBE (Strengthening the Reporting of Observational Studies in Epidemiology) statement was first published 2007 and again 2014. purpose original to provide guidance for authors, reviewers, editors improve comprehensiveness reporting; however, has a unique focus on observational studies. Although much provided by document is directly applicable, it deemed useful map those statements veterinary concepts, examples, highlight aspects reporting Here, we present examples explanations...
The Core Cosmology Library (CCL) provides routines to compute basic cosmological observables a high degree of accuracy, which have been verified with an extensive suite validation tests. Predictions are provided for many quantities, including distances, angular power spectra, correlation functions, halo bias and the mass function through state-of-the-art modeling prescriptions available in literature. Fiducial specifications expected galaxy distributions Large Synoptic Survey Telescope...
We analyze the clustering of galaxies in first public data release HSC Subaru Strategic Program. Despite relatively small footprints observed fields, are an excellent proxy for deep photometric datasets that will be acquired by LSST, and therefore ideal test bed analysis methods being implemented LSST DESC. select a magnitude limited sample with $i<24.5$ it four redshift bins covering $0.15\lesssim z \lesssim1.5$. carry out Fourier-space two-point this sample, including all auto-...
Using the first three years of data from Dark Energy Survey, we use ratios small-scale galaxy-galaxy lensing measurements around same lens sample to constrain source redshift uncertainties, intrinsic alignments and other nuisance parameters our model. Instead using a simple geometric approach for ratios, full modeling measurements, including corresponding integration over power spectrum contributions magnification. We perform extensive testing shear ratio (SR) by studying impact different...
We use the small scales of Dark Energy Survey (DES) Year-3 cosmic shear measurements, which are excluded from DES cosmological analysis, to constrain baryonic feedback. To model feedback, we adopt a correction and numerical package \texttt{Baccoemu} accelerate evaluation nonlinear matter power spectrum. design our analysis pipeline focus on constraints suppression effects, utilizing implication given by principal component Fisher forecasts. Our constraint effects can then be used better...
We present a validation of the Dark Energy Survey Year 3 (DES Y3) $3\ifmmode\times\else\texttimes\fi{}2$-point analysis choices by testing them on Buzzard2.0, new suite cosmological simulations that is tailored for and combined galaxy clustering weak-lensing analyses. show buzzard2.0 accurately reproduce many important aspects DES Y3 data, including photometric redshift magnitude distributions, relevant set two-point statistics. then our model data vector accurate enough to recover true...
Joint analyses of cross-correlations between measurements galaxy positions, lensing, and lensing the cosmic microwave background (CMB) offer powerful constraints on large-scale structure Universe. In a forthcoming analysis, we will present cosmological from analysis such measured using Year 3 data Dark Energy Survey (DES), CMB South Pole Telescope (SPT) Planck. Here two key ingredients this analysis: (1) an improved map in SPT-SZ survey footprint, (2) methodology that be used to extract...