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Jonathan Andrew Blazek

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Related publications (45)

Advances in constraining intrinsic alignment models with hydrodynamic simulations

Jonathan Andrew Blazek

We use galaxies from the ILLUSTRISTNG, MASSIVEBLACK-II, and ILLUSTRTS-1 hydrodynamic simulations to investigate the behaviour of large scale galaxy intrinsic alignments. Our analysis spans four redshift slices over the approximate range of contemporary len ...

2021

Constraints on dark matter to dark radiation conversion in the late universe with DES-Y1 and external data

Eduardo Sanchez, Jonathan Andrew Blazek

We study a phenomenological class of models where dark matter converts to dark radiation in the low redshift epoch. This class of models, dubbed DMDR, characterizes the evolution of comoving dark-matter density with two extra parameters, and may be able to ...

American Physical Society2021

Dark Energy Survey Year 1 Results: Cosmological Constraints from Cluster Abundances, Weak Lensing, and Galaxy Correlations

Jonathan Andrew Blazek

We present the first joint analysis of cluster abundances and auto or cross-correlations of three cosmic tracer fields: galaxy density, weak gravitational lensing shear, and cluster density split by optical richness. From a joint analysis (4 x 2pt + N) of ...

2021

Perturbation theory for modeling galaxy bias: Validation with simulations of the Dark Energy Survey

Jonathan Andrew Blazek

We describe perturbation theory (PT) models of galaxy bias for applications to photometric galaxy surveys. We model the galaxy-galaxy and galaxy-matter correlation functions in configuration space and validate against measurements from mock catalogs design ...

American Physical Society2020

Controlling and leveraging small-scale information in tomographic galaxy-galaxy lensing

Jonathan Andrew Blazek

The tangential shear signal receives contributions from physical scales in the galaxy-matter correlation function well below the transverse scale at which it is measured. Since small scales are difficult to model, this non-locality has generally required s ...

OXFORD UNIV PRESS2020

Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing

Eduardo Sanchez, Yi Zhang, Jonathan Andrew Blazek

We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, Lambda CDM and wCDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Ene ...

American Physical Society2019

Dark Energy Survey Year 1 Results: Tomographic cross-correlations between Dark Energy Survey galaxies and CMB lensing from South Pole Telescope plus Planck

Eduardo Sanchez, Jonathan Andrew Blazek

We measure the cross-correlation between REDMAGIC galaxies selected from the Dark Energy Survey (DES) year 1 data and gravitational lensing of the cosmic microwave background (CMB) reconstructed from South Pole Telescope (SPT) and Planck data over 1289 deg ...

American Physical Society2019

Dark Energy Survey Year 1 results: constraints on intrinsic alignments and their colour dependence from galaxy clustering and weak lensing

Eduardo Sanchez, Jonathan Andrew Blazek

We perform a joint analysis of intrinsic alignments and cosmology using tomographic weak lensing, galaxy clustering, and galaxy-galaxy lensing measurements from Year 1 (Y1) of the Dark Energy Survey. We define early- and late-type subsamples, which are fou ...

2019

Dark Energy Survey Year 1 results: Methodology and projections for joint analysis of galaxy clustering, galaxy lensing, and CMB lensing two-point functions

Eduardo Sanchez, César Octavio Domínguez Sánchez De La Blanca, Craig Matthew Smith, Augusto Martins Lima, Jonathan Andrew Blazek

Optical imaging surveys measure both the galaxy density and the gravitational lensing-induced shear fields across the sky. Recently, the Dark Energy Survey (DES) Collaboration used a joint fit to two-point correlations between these observables to place ti ...

American Physical Society2019

Cosmological Constraints from Multiple Probes in the Dark Energy Survey

Eduardo Sanchez, Mingkui Wang, Yi Zhang, Jonathan Andrew Blazek, Yue Pan

The combination of multiple observational probes has long been advocated as a powerful technique to constrain cosmological parameters, in particular dark energy. The Dark Energy Survey has measured 207 spectroscopically confirmed type Ia supernova light cu ...

AMER PHYSICAL SOC2019

Core Cosmology Library: Precision Cosmological Predictions for LSST

David Atienza Alonso, Jonathan Andrew Blazek

The Core Cosmology Library (CCL) provides routines to compute basic cosmological observables to a high degree of accuracy, which have been verified with an extensive suite of validation tests. Predictions are provided for many cosmological quantities, incl ...

IOP PUBLISHING LTD2019

LSST: From Science Drivers to Reference Design and Anticipated Data Products

David Atienza Alonso, Guillaume Blanc, Shahram Khazaei, Christopher Montgomery, Darko Jevremovic, Abhijit Saha, Anja Annemone Becker, Michelle Miller, Jonathan Andrew Blazek, Darong Huang, Shikhar Tuli, Wei Cui

We describe here the most ambitious survey currently planned in the optical, the Large Synoptic Survey Telescope (LSST). The LSST design is driven by four main science themes: probing dark energy and dark matter, taking an inventory of the solar system, ex ...

IOP PUBLISHING LTD2019

Detecting galaxy-filament alignments in the Sloan Digital Sky Survey III

Yuguang Chen, Jonathan Andrew Blazek

Previous studies have shown the filamentary structures in the cosmic web influence the alignments of nearby galaxies. We study this effect in the LOWZ sample of the Sloan Digital Sky Survey using the 'Cosmic Web Reconstruction' filament catalogue. We find ...

OXFORD UNIV PRESS2019

The Dark Energy Survey: Data Release 1

Vanda Carla Costa Grisel, Juan Andrei Villarroel Fernandez, Eduardo Sanchez, Josiane Angèle Charlotte Smith-Clerc, Craig Matthew Smith, Aaron James Rossini, Yi Zhang, Augusto Martins Lima, Jonathan Andrew Blazek, Xi Chen, Vikram Vinayak Karve, Jennifer Kaitlyn Olsen, Xin Chen

We describe the first public data release of the Dark Energy Survey, DES DR1, consisting of reduced single-epoch images, co-added images, co-added source catalogs, and associated products and services assembled over the first 3 yr of DES science operations ...

IOP PUBLISHING LTD2018

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Jonathan Andrew Blazek

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Advances in constraining intrinsic alignment models with hydrodynamic simulations

Constraints on dark matter to dark radiation conversion in the late universe with DES-Y1 and external data

Dark Energy Survey Year 1 Results: Cosmological Constraints from Cluster Abundances, Weak Lensing, and Galaxy Correlations

Perturbation theory for modeling galaxy bias: Validation with simulations of the Dark Energy Survey

Controlling and leveraging small-scale information in tomographic galaxy-galaxy lensing

Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing

Dark Energy Survey Year 1 Results: Tomographic cross-correlations between Dark Energy Survey galaxies and CMB lensing from South Pole Telescope plus Planck

Dark Energy Survey Year 1 results: constraints on intrinsic alignments and their colour dependence from galaxy clustering and weak lensing

Dark Energy Survey Year 1 results: Methodology and projections for joint analysis of galaxy clustering, galaxy lensing, and CMB lensing two-point functions

Cosmological Constraints from Multiple Probes in the Dark Energy Survey

Core Cosmology Library: Precision Cosmological Predictions for LSST

LSST: From Science Drivers to Reference Design and Anticipated Data Products

Detecting galaxy-filament alignments in the Sloan Digital Sky Survey III

The Dark Energy Survey: Data Release 1

Time evolution of intrinsic alignments of galaxies

Dark Energy Survey Year 1 results: Cosmological constraints from cosmic shear

Dark Energy Survey year 1 results: Cosmological constraints from galaxy clustering and weak lensing

Dark Energy Survey year 1 results: Galaxy clustering for combined probes

Dark Energy Survey year 1 results: Galaxy-galaxy lensing

Density split statistics: Cosmological constraints from counts and lensing in cells in DES Y1 and SDSS data