Publications de Anaïs Marie Rassat

3D galaxy clustering with future wide-field surveys: Advantages of a spherical Fourier-Bessel analysis

Context. Upcoming spectroscopic galaxy surveys are extremely promising to help in addressing the major challenges of cosmology, in particular in understanding the nature of the dark universe. The strength of these surveys, naturally described in spherical ...

EDP Sciences2015

Galaxy Alignments: Theory, Modelling & Simulations

Anaïs Marie Rassat

The shapes of galaxies are not randomly oriented on the sky. During the galaxy formation and evolution process, environment has a strong influence, as tidal gravitational fields in the large-scale structure tend to align nearby galaxies. Additionally, even ...

Springer2015

Galaxy Alignments: An Overview

Anaïs Marie Rassat

The alignments between galaxies, their underlying matter structures, and the cosmic web constitute vital ingredients for a comprehensive understanding of gravity, the nature of matter, and structure formation in the Universe. We provide an overview on the ...

Springer2015

Galaxy Alignments: Observations and Impact on Cosmology

Anaïs Marie Rassat

Galaxy shapes are not randomly oriented, rather they are statistically aligned in a way that can depend on formation environment, history and galaxy type. Studying the alignment of galaxies can therefore deliver important information about the physics of g ...

Springer2015

Galaxy Alignments: Theory, Modelling & Simulations (vol 193, pg 67, 2015)

Anaïs Marie Rassat

Springer2015

Planck CMB nomalies: astrophysical and cosmological secondary effects and the curse of masking

Anaïs Marie Rassat

Large-scale anomalies have been reported in CMB data with both WMAP and Planck data. These could be due to foreground residuals and or systematic effects, though their confirmation with Planck data suggests they are not due to a problem in the WMAP or Plan ...

Iop Publishing Ltd2014

Joint Planck and WMAP CMB map reconstruction

Anaïs Marie Rassat, Jean-Luc Starck

We present a novel estimate of the cosmological microwave background (CMB) map by combining the two latest full-sky microwave surveys: WMAP nine-year and Planck PR1. The joint processing benefits from a recently introduced component separation method coine ...

EDP Sciences2014

PRISM: Recovery of the primordial spectrum from Planck data

Anaïs Marie Rassat

Aim. The primordial power spectrum describes the initial perturbations that seeded the large-scale structure we observe today. It provides an indirect probe of inflation or other structure-formation mechanisms. In this Letter, we recover the primordial pow ...

EDP Sciences2014

Removal of two large-scale cosmic microwave background anomalies after subtraction of the integrated Sachs-Wolfe effect

Anaïs Marie Rassat, Jean-Luc Starck

Context. Although there is currently a debate over the significance of the claimed large-scale anomalies in the cosmic microwave background (CMB), their existence is not totally dismissed. In parallel to the debate over their statistical significance, rece ...

Edp Sciences S A2013

Sparsity and the Bayesian perspective

Anaïs Marie Rassat, Jean-Luc Starck

Sparsity has recently been introduced in cosmology for weak-lensing and cosmic microwave background (CMB) data analysis for different applications such as denoising, component separation, or inpainting (i.e., filling the missing data or the mask). Although ...

Edp Sciences S A2013

On preferred axes in WMAP cosmic microwave background data after subtraction of the integrated Sachs-Wolfe effect

Anaïs Marie Rassat, Jean-Luc Starck

There is currently a debate over the existence of claimed statistical anomalies in the cosmic microwave background (CMB), recently confirmed in Planck data. Recent work has focussed on methods for measuring statistical significance, on masks and on seconda ...

Edp Sciences S A2013

Low-l CMB analysis and inpainting

Anaïs Marie Rassat, Jean-Luc Starck

Reconstructing the cosmic microwave background (CMB) in the Galactic plane is extremely difficult due to the dominant foreground emissions such as dust, free-free or synchrotron. For cosmological studies, the standard approach consists in masking this area ...

Edp Sciences S A2013

3D spherical analysis of baryon acoustic oscillations

Anaïs Marie Rassat

Context. Baryon acoustic oscillations (BAOs) are oscillatory features in the galaxy power spectrum which are used as a standard rod to measure the cosmological expansion. These have been studied in Cartesian space (Fourier or real space) or in spherical ha ...

2012

Spherical 3D isotropic wavelets

Anaïs Marie Rassat, Jean-Luc Starck

Context. Future cosmological surveys will provide 3D large scale structure maps with large sky coverage, for which a 3D spherical Fourier-Bessel (SFB) analysis in spherical coordinates is natural. Wavelets are particularly well-suited to the analysis and d ...

2012

3DEX: a code for fast spherical Fourier-Bessel decomposition of 3D surveys

Anaïs Marie Rassat, Jean-Luc Starck

Context. High-precision cosmology requires the analysis of large-scale surveys in 3D spherical coordinates, i.e. spherical Fourier-Bessel decomposition. Current methods are insufficient for future data-sets from wide-field cosmology surveys. ...

2012

The cosmological impact of intrinsic alignment model choice for cosmic shear

Anaïs Marie Rassat

We consider the effect of galaxy intrinsic alignments (IAs) on dark energy constraints from weak gravitational lensing. We summarize the latest version of the linear alignment model of IAs, following a brief note of Hirata & Seljak and further interpretati ...

Blackwell Publishing Ltd, Oxford2012

Gravitational Lensing Accuracy Testing 2010 (Great10) Challenge Handbook

Frédéric Courbin, Marc Gentile, Guldariya Nurbaeva, Anaïs Marie Rassat, Richard Massey, Michael Hirsch, Matthias Bethge

GRavitational lEnsing Accuracy Testing 2010 (GREAT10) is a public image analysis challenge aimed at the development of algorithms to analyze astronomical images. Specifically, the challenge is to measure varying image distortions in the presence of a varia ...

2011

Results of the GREAT08 Challenge: an image analysis competition for cosmological lensing

Frédéric Courbin, Marc Gentile, Anaïs Marie Rassat, Richard Massey, Michael Hirsch, Matthias Bethge

We present the results of the Gravitational LEnsing Accuracy Testing 2008 (GREAT08) Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. The primary goal was to stimulate new ideas by presenting the probl ...

Blackwell Publishing Ltd, Oxford2010