M. Remazeilles
A5065379276- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Relativity and Gravitational Theory
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Radioactive Decay and Measurement Techniques
- Statistical and numerical algorithms
- Black Holes and Theoretical Physics
- Astronomical Observations and Instrumentation
- Blind Source Separation Techniques
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
Instituto de Física de Cantabria
2022-2025
University of Manchester
2015-2024
Université Paris Cité
2011-2024
Centre National de la Recherche Scientifique
2012-2024
Institut d'Astrophysique Spatiale
2012-2024
Université Paris-Saclay
2009-2024
University of California, San Diego
2024
École Normale Supérieure
2018-2024
Columbia University
2022-2024
Sorbonne Université
2024
The all-sky 408 MHz map of Haslam et al. is one the most important total-power radio surveys. It has been widely used to study diffuse synchrotron radiation from our Galaxy and as a template remove foregrounds in cosmic microwave background data. However, there are number issues associated with it that must be dealt with, including large-scale striations contamination extragalactic sources. We have re-evaluated reprocessed rawest data available produce new improved 408-MHz map. first...
Voyage 2050 White Paper highlighting the unique science opportunities using spectral distortions of cosmic microwave background (CMB). CMB probe many processes throughout history Universe. Precision spectroscopy, possible with existing technology, would provide key tests for expected within cosmological standard model and open an enormous discovery space to new physics. This offers scientific furthering our understanding inflation, recombination, reionization structure formation as well dark...
The 'Internal Linear Combination' (ILC) component separation method has been extensively used to extract a single component, the CMB, from WMAP multifrequency data. We generalise ILC approach for separating other millimetre astrophysical emissions. construct in particular multidimensional filter, which can be used, instance, estimate diffuse emission of complex originating multiple correlated emissions, such as total Galactic interstellar medium. performance generalised methods, implemented...
The Probe of Inflation and Cosmic Origins (PICO) is a proposed probe-scale space mission consisting an imaging polarimeter operating in frequency bands between 20 800 GHz. We describe the science achievable by PICO, which has sensitivity equivalent to more than 3300 Planck missions, technical implementation, schedule cost.
The measurement of the large-scale B-mode polarization in cosmic microwave background (CMB) is a fundamental goal future CMB experiments. However, because unprecedented sensitivity, experiments will be much more sensitive to any imperfect modelling Galactic foreground reconstruction primordial signal. We compare sensitivity B-modes different concepts satellite missions (LiteBIRD, COrE, COrE+, PRISM, EPIC, PIXIE) presence foregrounds. In particular, we quantify impact on tensor-to-scalar...
Galactic foregrounds are the main obstacle to observations of cosmic microwave background (CMB) $B$-mode polarization. In addition obscuring inflationary signal by several orders magnitude, have non-trivial spectral signatures that partially unknown and distorted averaging effects along line-of-sight, within pixel/beam window, various analysis choices (e.g., spherical harmonic transforms filters). Statistical moment expansion methods provide a powerful tool for modeling effective foreground...
Abstract PICO is a concept for NASA probe-scale mission aiming to detect or constrain the tensor scalar ratio r , parameter that quantifies amplitude of inflationary gravity waves. We carry out map-based component separation on simulations with five foreground models and input values in = 0 0.003. forecast determinations using Gaussian likelihood assuming either no delensing residual lensing factor A lens 27%. By implementing first full-sky, post component-separation, map-domain delensing,...
Abstract We study the possibility of using LiteBIRD satellite B -mode survey to constrain models inflation producing specific features in CMB angular power spectra. explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This can source parity-violating gravitational waves from amplification fluctuations driven by pseudoscalar “axionlike” field, rolling for few e-folds during The sourced exceed vacuum contribution at reionization bump scales about an order...
The 'Internal Linear Combination' (ILC) component separation method has been extensively used on the data of Wilkinson Microwave Anisotropy Probe (WMAP) space mission, to extract a single component, cosmic microwave background (CMB), from WMAP multifrequency data. We extend ILC approach for reconstructing millimetre astrophysical emissions beyond CMB alone. In particular, we construct constrained maps both and thermal Sunyaev–Zeldovich (SZ) effect, with vanishing contamination other....
We demonstrate that, for the baseline design of CORE satellite mission, polarized foregrounds can be controlled at level required to allow detection primordial cosmic microwave background (CMB) B-mode polarization with desired accuracy both reionization and recombination scales, tensor-to-scalar ratio values r≳ 5× 10−3. consider detailed sky simulations based on state-of-the-art CMB observations that consist τ=0.055 ranging from r=10−2 10−3, Galactic synchrotron, thermal dust variable...
Lensing of the CMB is now a well-developed probe large-scale clustering over broad range redshifts. By exploiting non-Gaussian imprints lensing in polarization CMB, CORE mission can produce clean map deflections nearly full-sky. The number high-S/N modes this will exceed current maps by factor 40, and measurement be sample-variance limited on all scales where linear theory valid. Here, we summarise product discuss science that it enable. For example, summed mass neutrinos determined to an...
Our current understanding of the Universe is established through pristine measurements structure in cosmic microwave background (CMB) and distribution shapes galaxies tracing large scale (LSS) Universe. One key ingredient that underlies cosmological observables field sources observed assumed to be initially Gaussian with high precision. Nevertheless, a minimal deviation from Gaussianityis perhaps most robust theoretical prediction models explain Universe; itis necessarily present even...
Abstract We present a study of the impact beam far side-lobe lack knowledge on measurement Cosmic Microwave Background B -mode signal at large scale. Beam side-lobes induce mismatch in transfer function Galactic foregrounds between dipole and higher multipoles which degrads performances component separation methods. This leads to foreground residuals CMB map. It is expected be one main source systematic effects future polarization observations. Thus, it becomes crucial for all-sky survey...
H i intensity mapping is an emerging tool to probe dark energy. Observations of the redshifted signal will be contaminated by instrumental noise, atmospheric and Galactic foregrounds. The latter expected four orders magnitude brighter than emission we wish detect. We present a simulation single-dish observations including noise model with 1/f white sky diffuse foreground emission. consider two cleaning methods: spectral parametric fitting principal component analysis. For smooth frequency...
H i intensity mapping is a new observational technique to map fluctuations in the large-scale structure of matter using 21 cm emission line atomic hydrogen (H i). Sensitive experiments have potential detect Baryon Acoustic Oscillations at low redshifts (z ≲ 1) order constrain properties dark energy. Observations signal will be contaminated by instrumental noise and, more significantly, astrophysical foregrounds, such as Galactic synchrotron emission, which least four orders magnitude...
The Probe of Inflation and Cosmic Origins (PICO) is an imaging polarimeter that will scan the sky for 5 years in 21 frequency bands spread between 799 GHz. It produce full-sky surveys intensity polarization with a final combined-map noise level 0.87 $\mu$K arcmin required specifications, equivalent to 3300 Planck missions, our current best-estimate would have 0.61 (6400 missions). PICO either determine energy scale inflation by detecting tensor scalar ratio at $r=5\times 10^{-4}~(5\sigma)$,...
Context. Observations of the redshifted 21-cm line neutral hydrogen (H I ) are a new and powerful window observation that offers us possibility to map spatial distribution cosmic H learn about cosmology. Baryon Acoustic Oscillations from Integrated Neutral Gas (BINGO) is unique radio telescope designed be one first probe baryon acoustic oscillations (BAO) at frequencies. Aims. BINGO has two science goals: cosmology astrophysics. Cosmology main goal driver for BINGO’s design strategy. The key...
Abstract This paper discusses the science case for a sensitive spectro-polarimetric survey of microwave sky. Such would provide tomographic and dynamic census three-dimensional distribution hot gas, velocity flows, early metals, dust, mass in entire Hubble volume, exploit CMB temperature polarisation anisotropies down to fundamental limits, track energy injection absorption into radiation background across cosmic times by measuring spectral distortions blackbody emission. In addition its...
We introduce and validate a delensing framework for the Simons Observatory (SO), which will be used to improve constraints on inflationary gravitational waves by reducing lensing noise in measurements of $B$ modes CMB polarization. SO initially observe using three small aperture telescopes one large-aperture telescope. While polarization maps from small-aperture constrain waves, internal delens reconstructed data Since obtained dominated subdegree scales, constructs template lensing-induced...
Abstract Upcoming Cosmic Microwave Background (CMB) experiments, aimed at measuring primordial CMB polarization B-modes, require exquisite control of instrumental systematics and Galactic foreground contamination. Blind minimum-variance techniques, like the Needlet Internal Linear Combination (NILC), have proven effective in reconstructing signal mitigating foregrounds across diverse sky models without suffering from mismodelling errors. Still, residual contamination NILC may bias recovered...
Abstract The detection of primordial B modes the cosmic microwave background (CMB) could provide information about early stages Universe's evolution. faintness this signal requires exquisite calibration accuracy and control instrumental systematic effects which otherwise bias measurements. In work, we study impact an imperfect relative polarisation gain on recovered value tensor-to-scalar ratio r for LiteBIRD experiment, through application blind Needlet Internal Linear Combination (NILC)...
Abstract Stacking the public Planck CMB temperature maps (NILC, SMICA, SEVEM, Commander) on galaxy clusters from catalogues reveals substantial residual contamination thermal Sunyaev-Zeldovich (tSZ) emission. Unexpectedly, stacking ”tSZ-free” maps, like SMICA-noSZ or Constrained ILC (CILC) still shows noticeable clusters. We demonstrate that this persisting stems neglected relativistic SZ (rSZ) corrections in map estimation. Employing a component-separation method specifically designed for...