A5028665438- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Particle physics theoretical and experimental studies
- Relativity and Gravitational Theory
- Atmospheric Ozone and Climate
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Advanced Data Storage Technologies
- Radioactive Decay and Measurement Techniques
- Superconducting and THz Device Technology
- Statistical and numerical algorithms
- Scientific Computing and Data Management
- Radiation Detection and Scintillator Technologies
- Scientific Measurement and Uncertainty Evaluation
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020-2024
Université Paris Cité
2002-2024
Université Paris-Saclay
2010-2024
Centre National de la Recherche Scientifique
2015-2024
Institut National de Physique Nucléaire et de Physique des Particules
2012-2024
Université Paris-Sud
2010-2019
GANIL
2001-2019
California Institute of Technology
2009
Laboratoire de Physique Nucléaire et de Hautes Énergies
2000
École Polytechnique
2000
<i>Context. <i/>The High Frequency Instrument (HFI) is one of the two focal instruments <i>Planck<i/> mission. It will observe whole sky in six bands 100 GHz–1 THz range.<i>Aims. HFI instrument designed to measure cosmic microwave background (CMB) with a sensitivity limited only by fundamental sources: photon noise CMB itself and residuals left after removal foregrounds. The high frequency provide full maps submillimetre sky, featuring mainly extended point source Systematic effects must be...
We propose a novel estimator of the polarization amplitude from single measurement its normally distributed $(Q,U)$ Stokes components. Based on properties Rice distribution and dubbed 'MAS' (Modified ASymptotic), it meets several desirable criteria:(i) values lie in whole positive region; (ii) is continuous; (iii) transforms smoothly with signal-to-noise ratio (SNR) Rayleigh-like shape to Gaussian one; (iv) unbiased reaches components' variance as soon SNR exceeds 2; (v) analytic can...
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...
Fink is a broker designed to enable science with large time-domain alert streams such as the one from upcoming Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). It exhibits traditional astronomy features automatised ingestion, annotation, selection redistribution promising alerts for transient science. also go beyond by providing real-time classification which continuously improved using state-of-the-art Deep Learning Adaptive techniques. These evolving added values will more...
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...
The High Frequency Instrument of <i>Planck<i/> will map the entire sky in millimeter and sub-millimeter domain from 100 to 857 GHz with unprecedented sensitivity polarization (Δ<i>P<i/>/<i>T<i/><sub>cmb<sub/> ~ 4 × 10<sup>-6<sup/> for <i>P<i/> either <i>Q<i/> or <i>U<i/> <i>T<i/><sub>cmb<sub/> 2.7 K) at 100, 143, 217 353 GHz. It lead major improvements our understanding cosmic microwave background anisotropies polarized foreground signals. make high resolution measurements <i>E<i/>-mode...
When combining cosmological and oscillations results to constrain the neutrino sector, question of propagation systematic uncertainties is often raised. We address this issue in context derivation an upper bound on sum masses ($\Sigma m_\nu$) with recent data. This work performed within ${{\mathrm{\Lambda{CDM}}}}$ model extended $\Sigma m_\nu$, for which we advocate use three mass-degenerate neutrinos. focus study linked foregrounds modelling CMB data analysis, impact present knowledge...
With the forthcoming release of high precision polarization measurements, such as from Planck satellite, it becomes critical to evaluate performance estimators for fraction and angle. These two physical quantities suffer a well-known bias in presence measurement noise, described Part I this series. In paper, II series, we explore extent which various may correct bias. Traditional frequentist are compared with recent estimators: one inspired by Bayesian analysis second following an asymptotic...
With the forthcoming release of high precision polarization measurements, such as from Planck satellite, metrology needs to improve. In particular, it is crucial take into account full knowledge noise properties when estimating fraction and angle, which suffer well-known biases. While strong simplifying assumptions have usually been made in analysis, we present a method for including covariance matrix Stokes parameters estimates distributions angle. We thereby quantify impact on biases...
We present a cross-spectra based approach for the analysis of CMB data at large angular scales to constrain reionization optical depth $\tau$, tensor scalar ratio $r$ and amplitude primordial perturbations $A_s$. With respect pixel-based developed so far, using has unique advantage eliminate spurious noise bias give better handle over residual systematics, allowing efficiently combine cosmological information encoded in cross-frequency or cross-dataset spectra. two solutions deal with...
With the forthcoming release of high precision polarization measurements, such as from Planck satellite, it becomes critical to evaluate performance estimators for fraction and angle. These two physical quantities suffer a well-known bias in presence measurement noise, has been described part I this series. In paper, II series, we explore extent which various may correct bias. Traditional frequentist are compared with recent estimators: one inspired by Bayesian analysis second following an...
The production of a primordial stochastic gravitational-wave (GW) background by processes occuring in the early Universe is expected broad range models. Observing this would open unique window onto Universe's evolutionary history. Probes like cosmic microwave (CMB) or baryon acoustic oscillations (BAO) can be used to set upper limits on GW energy density for frequencies above 10−15 Hz. We perform profile likelihood analysis Planck CMB temperature anisotropies and gravitational lensing data...
Despite the ability of cosmological concordance model ($\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$) to describe observations exceedingly well, power law expansion Universe scale radius, $R(t)\ensuremath{\propto}{t}^{n}$, has been proposed as an alternative framework. We examine here these models, analyzing their fit data using robust comparison criteria. Type Ia supernovae (SNIa), baryonic acoustic oscillations (BAO) and information from cosmic microwave background (CMB) have used. find that...
We present the first measurement of temperature and polarization angular power spectra diffuse emission Galactic dust at 353 GHz as seen by Archeops on 20% sky. The spectrum is compatible with that provided extrapolation to IRAS DIRBE maps using Finkbeiner et al. (1999, ApJ, 524, 867) model number 8. For latitudes deg we report a 4 sigma detection large scale () temperature-polarization cross-correlation set upper limits E B mode . deg, same scales, 2 These results are then extrapolated 100...
The statistical distribution of galaxies is a powerful probe to constrain cosmological models and gravity. In particular the matter power spectrum $P(k)$ brings information about distance evolution galaxy clustering together. However building from catalogues needs model convert angles on sky redshifts into distances, which leads difficulties when comparing data with predicted other models, for photometric surveys like LSST. angular $C_\ell(z_1,z_2)$ between two bins located at redshift $z_1$...
We present improved results on the measurement of angular power spectrum Cosmic Microwave Background (CMB) temperature anisotropies using data from last Archeops flight. This refined analysis is obtained by 6 most sensitive photometric pixels in CMB bands centered at 143 and 217 GHz 20% sky, mostly clear foregrounds. Using two different cross-correlation methods, we obtain very similar for spectrum. Consistency checks are performed to test robustness these paying particular attention...
<i>Aims. <i/>We prepare real-life cosmic microwave background (CMB) lensing extraction with the forthcoming <i>Planck<i/> satellite data by studying two systematic effects related to foreground contamination: impact of residuals after a component separation on lensed CMB map, and removing large contaminated region sky.<i>Methods. first use generalized morphological analysis (GMCA) method perform within simplified framework, which allows high statistics Monte-Carlo study. For second...
We demonstrate that the cosmic microwave background (CMB) temperature-polarization cross-correlation provides accurate and robust constraints on cosmological parameters. compare them with results from temperature or polarization investigate impact of foregrounds, variance, instrumental noise. This analysis makes use Planck high-multipole HiLLiPOP likelihood based angular power spectra, which takes into account systematics instrument foreground residuals directly modelled using measurements....
<i>Context. <i/>The <i>Planck<i/> satellite was successfully launched on May 14th 2009. We have completed the pre-launch calibration measurements of High Frequency Instrument (HFI) board and their processing.<i>Aims. <i/>We present results ot HFI in which we multiple objectives. First, determine instrumental parameters that cannot be measured in-flight predict can. Second, take opportunity to operate understand instrument under a wide range anticipated operating conditions. Finally, estimate...
We present an iterative scheme designed to recover calibrated I, Q, and U maps from Planck-HFI data using the orbital dipole due satellite motion with respect Solar System frame. It combines a map reconstruction, based on destriping technique, juxtaposed absolute calibration algorithm. evaluate systematic statistical uncertainties incurred during both these steps help of realistic, Planck-like simulations containing CMB, foreground components instrumental noise, assess accuracy sky...
The angular power spectra of the cosmic microwave background (CMB) temperature anisotropies reconstructed from Planck data seem to present “too much” gravitational lensing distortion. This is quantified by control parameter AL that should be compatible with unity for a standard cosmology. With class Boltzmann solver and profile-likelihood method, this we measure 2.6σ shift 1 using public likelihoods. We show that, owing strong correlations reionization optical depth τ primordial perturbation...