A. J. Banday
A5010910020- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Advanced Differential Geometry Research
- Particle physics theoretical and experimental studies
- Superconducting and THz Device Technology
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Statistical and numerical algorithms
- Blind Source Separation Techniques
- Climate variability and models
- Black Holes and Theoretical Physics
- Complex Systems and Time Series Analysis
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Spectroscopy and Chemometric Analyses
- Fractal and DNA sequence analysis
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Optical Sensing Technologies
Université Toulouse III - Paul Sabatier
2014-2024
Centre National de la Recherche Scientifique
2014-2024
Université de Toulouse
2014-2024
Institut de Recherche en Astrophysique et Planétologie
2012-2024
Roche (France)
2011-2021
Japan Aerospace Exploration Agency
2020
McGill University
2020
Centre National d'Études Spatiales
2020
Roche (Switzerland)
2012-2013
Laboratoire d'Analyse et d'Architecture des Systèmes
2009-2011
HEALPix -- the Hierarchical Equal Area iso-Latitude Pixelization is a versatile data structure with an associated library of computational algorithms and visualization software that supports fast scientific applications executable directly on very large volumes astronomical area surveys in form discretized spherical maps. Originally developed to address processing analysis needs present generation cosmic microwave background (CMB) experiments (e.g. BOOMERanG, WMAP), can be expanded meet many...
The European Space Agency's Planck satellite, which was dedicated to studying the early Universe and its subsequent evolution, launched on 14 May 2009. It scanned microwave submillimetre sky continuously between 12 August 2009 23 October 2013, producing deep, high-resolution, all-sky maps in nine frequency bands from 30 857GHz. This paper presents cosmological legacy of Planck, currently provides our strongest constraints parameters standard model some tightest limits available deviations...
We present the all-sky Planck catalogue of Sunyaev-Zeldovich (SZ) sources detected from 29 month full-mission data. The (PSZ2) is largest SZ-selected sample galaxy clusters yet produced and deepest clusters. It contains 1653 detections, which 1203 are confirmed with identified counterparts in external data-sets, first cluster survey containing > $10^3$ a detailed analysis selection function terms its completeness statistical reliability, placing lower limit 83% on purity. Using simulations,...
The European Space Agency's Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14~May 2009 scanned microwave submillimetre sky continuously between 12~August 23~October 2013. In February~2015, ESA Collaboration released second set of cosmology products based on data from entire mission, including both temperature polarization, along with a scientific technical papers web-based explanatory supplement. This paper gives an overview main...
We describe the legacy Planck cosmic microwave background (CMB) likelihoods derived from 2018 data release. The overall approach is similar in spirit to one retained for 2013 and 2015 release, with a hybrid method using different approximations at low ( ℓ < 30) high ≥ multipoles, implementing several methodological data-analysis refinements compared previous releases. With more realistic simulations, better correction modelling of systematic effects, we can now make full use CMB...
We report on the results from two independent but complementary statistical analyses of Wilkinson Microwave Anisotropy Probe (WMAP) first-year data, based power spectrum and N-point correlation functions. focus large intermediate scales (larger than about 3°) compare observed data against Monte Carlo ensembles with WMAP-like properties. In both analyses, we measure amplitudes large-scale fluctuations opposing hemispheres study ratio amplitudes. The power-spectrum analysis shows that this for...
This paper presents the Planck 2015 likelihoods, statistical descriptions of 2-point correlations CMB data, using hybrid approach employed previously: pixel-based at $\ell<30$ and a Gaussian approximation to distribution spectra higher $\ell$. The main improvements are use more better processed data polarization detailed foreground instrumental models, allowing further checks enhanced immunity systematics. Progress in modelling enables larger sky fraction. Improvements processing models...
We present cluster counts and corresponding cosmological constraints from the Planck full mission data set. Our catalogue consists of 439 clusters detected via their Sunyaev-Zeldovich (SZ) signal down to a signal-to-noise ratio 6, is more than factor 2 larger 2013 cosmology sample. The are consistent with those yield compatible under same modelling assumptions. Taking advantage catalogue, we extend our analysis two-dimensional distribution in redshift signal-to-noise. use mass estimates two...
We analyse the Planck full-mission cosmic microwave background (CMB) temperature and E -mode polarization maps to obtain constraints on primordial non-Gaussianity (NG). compare estimates obtained from separable template-fitting, binned, optimal modal bispectrum estimators, finding consistent values for local, equilateral, orthogonal amplitudes. Our combined analysis produces following final results: f NL local = −0.9 ± 5.1; equil −26 47; ortho −38 24 (68% CL, statistical). These results...
Analysis of the Planck 2018 data set indicates that statistical properties cosmic microwave background (CMB) temperature anisotropies are in excellent agreement with previous studies using 2013 and 2015 releases. In particular, they consistent Gaussian predictions $Λ$CDM cosmological model, yet also confirm presence several so-called "anomalies" on large angular scales. The novelty current study, however, lies being a first attempt at comprehensive analysis statistics polarization signal...
The Planck full mission cosmic microwave background(CMB) temperature and E-mode polarization maps are analysed to obtain constraints on primordial non-Gaussianity(NG). Using three classes of optimal bispectrum estimators - separable template-fitting (KSW), binned, modal we consistent values for the local, equilateral, orthogonal amplitudes, quoting as our final result from alone fNL^local=2.5+\-5.7, fNL^equil=-16+\-70 fNL^ortho=-34+\-33(68%CL). Combining data fNL^local=0.8+\-5.0,...
Planck has mapped the microwave sky in nine frequency bands between 30 and 857 GHz temperature seven 353 polarization. In this paper we consider problem of diffuse astrophysical component separation, process these maps within a Bayesian framework to derive consistent set full-sky maps. For analysis, combine observations with 9-year WMAP Haslam et al. 408 MHz map joint model CMB, synchrotron, free-free, spinning dust, CO, line emission 94 100 channels, thermal dust emission. Full-sky are...
We present the most significant measurement of cosmic microwave background (CMB) lensing potential to date (at a level 40 sigma), using temperature and polarization data from Planck 2015 full-mission release. Using polarization-only estimator we detect at significance 5 sigma. cross-check accuracy our wide frequency coverage complementarity measurements. Public products based on this include an estimate over approximately 70% sky, power spectrum in bandpowers for multipole range
We present full-sky maps of the cosmic microwave background (CMB) and polarized synchrotron thermal dust emission, derived from third set Planck frequency maps. These products have significantly lower contamination instrumental systematic effects than previous versions. The methodologies used to derive these follow those described in earlier papers, adopting four methods (Commander, NILC, SEVEM, SMICA) extract CMB component, as well three GNILC, astrophysical components. Our revised...
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...
This paper presents the High Frequency Instrument (HFI) data processing procedures for Planck 2018 release. Major improvements in mapmaking have been achieved since previous 2015 They enabled first significant measurement of reionization optical depth parameter using HFI data. an extensive analysis systematic effects, including use simulations to facilitate their removal and characterize residuals. The polarized data, which presented a number known problems release, are very significantly...
We present foreground-reduced CMB maps derived from the full Planck data set in both temperature and polarization. Compared to corresponding 2013 sky maps, total volume is larger by a factor of 3.2 for frequencies between 30 70 GHz, 1.9 100 857 GHz. In addition, systematic errors forms temperature-to-polarization leakage, analogue-to-digital conversion uncertainties, very long time constant have been dramatically reduced, extent that cosmological polarization signal may now be robustly...
This paper describes the processing applied to cleaned, time-ordered information obtained from Planck High Frequency Instrument (HFI) with aim of producing photometrically calibrated maps in temperature and (for first time) polarization. The data entire 2.5-year HFI mission include almost five full-sky surveys. observes sky over a broad range frequencies, 100 857 GHz. To obtain best accuracy on calibration such large range, two different photometric schemes have been used. 545 GHz are using...
We present the NPIPE processing pipeline, which produces calibrated frequency maps in temperature and polarization from data Planck Low Frequency Instrument (LFI) High (HFI) using high-performance computers. represents a natural evolution of previous analysis efforts, combines some most powerful features separate LFI HFI pipelines. For example, following 2018 procedure, uses foreground priors during calibration stage order to break scanning-induced degeneracies. Similarly, employs...
Abstract LiteBIRD, the Lite (Light) satellite for study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission primordial cosmology fundamental physics. The Japan Aerospace Exploration Agency (JAXA) selected LiteBIRD in May 2019 as strategic large-class (L-class) mission, with an expected launch late 2020s using JAXA’s H3 rocket. planned to orbit Sun–Earth Lagrangian point L2, where it will map microwave over entire sky three years, telescopes 15...
The study of polarized dust emission has become entwined with the analysis cosmic microwave background (CMB) polarization. We use new Planck maps to characterize Galactic as a foreground CMB present EE, BB, and TE power spectra polarization at 353 GHz for six nested sky regions covering from 24 71 % sky. power-law fits angular spectra, yielding evidence statistically significant variations exponents over difference between values EE BB spectra. correlation E/B asymmetry extend low multipoles...
We present constraints on the tensor-to-scalar ratio r using Planck data. use latest release of maps (PR4), processed with NPIPE code, which produces calibrated frequency in temperature and polarization for all channels from 30 GHz to 857 same pipeline. computed BB angular power spectrum, we also discuss coming TT spectrum. Given Planck's noise level, spectrum gives that are cosmic-variance limited (with $\sigma$(r)=0.093), but show marginalized posterior peaks towards negative values at...
We present cosmological parameter constraints using maps from the last Planck data release (PR4). In particular, we detail an upgraded version of cosmic microwave background likelihood, HiLLiPoP , that is based on angular power spectra and relies a physical modeling foreground residuals in spectral domain. This new likelihood retains larger sky fraction (up to 75%) uses extended multipole range. Using this along with low- ℓ measurements LoLLiPoP derived ΛCDM parameters are good agreement...
view Abstract Citations (248) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Latitude Galactic Emission in the COBE Differential Microwave Radiometer 2 Year Sky Maps Kogut, A. ; Banday, J. Bennett, C. L. Gorski, K. M. Hinshaw, G. Reach, W. T. We cross-correlate COBE6 DMR year sky maps with spatial templates from long-wavelength radio surveys and far-infrared DIRBE maps. place an upper limit on spectral index of synchrotron radiation...
We apply the Gabor transform methodology proposed by Hansen et al. to WMAP data in order test statistical properties of cosmic microwave background (CMB) fluctuation field and specifically evaluate fundamental assumption cosmological isotropy. In particular, we with several apodization scales, thus allowing determination positional dependence angular power spectrum either high spatial localization or resolution (i.e. narrow bins multipole space). Practically, this implies that estimate...