A5052249023- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Superconducting and THz Device Technology
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Relativity and Gravitational Theory
- Particle physics theoretical and experimental studies
- Adaptive optics and wavefront sensing
- Microwave Engineering and Waveguides
- Solar and Space Plasma Dynamics
- Space Science and Extraterrestrial Life
- Computational Physics and Python Applications
- Neutrino Physics Research
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Spacecraft and Cryogenic Technologies
Princeton University
2016-2025
Columbia University
2023
University of Michigan–Ann Arbor
2023
University of Technology Sydney
2016
Royal College of Midwives
2016
King's College London
2016
Griffith University
2016
Max Planck Institute for Radio Astronomy
2015
Max Planck Society
2015
Johns Hopkins University
2014
WMAP precision data enables accurate testing of cosmological models. We find that the emerging standard model cosmology, a flat Lambda-dominated universe seeded by nearly scale-invariant adiabatic Gaussian fluctuations, fits data. With parameters fixed only data, we can fit finer scale CMB measurements and large scle structure (galaxy surveys Lyman alpha forest). This simple is also consistent with host other astronomical measurements. then to combination experiments (ACBAR CBI), 2dFGRS...
SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP*) OBSERVATIONS: COSMOLOGICAL INTERPRETATION, E. Komatsu, K. M. Smith, J. Dunkley, C. L. Bennett, B. Gold, G. Hinshaw, N. Jarosik, D. Larson, R. Nolta, Page, Spergel, Halpern, S. Hill, A. Kogut, Limon, Meyer, Odegard, Tucker, Weiland, Wollack, Wright
A simple cosmological model with only six parameters (matter density, Ωmh2, baryon Ωbh2, Hubble constant, H0, amplitude of fluctuations, σ8, optical depth, τ, and a slope for the scalar perturbation spectrum, ns) fits not 3 year WMAP temperature polarization data, but also small-scale CMB light element abundances, large-scale structure observations, supernova luminosity/distance relationship. Using data only, best-fit values power-law flat Λ cold dark matter (ΛCDM) are (Ωmh2,Ωbh2,h,ns,τ,σ8)...
(Abridged) The WMAP 5-year data strongly limit deviations from the minimal LCDM model. We constrain physics of inflation via Gaussianity, adiabaticity, power spectrum shape, gravitational waves, and spatial curvature. also properties dark energy, parity-violation, neutrinos. detect no convincing parameters model, derived combined with distance measurements Type Ia supernovae (SN) Baryon Acoustic Oscillations (BAO), are: Omega_b=0.0456+-0.0015, Omega_c=0.228+-0.013, Omega_Lambda=0.726+-0.015,...
We present full sky microwave maps in five bands (23 to 94 GHz) from the WMAP first year survey. Calibration errors are <0.5% and low systematic error level is well specified. The 21 per mode l=658. temperature-polarization cross-power spectrum reveals both acoustic features a large angle correlation reionization. optical depth of reionization 0.17 +/- 0.04, which implies epoch 180+220-80 Myr (95% CL) after Big Bang at redshift 20+10-9 for range ionization scenarios. This early...
We present cosmological parameter constraints based on the final nine-year Wilkinson Microwave Anisotropy Probe (WMAP) data, in conjunction with a number of additional data sets. The WMAP alone, and combination, continue to be remarkably well fit by six-parameter ΛCDM model. When are combined measurements high-l cosmic microwave background anisotropy, baryon acoustic oscillation scale, Hubble constant, matter energy densities, Ωbh2, Ωch2, ΩΛ, each determined precision ∼1.5%. amplitude...
The Wilkinson Microwave Anisotropy Probe WMAP has mapped the entire sky in five frequency bands between 23 and 94 GHz with polarization sensitive radiometers. We present three-year full-sky maps of analyze them for foreground emission cosmological implications. These observations open up a new window understanding universe. observes significant levels polarized due to both Galactic synchrotron radiation thermal dust emission. least contaminated channel is at 61 GHz. Informed by model...
We present the final nine-year maps and basic results from WMAP mission. provide new full sky temperature that were processed to reduce asymmetry of effective beams. Temperature polarization are examined separate CMB anisotropy foreground emission, both types signals analyzed in detail. The mission has resulted a highly constrained LCDM cosmological model with precise accurate parameters agreement host other measurements. When data combined finer scale CMB, baryon acoustic oscillation,...
This paper focuses on cosmological constraints derived from analysis of WMAP data alone. A simple ΛCDM model fits the five-year temperature and polarization data. The basic parameters are consistent with three-year now better constrained: Ωbh2 = 0.02273 ± 0.00062, Ωch2 0.1099 0.0062, ΩΛ 0.742 0.030, ns 0.963+0.014−0.015, τ 0.087 0.017, σ8 0.796 0.036, h 0.719+0.026−0.027. With five years data, we have measured optical depth to reionization, τ>0, at 5σ significance. redshift an instantaneous...
We present new full-sky temperature and polarization maps in five frequency bands from 23 to 94 GHz, based on data the first years of Wilkinson Microwave Anisotropy Probe (WMAP) sky survey. The are consistent with previous more sensitive. five-year incorporate several improvements processing made possible by additional a complete analysis instrument calibration in-flight beam response. tests for systematic errors conclude that W-band is not yet suitable cosmological studies, but we suggest...
The WMAP mission has produced sky maps from seven years of observations at L2. We present the angular power spectra derived seven-year and discuss cosmological conclusions that can be inferred data alone. With data, temperature (TT) spectrum measurement a signal-to-noise ratio per multipole exceeds unity for l < 919; in band powers width Δl = 10, up to 1060. third acoustic peak TT is now well measured by WMAP. In context flat ΛCDM model, this improvement allows us place tighter constraints...
We confront predictions of inflationary scenarios with the WMAP data, in combination complementary small-scale CMB measurements and large-scale structure data. The detection a large-angle anti-correlation temperature--polarization cross-power spectrum is signature adiabatic superhorizon fluctuations at time decoupling. data are described by pure fluctuations: we place an upper limit on correlated CDM isocurvature component. Using constraints shape scalar power amplitude gravity waves,...
New full-sky temperature and polarization maps based on seven years of data from WMAP are presented. The new results consistent with previous results, but have improved due to reduced noise the additional integration time, knowledge instrument performance, analysis procedures. improvements described in detail. seven-year set is well fit by a minimal six-parameter flat ΛCDM model. parameters for this model, using conjunction baryon acoustic oscillation Sloan Digital Sky Survey priors H0...
The WMAP mission has mapped the full sky to determine geometry, content, and evolution of universe. Full-sky maps are made in five microwave frequency bands separate temperature anisotropy cosmic background (CMB) from foreground emission, including diffuse Galactic emission extragalactic point sources. We define masks that excise regions high so CMB analyses can be carried out with minimal contamination. also present spectra individual components, leading an improved understanding...
We present new full-sky temperature maps in five frequency bands from 23 to 94 GHz, based on the first three years of WMAP sky survey. The maps, which are consistent with first-year and more sensitive, incorporate improvements data processing made possible by additional a complete analysis polarization signal. These include refinements gain calibration beam response models. employ two forms multi-frequency separate astrophysical foreground signals CMB, each improves our analyses. First, we...
The Wilkinson Microwave Anisotropy Probe (WMAP) has mapped the full sky in Stokes I, Q, and U parameters at frequencies of 23, 33, 41, 61, 94 GHz. We detect correlations between temperature polarization maps significant more than 10 σ. are inconsistent with instrument noise significantly larger upper limits established for potential systematic errors. present all WMAP frequency bands similar amplitude from 23 to GHz consistent a superposition cosmic microwave background (CMB) signal weak...
We present the angular power spectrum derived from first-year Wilkinson Microwave Anisotropy Probe (WMAP) sky maps. study a variety of estimation methods and data combinations demonstrate that results are robust. The modestly contaminated by diffuse Galactic foreground emission, but we show simple template model is sufficient to remove signal. Point sources produce modest contamination in low frequency data. After masking ~700 known bright maps, estimate residual contribute ~3500 uK^2 at 41...
We present limits to the amplitude of non-Gaussian primordial fluctuations in WMAP 1-year cosmic microwave background sky maps. A non-linear coupling parameter, f_NL, characterizes a quadratic term potential. use two statistics: one is cubic statistic which measures phase correlations temperature after combining all configurations angular bispectrum. The other uses Minkowski functionals measure morphology Both methods find data consistent with Gaussian and establish limits, -58
We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from Atacama Cosmology Telescope, using data taken 2013-2016 at 98 150 GHz. The cover more than 17,000 deg$^2$, deepest 600 deg$^2$ with noise levels below 10 $\mu$K-arcmin. use power spectrum derived almost 6,000 these to constrain cosmology. ACT enable a measurement angular scale features in both divergence-like anisotropy, tracing velocity density last-scattering. From one...
(Abridged) A simple six-parameter LCDM model provides a successful fit to WMAP data, both when the data are analyzed alone and in combination with other cosmological data. Even so, it is appropriate search for any hints of deviations from now standard cosmology, which includes inflation, dark energy, matter, baryons, neutrinos. The community has subjected extensive varied analyses. While there widespread agreement as overall success model, various "anomalies" have been reported relative that...
We describe our methodology for comparing the Wilkinson Microwave Anisotropy Probe (WMAP) measurements of cosmic microwave background (CMB) and other complementary data sets to theoretical models. The unprecedented quality WMAP tight constraints on cosmological parameters that are derived require a rigorous analysis so approximations made in modeling do not lead significant biases. use likelihood function characterize statistical properties sky. outline Monte Carlo Markov Chains explore...
The purpose of the MAP mission is to determine geometry, content, and evolution universe via a 13' full width half-maximum (FWHM) resolution full-sky map temperature anisotropy cosmic microwave background radiation with uncorrelated pixel noise, minimal systematic errors, multifrequency observations, accurate calibration. These attributes were key factors in success NASA's Cosmic Background Explorer (COBE) mission, which made 7° FWHM sky map, discovered anisotropy, characterized fluctuations...
We present updated estimates of Galactic foreground emission using seven years WMAP data. Using the power spectrum differences between multi-frequency template-cleaned maps, we find no evidence for contamination outside (KQ85y7) mask. place a 15 μK upper bound on rms in cleaned maps used cosmological analysis. Further, cleaning process requires only three power-law foregrounds polarized beyond those from soft (steep-spectrum) synchrotron and thermal dust emission; particular indication...
We present constraints on cosmological and astrophysical parameters from high-resolution microwave background maps at 148 GHz 218 made by the Atacama Cosmology Telescope (ACT) in three seasons of observations 2008 to 2010. A model primary secondary foreground is fit map power spectra lensing deflection spectrum, including contributions both thermal Sunyaev-Zeldovich (tSZ) effect kinematic (kSZ) effect, Poisson correlated anisotropy unresolved infrared sources, radio correlation between tSZ...
We present the temperature and polarization angular power spectra of cosmic microwave background derived from first five years Wilkinson Microwave Anisotropy Probe data. The five-year spectrum is variance limited up to multipole ℓ = 530, individual ℓ-modes have signal-to-noise ratio S/N >1 for < 920. best-fitting six-parameter ΛCDM model has a reduced χ2 33–1000 χ2/ν 1.06, with probability exceed 9.3%. There now significantly improved data near third peak which leads cosmological...