4-Year COBE DMR Cosmic Microwave Background Observations: Maps and Basic Results

Abstract

The cosmic microwave background radiation provides unique constraints on cosmological models. In this Letter we present a summary of the spatial properties of the cosmic microwave background radiation based on the full 4 years of COBE DMR observations, as detailed in a set of companion Letters. The anisotropy is consistent with a scale-invariant power law model and Gaussian statistics. With full use of the multi-frequency 4-year DMR data, including our estimate of the effects of Galactic emission, we find a power-law spectral index of $n=1.2\pm 0.3$ and a quadrupole normalization $Q_{rms-PS}=15.3_{-2.8}^{+3.8}$ $\mu$K. For $n=1$ the best-fit normalization is $Q_{rms-PS}{|}_{n=1}=18\pm 1.6$ $\mu$K. These values are consistent with both our previous 1-year and 2-year results. The results include use of the $\ell =2$ quadrupole term; exclusion of this term gives consistent results, but with larger uncertainties. The 4-year sky maps, presented in this Letter, portray an accurate overall visual impression of the anisotropy since the signal-to-noise ratio is ~2 per 10 degree sky map patch. The improved signal-to-noise ratio of the 4-year maps also allows for improvements in Galactic modeling and limits on non-Gaussian statistics.

11 pages plus 2 PostScript figures. Figures 2 and 4 are not included, but are available upon request to [email protected]. Submitted to The Astrophysical Journal (Letters)

References in corpus (6)

• Microwave Emission at High Galactic Latitudes
• Power Spectrum of Primordial Inhomogeneity Determined from the 4-Year COBE DMR Sky Maps
• 2-Point Correlations in the COBE DMR 4-Year Anisotropy Maps
• Tests for Non-Gaussian Statistics in the DMR Four-Year Sky Maps
• Band Power Spectra in the COBE DMR 4-Year Anisotropy Maps
• Angular Power Spectrum of the Microwave Background Anisotropy seen by the COBE Differential Microwave Radiometer

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• The Stochastic Gravitational-Wave Background and the Inflation to Radiation Transition in the Early Universe
• Density Fluctuations and Primordial Black Hole Formation in Natural Double Inflation in Supergravity
• Modular inflation and the orthogonal axion as curvaton
• The Sky Polarization Observatory
• Probing large-distance higher-dimensional gravity with Cosmic Microwave Background measurements
• Towards a Continuous Record of the Sky
• CMB anisotropy at degree angular scales and the thermal history of the Universe
• Non-Gaussianity of Large-Scale Cosmic Microwave Background Anisotropies beyond Perturbation Theory
• Prospects for Direct Detection of Inflationary Gravitational Waves by Next Generation Interferometric Detectors
• Second-Order Corrections to the Power Spectrum in the Slow-Roll Expansion with a Time-Dependent Sound Speed
• Inflationary Features and Shifts in Cosmological Parameters from Planck 2015 Data
• A Gravity Dual of Ultra-slow Roll Inflation
• Inflation as a spontaneous symmetry breaking of Weyl symmetry
• Sensitivity of wide band detectors to quintessential gravitons
• Global cluster morphology and its evolution: X-ray data vs CDM, LCDM and mixed models
• Cosmological Imprints of Pre-Inflationary Particles
• Observational Constraints on Dynamical Dark Energy Models
• The CMB Quadrupole in a Polarized Light
• Reconstructing the spectrum of the pregalactic density field from astronomical data
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• Cosmology on all scales: a two-parameter perturbation expansion
• Constraints on Cosmological Parameters from the Lyman-alpha Forest Power Spectrum and COBE-DMR
• The Linearity of the Cosmic Expansion Field from 300 to 30,000 km/s and the Bulk Motion of the Local Supercluster with Respect to the CMB
• Warm Gas and Ionizing Photons in the Local Group (ApJL version)
• Observational Constraints on Open Inflation Models
• One-loop corrections to the power spectrum in general single-field inflation
• Retrieving cosmological information from small-scale CMB foregrounds II. The kinetic Sunyaev Zel'dovich effect
• Decaying Neutrinos and Large Scale Structure Formation
• Large Slow Roll Parameters in Single Field Inflation
• Slow-roll inflation and CMB anisotropy data
• The WMAP normalization of inflationary cosmologies
• A small universe after all?
• Space-time Evolution and CMB Anisotropies from Quantum Gravity
• Using SuZIE arcminute-scale CMB anisotropy data to probe open and flat-ΛCDM cosmogonies
• Cosmological Constraints from High-Redshift Damped Lyman-Alpha Systems
• Bias in low-multipole CMB reconstructions
• Cosmological model-independent measurement of cosmic curvature using distance sum rule with the help of gravitational waves
• Graviton Mass, Quintessence and Oscillatory Character of the Universe Evolution
• Non-BPS Brane Cosmology
• Can Cosmic Shear Shed Light on Low Cosmic Microwave Background Multipoles?
• Open Inflationary Universes in the Induced Gravity Theory
• Foreground separation using a flexible maximum-entropy algorithm: an application to COBE data
• Cosmology Using Cluster Internal Velocity Dispersions
• A deep radio survey of the AKARI North Ecliptic Pole Field - WSRT 20 cm Radio survey description, observations and data reduction
• Topological inflation induced by a non-minimally coupled massive scalar field
• Limits Due to Instrumental Polarisation in CMB Experiments at Microwave Wavelengths
• Can residuals of the Solar system foreground explain low multipole anomalies of the CMB ?
• Large Scale Fluctuations in the X-Ray Background
• Sensitivity forecasts for the cosmological recombination radiation in the presence of foregrounds
• Production of Topological Defects at the End of Inflation
• Generation of circular polarization in CMB radiation via nonlinear photon-photon interaction
• Constraints on anisotropic properties of the universe in $f(Q,T)$ gravity theory
• Microwave Background Polarization as a Probe of Large-Angle Correlations
• Tensor Anisotropies in an Open Universe
• A directional continuous wavelet transform on the sphere
• Open Hybrid Inflation
• MAX 4 and MAX 5 CMB anisotropy measurement constraints on open and flat-Lambda CDM cosmogonies
• Production of topological defects at the end of inflation
• Curvature perturbation and waterfall dynamics in hybrid inflation
• Constraints on Gravitino Decay and the Scale of Inflation using CMB spectral distortions
• Probing the Universe's Tilt with the Cosmic Infrared Background Dipole
• Constraints on a Local Group X-ray Halo
• CMB Anisotropies Reveal Quantized Gravity
• Acceleration of the Universe
• Fluctuating annihilation cross sections and the generation of density perturbations
• String cosmology versus standard and inflationary cosmology
• Dual inflation
• Open inflation models and gravitational wave anisotropies in the CMB
• CMB dipoles and other low-order multipoles in the quasispherical Szekeres model
• Leptogenesis through direct inflaton decay to light particles
• Effects of Foreground Contamination on the Cosmic Microwave Background Anisotropy Measured by MAP
• Evidence for horizon-scale power from CMB polarization
• Tilted Hybrid Inflation
• Gamma-Ray Burst Precursors as the Remnant of the Thermal Radiation Initially Trapped in the Fireball
• New CMB Power Spectrum Constraints from MSAMI
• Mirage: a new iterative Map-Making code for CMB experiments
• Constraints on features in the inflationary potential from future Euclid data
• On the Amount of Gravitational Waves from Inflation
• Constraints on Omega_B, Omega_m and h from MAXIMA and BOOMERANG
• Sneutrino warm inflation in the minimal supersymmetric model
• New Cosmological Structures on Medium Angular Scales Detected with the Tenerife Experiments
• Large primordial gravitational wave background in a class of BSI Lambda-CDM models
• Supergravity Minimal Inflation and its Spectral Index Revisited
• Comparing and combining the Saskatoon, QMAP and COBE CMB maps
• COBE-DMR-Normalized Dark Energy Cosmogony
• The IAC-Bartol Cosmic Microwave Background Anisotropy Experiment: Results of the 1994 Campaign
• Modeling the large-scale power deficit with smooth and discontinuous primordial spectra
• Inflation and the Nature of Supersymmetry Breaking
• Symmetry and anti-symmetry of the CMB anisotropy pattern
• Gravitational backreaction on a cosmic string: Formalism
• The S1 Shell and Interstellar Magnetic Field and Gas near the Heliosphere
• Power Spectrum of Inflationary Attractors
• Grand Unified Inflation Confronts WMAP
• Tilt and Running of Cosmological Observables in Generalized Single-Field Inflation
• Millimetric Ground-based Observations of Cosmic Microwave Background Anisotropy
• Estimations of total mass and energy of the universe
• Comparing and combining CMB datasets
• Response of VIRGO detectors to pre-big-bang gravitons
• Imprints of the Metrically-coupled Dilaton on Density Perturbations in Inflationary Cosmology
• Constraints On The Topology Of The Universe From The WMAP First-Year Sky Maps
• The CMB power spectrum at l=30-200 from QMASK
• Non-Gaussianity in three fluid curvaton model
• Normal Parameters for an Analytic Description of the CMB Cosmological Parameter Likelihood
• Implications of a dilaton in gauge theory and cosmology
• Cosmic microwave background power spectrum estimation with the destriping technique
• The Cosmic Microwave Background: State of the Art
• The lepton asymmetry: the last chance for a critical-density cosmology?
• A Note on Noncommutative Brane Inflation
• Probing Large-Angle Correlations with the Microwave Background Temperature and Lensing Cross Correlation
• Complete power spectrum for an induced gravity open inflation model
• Trade-off between angular resolution and straylight contamination in CMB anisotropy experiments. II. Straylight evaluation
• Morphology of High-Multiplicity Events in Heavy Ion Collisions
• Cosmological parameters from complementary observations of the Universe
• Concerning Parameter Estimation Using the Cosmic Microwave Background
• Implementation of a Fourier Matched Filter in CMB Analyses. Application to ISW Studies
• Kinetic mixing and symmetry breaking dependent interactions of the dark photon
• Non-Gaussian Foreground Residuals of the WMAP First Year Maps
• Time evolution of the perturbations for a complex scalar field in Friedmann-Lemaitre universe
• A Preferred-Direction Statistic for Sky Maps
• Mixed Models with n>1 and Large Scale Structure constraints
• Non-thermal leptogenesis via direct inflaton decay without SU(2)(L) triplets
• Cosmic acceleration with bulk viscosity in an anisotropic $f(R,L_m)$ background
• Chaplygin inflation in loop quantum cosmology
• Cosmological Baryon Asymmetry and Neutrinos: Baryogenesis via Leptogenesis in Supersymmetric Theories
• Quintessence-the Dark Energy in the Universe?
• Realizations of Hybrid Inflation in Supergravity with natural initial conditions
• Unification of cosmological scalar fields
• Inflation and the dwarf galaxy problem
• Inflaton Two-Point Correlation in the Presence of a Cosmic String
• Clustering tomography: measuring cosmological distances through angular clustering in thin redshift shells
• Topological Defects and CMB anisotropies : Are the predictions reliable ?
• CMB anisotropy predictions for a model of double inflation
• Gaussian Peaks and Clusters of Galaxies
• Non-linear Preheating with Scalar Metric Perturbations
• Scale Invariance of Rich Cluster Abundance: A Possible Test for Models of Structure Formation
• Topological Inflation in Supergravity
• Anisotropic universe with anisotropic dark energy
• Data compression on the sphere
• Non-Gaussianity in KKLMMT model
• Sifting Convolution on the Sphere
• Constraints on Natural Inflation from Cosmic Microwave Background
• Nonlinear superhorizon perturbations of non-canonical scalar field
• Inflation in f(R,T) gravity with Double-Well potential
• From CFT Spectra to CMB Multipoles in Quantum Gravity Cosmology
• Graviton mass and total relative density of mass Omega_tot in Universe
• Cosmological horizon entropy and generalised second law for flat Friedmann Universe
• Minimalism in Inflation Model Building
• Redshift Evolution of the Nonlinear Two-Point Correlation Function
• Observational Implications of Axionic Isocurvature Fluctuations
• A built-in scale in the initial spectrum of density perturbations: evidence from cluster and CMB data
• Correlated Hybrid Fluctuations from Inflation with Thermal Dissipation
• Constraining the history of reheating with the NANOGrav 15-year data
• COSMOSOMAS: A Circular Scanning Instrument to Map the Sky at Centimetric Wavelengths
• The Power Spectrum of Microwave Background Temperature Anisotropies Measured by the Tenerife Experiment
• Modular Inflation at Higher Level $N$
• What have we already learned from the CMB?
• CMB Polarization at Large Angular Scales: Data Analysis of the POLAR Experiment
• $\delta T/T$ and Neutrino Masses in SU(5)
• Glauber theory and the quantum coherence of curvature inhomogeneities
• Effect of massive fields on inflation
• Determining cosmic microwave background structure from its peak distribution
• Nonlinear curvature perturbations in an exactly soluble model of multi-component slow-roll inflation
• Blue spectra and induced formation of primordial black holes
• Post-inflation increase of the cosmological tensor-to-scalar perturbation ratio
• Timelike Vector Field Dynamics in the Early Universe
• Angular Inflation from Supergravity
• Bianchi V inflation in the Brans-Dicke theory?
• Revisiting the alignment of radio galaxies in the ELAIS-N1 field
• Observing imprints of black hole event horizon on X-ray spectra
• Lambda-inflation and CMB anisotropy
• Effective Search Templates for a Primordial Stochastic Gravitational Wave Background
• Light Scalars and the Generation of Density Perturbations During Preheating or Inflaton Decay
• Predictions of mixed non-Gaussian cosmological density fields for the cosmic microwave background radiation
• Cosmological constraints on dark energy
• Brane inflation revisited after WMAP five-year results
• Isotropization of Bianchi type models and a new FRW solution in Brans-Dicke theory
• Abundance and evolution of galaxy clusters in cosmological models with massive neutrino
• Particle Creation in Pre-Big-Bang Cosmology: theory and observational consequences
• Holographic Inflation
• Determining Cosmological Parameters from the Microwave Background
• Why CMB physics?
• Direct Optimal Mapping for 21cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array
• Amplitude-Phase Analysis of Cosmic Microwave Background maps
• Clustering of Superstring Loops
• A relativistic calculation of super-Hubble suppression of inflation with thermal dissipation
• Remote Dipole Field Reconstruction with Dusty Galaxies
• CMB and Large Scale Structure as a test of Mixed Models with n>1
• Geometric Gaussianity and Non-Gaussianity in the Cosmic Microwave Background
• Higher-order gravity in higher dimensions: Geometrical origins of four-dimensional cosmology?
• Microwave background anisotropies in quasiopen inflation
• Can induced gravity isotropize Bianchi I, V, or IX Universes?
• Implications of the BOOMERANG and MAXIMA-I results for the Baryon Mass Fraction in Clusters of galaxies
• WMAP Polarization Results
• Calculation of Cosmic Background Radiation Anisotropies and Implications
• Are quasars reliable standard candles?
• Decoherence Problem in Ekpyrotic Phase
• Foreground removal with ILC methods for AliCPT-1
• Measuring the Density Fluctuation From the Cluster Gas Mass Function
• Effect of gravitational field self-interaction on large structure formation
• Curvaton as dark matter with secondary inflation
• Beyond $\Lambda$CDM: Exploring a Dynamical Cosmological Constant Framework Consistent with Late-Time Observations
• Modelling the WMAP large-angle anomalies as an effect of a local density inhomogeneity
• An Unbiased Estimator of the Full-sky CMB Angular Power Spectrum at Large Scales using Neural Networks
• Small-scale structure of cold dark matter
• First Results from the Arcminute Cosmology Bolometer Array Receiver
• Fast, exact (but unstable) spin spherical harmonic transforms
• Vacuum selection by inflation as the origin of the dark energy
• Estimation of Full Sky Power Spectrum between Intermediate to Large Angular Scales from Partial Sky CMB Anisotropies using Artificial Neural Network
• The roughness of the last scattering surface
• Let there be Light: the Emergence of Structure out of the Dark Ages in the Early Universe
• Plateau Inflation from Random Non-Minimal Coupling
• Generalised inflation with a gravitational wave background
• Post-Inflationary Reheating
• Cosmology Large Angular Scale Surveyor (CLASS): 90 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• Cosmological parameter determination from Planck and SDSS data in LambdaCHDM cosmologies
• Investigating the $w$CDM Model with Latest DESI BAO Observations
• CMB Anisotropy Constraints on Flat-Lambda and Open CDM Cosmogonies from DMR, UCSB South Pole, Python, ARGO, MAX, White Dish, OVRO, and SuZIE Data
• Systematic error mitigation for the PIXIE Fourier transform spectrometer
• Constraints on Bianchi-I type universe with SH0ES anchored Pantheon+ SNIa data
• Controlling systematics in ground-based CMB surveys with partial boresight rotation
• Cosmic microwave background anisotropies seeded by incoherent sources
• One Extension to Explain Them All, One Scale-Invariant Spectrum to Test Them All, and in One Model Bind Them
• D-term inflation and neutrino mass
• Supersymmetric hybrid inflation with non-minimal coupling to gravity
• Initial condition for new inflation in supergravity
• Monopole Inflation in Brans-Dicke Theory
• Motion induced second order temperature and y-type anisotropies after the subtraction of linear dipole in the CMB maps
• The primordial non-Gaussianity of local type (f_NL) in the WMAP 5-year data: the length distribution of CMB skeleton
• Cross-correlation of the 2-10 keV XRB with radio sources: constraining the large-scale structure of the x-ray background
• Ruling out a critical density baryonic universe
• CMB Angular Power Spectrum from Correlated Primordial Fluctuation
• Modified Cold-Dark-Matter models in light of 53W091 an old galaxy at high z
• Gravitational Field of a Spinning Cosmic String
• Slepian Scale-Discretised Wavelets on the Sphere
• Scale invariance of the primordial tensor power spectrum
• The No-defect Conjecture: Cosmological Implications
• The effect of reionization on the COBE normalization
• CO Component Estimation Based on the Independent Component Analysis
• A Thermal Graviton Background from Extra Dimensions
• 20+ years of Inflation
• The estimation of the noise in cosmic microwave background anisotropy experiments
• Breathing Comoving Hubble: Initial Condition and Eternity in view of the trans-Planckian Censorship Conjecture
• Blind Map Level Systematics Cleaning: A Quadratic Estimator Approach
• Cosmoglobe DR1. III. First full-sky model of polarized synchrotron emission from all WMAP and Planck LFI data
• Unraveling the CMB lack-of-correlation anomaly with the cosmological gravitational wave background
• A Vishniac type contribution to the polarisation of the CMBR?
• Low-scale supergravity inflation with R-symmetry
• Polarization of the Microwave Background: theoretical framework
• A model of cosmology and particle physics at an intermediate scale
• BICEP2, non Bunch-Davies and Entanglement
• Likelihood Analysis for Mega-Pixel Maps
• Constraining primordial vector mode from B-mode polarization
• The nonlinear anisotropic model of the Universe with the linear potential
• The picture of our universe: A view from modern cosmology
• Polarization Calibration of a Microwave Polarimeter with Near-Infrared Up-Conversion for Optical Correlation and Detection
• On the regularity of the covariance matrix of a discretized scalar field on the sphere
• Bound to bounce: a coupled scalar-tachyon model for a smooth bouncing/cyclic universe
• Variations of the Fine Structure Constant in Space and Time
• Impact of the vector dark matter on polarization of the CMB photon
• Likelihood distribution for models with cosmological constant from COBE data
• Density and Graviton Perturbations in the Cosmic Microwave Background
• The effect of signal digitisation in CMB experiments
• Development of the Universe and New Cosmology
• L-BASS: a project to produce an absolutely calibrated 1.4 GHz sky map, I -- Scientific rationale and system overview
• Constraining Inflationary Scenarios with Braneworld Models and Second Order Cosmological Perturbations
• Cosmological Consequences of String Axions
• In Support of Inflation
• Cosmological implications of neutrinos
• A Model of Large Quintessence Isocurvature Fluctuations and Low CMB Quadrupole
• Eigenvalues of the Stewart-Lyth equation for inflation with a blue spectrum
• CMB constraints on spatial variations of the vacuum energy density
• Baryogenesis via Density Fluctuations with a Second Order Electroweak Phase Transition
• Effect of the field self-interaction of General Relativity on the Cosmic Microwave Background Anisotropies
• Cosmological correlation functions in scalar and vector inflationary models
• Skewness in the Cosmic Microwave Background Anisotropy from Inflationary Gravity Wave Background
• An Inflationary Scenario Taking into Account of Possible Dark Energy Effects in the Early Universe
• Polarized CMB recovery with sparse component separation
• Reheating constraints and the $H_0$ tension in Quintessential Inflation
• Dynamical Dark Energy Signatures from a New Transition $Om(z)$ Parametrization in Flat FLRW Cosmology
• Nearly Full-Sky Low-Multipole Cosmic Microwave Background Temperature Anisotropy: II. Angular Power Spectra and Likelihood
• Baryon density extraction and isotropy analysis of Cosmic Microwave Background using Deep Learning
• Primordial Black Holes in non-linear perturbation theory
• Analytic Correlation of Inflationary Potential to Power Spectrum Shape: Limits of Validity, and `No-Go' for Small Field Model Analytics
• Prospects of Cosmic Superstring Detection through Microlensing of Extragalactic Point-Like Sources
• Cosmological parameters from observational data on the large scale structure of the Universe
• CMB delensing with deep learning
• On the contribution of density perturbations and gravitational waves to the lower order multipoles of the Cosmic Microwave Background Radiation
• Reconstruction of full sky CMB $\mathbf{E}$ and $\mathbf{B}$ modes spectra removing $\mathbf{E}$-to-$\mathbf{B}$ leakage from partial sky using deep learning
• Imprints of Anisotropy on the Power Spectrum in Matter Dominated Bouncing Universe as Background
• Radioactivities in Population Studies: 26Al and 60Fe from OB Associations
• Physics of Cosmic Microwave Background anisotropies and primordial fluctuations
• Making a Universe
• Neural networks as a tool for parameter estimation in astrophysical data
• Scaling properties of the cosmic background plasma and radiation
• The BaR-SPOrt Experiment
• Power Suppression and Lensing Anomaly -- A phenomenological investigation
• On observational signatures of multi-fractional theory
• Scale-free power spectrums in the delayed cosmology
• Optimal bolometer transfer function deconvolution for CMB experiments through maximum likelihood mapmaking
• Small scale structure predictions from discrete symmetry breaking - early quasar formation
• Spectator fields and their imprints on the Cosmic Microwave Background
• Cosmology 1996
• CMB Observational Techniques and Recent Results
• SUSY, Inflation and the Origin of Matter in the Universe
• Phenomenology and Cosmology of Supersymmetric Grand Unified Theories
• Birth and Growth of Two-dimensional Universe
• CMB line-of-sight integrators for nearly-isotropic cosmological models
• Do We Have Sufficient Knowledge of the Galactic Foreground Emission in Cosmic Microwave Background Science?
• Quantum noises and the large scale structure
• A new approach to the Sachs-Wolfe effect
• Self-restriction of Gravitational Field and its Role in the Universe
• Observations of the Cosmic Microwave Background and Implications for Cosmology and Large Scale Structure
• Inflationary spectral tilts as a result of the dilatation symmetry breaking
• Dark Matter Phenomenology: Sterile Neutrino Portal and Gravitational Portal in Extra-Dimensions
• A GMRT 610 MHz radio survey of the North Ecliptic Pole (NEP, ADF-N) / Euclid Deep Field North
• Implications of correlations and fluctuations in small systems
• Stationary Points of Scalar Fields Coupled to Gravity
• Ring of attraction: overlapping directions of the dipole modulation of the CMB, the parity asymmetry, and kinematic dipole percolation zone
• Non-Gaussianity in Cosmology: from Inflation to the CMB
• Integrated Markov Chain Monte Carlo (MCMC) analysis of primordial non-Gaussianity (f_NL) in the recent CMB data