DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum

Abstract

We present measurements of anisotropy in the Cosmic Microwave Background (CMB) from the first season of observations with the Degree Angular Scale Interferometer (DASI). The instrument was deployed at the South Pole in the austral summer 1999--2000, and made observations throughout the following austral winter. We have measured the angular power spectrum of the CMB in the range 100<l<900 with high signal-to-noise. In this paper we review the formalism used in the analysis, in particular the use of constraint matrices to project out contaminants such as ground and point source signals, and to test for correlations with diffuse foreground templates. We find no evidence of foregrounds other than point sources in the data, and find a maximum likelihood temperature spectral index beta = -0.1 +/- 0.2 (1 sigma), consistent with CMB. We detect a first peak in the power spectrum at l approx 200, in agreement with previous experiments. In addition, we detect a peak in the power spectrum at l approx 550 and power of similar magnitude at l approx 800 which are consistent with the second and third harmonic peaks predicted by adiabatic inflationary cosmological models.

8 pages, 1 figure, minor changes in response to referee comments

References in corpus (1)

• First Intrinsic Anisotropy Observations with the Cosmic Background Imager

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• Halo Density Profiles Consistent with Asymmetric M-B Velocity Distributions-Implications on Direct Dark Matter Searches
• Bulk scalar field in brane-worlds with induced gravity inspired by the $\mathcal{L}(R)$ term
• Redshift estimation of clusters by wavelet decomposition of their Sunyaev-Zel'dovich morphology
• Stability analysis and observational constraints in scalar tensor theory
• Non-Minimal Cosmological Model in Modified Yang--Mills Theory
• The effect of supersymmetry breaking in the Mass Varying Neutrinos
• False Vacuum in the Supersymmetric Mass Varying Neutrinos Model
• About the connection between the $C_{\ell }$ power spectrum of the Cosmic Microwave Background and the ${\Gamma }_m$ Fourier spectrum of rings on the sky
• $f(R)$ Gravity and Crossing the Phantom Divide Barrier
• Raychaudhuri-based reconstruction of anisotropic Einstein-Maxwell equation in 1+3 covariant formalism of $f(R)$-gravity
• A Kaluza-Klein Inspired Brans-Dicke Gravity with Dark Matter and Dark Energy Model
• The Standard Model, Dark Matter, and Dark Energy: From the Sublime to the Ridiculous
• CMB and Cosmological Parameters: Current Status and Prospects
• Some characteristics of three exact solutions of Einstein equations minimally coupled to a Quintessence field
• Predicted modulated differential rates for direct WIMP searches at low energy transfers
• Dark energy from the gas of wormholes
• Scattering of scalar perturbations with cosmological constant in low-energy and high-energy regimes
• The ${\Omega }_{DE}-{\Omega }_M$ Plane in Dark Energy Cosmology
• Observational constraints in scalar tensor theory with tachyonic potential
• OVRO CMB Anisotropy Measurement Constraints on Flat-Lambda and Open CDM Cosmogonies
• The Fourth Gravity Test and Quintessence Matter Field
• Multi-component power spectra estimation method for multi-detector observations of the Cosmic Microwave Background
• Red Density Perturbations and Inflationary Gravitational Waves
• Cosmology Rounding the Cape
• Scalar field dark energy and Cosmic Microwave Background
• The interplay between high energy physics and cosmology: an example
• Predicted rates for direct WIMP searches
• Excessive shift of the CMB acoustic peaks of the Cold Spot area
• Is Stringy-Supersymmetry Quintessentially Challenged?
• An Inflationary Scenario Taking into Account of Possible Dark Energy Effects in the Early Universe
• Testing CMB polarization data using position angles
• Testing the CMB Data for Systematic Effects
• The shape of the CMB power spectrum
• Searching for light WIMPS in view of neutron decay to dark matter
• Natures of Statefinder Parameters and Om Diagnostic for Cardassian Universe in Horava-Lifshitz Gravity
• New Constraints on Dark Energy
• Exact Cosmological Models with the Yang - Mills Fields on Lyra Manifold
• Direct dark matter detection: The diurnal variation in directional experiments
• Numerical Analysis of the Primordial Power Spectrum for (Small Field) Inflationary Potentials
• Solar neutrinos as background in dark matter searches involving electron detection
• Cosmological constraints from Microwave Background Anisotropy and Polarization
• Constraints on scalar-tensor theories from observations
• Relativity principle with a low energy invariant scale
• Enabling Discoveries: Thirty Years of Advanced Technologies and Instrumentation at the National Science Foundation
• Correspondence between modified gravity and 5D Ricci-flat cosmologies
• Pico: Parameters for the Impatient Cosmologist
• Cosmology with CMB anisotropy
• Cosmic Acceleration Caused by the Extra-Dimensional Evolution in a Generalized Randall-Sundrum Model
• Dynamical effects of the neutrino gravitational clustering at Planck angular scales
• Multiple Peaks in the CMB
• Cosmological Parameter Estimation: Method
• Geometric and thermodynamic properties in Gauss-Bonnet gravity
• The CP Puzzle in the Strong Interactions
• An update on Archeops: flights and data products
• Cosmological Model of Interacting Phantom and Yang-Mills Fields
• Anisotropic evolution of D-dimensional FRW spacetime
• The Cosmic Microwave Background
• Cosmological implications from the observed properties of CMB
• Dark 2002 and Beyond
• Maps of the Cosmos: The Cosmic Microwave Background
• Dark energy, chaotic fields, and fundamental constants
• Cosmological models with the spinor and non-minimally interacting scalar field
• Cosmological quests in the CMB sky
• CMB Observational Techniques and Recent Results
• Recent Progress in Neutrino Astrophysics
• Thermodynamics of Apparent Horizon and Friedmann Equations in Big Bounce Universe
• Particle Astrophysics and Cosmology: Cosmic Laboratories for New Physics (Summary of the Snowmass 2001 P4 Working Group)
• Can accelerated expansion of the universe be due to spacetime vorticity?