Anisotropy in the Cosmic Microwave Background at Degree Angular Scales: Python V Results

Abstract

Observations of the microwave sky using the Python telescope in its fifth season of operation at the Amundsen-Scott South Pole Station in Antarctica are presented. The system consists of a 0.75 m off-axis telescope instrumented with a HEMT amplifier-based radiometer having continuum sensitivity from 37-45 GHz in two frequency bands. With a 0.91 deg x 1.02 deg beam the instrument fully sampled 598 deg^2 of sky, including fields measured during the previous four seasons of Python observations. Interpreting the observed fluctuations as anisotropy in the cosmic microwave background, we place constraints on the angular power spectrum of fluctuations in eight multipole bands up to l ~ 260. The observed spectrum is consistent with both the COBE experiment and previous Python results. There is no significant contamination from known foregrounds. The results show a discernible rise in the angular power spectrum from large (l ~ 40) to small (l ~ 200) angular scales. The shape of the observed power spectrum is not a simple linear rise but has a sharply increasing slope starting at l ~ 150.

5 pages

References in corpus (6)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Estimating the Power Spectrum of the Cosmic Microwave Background
• Galactic microwave emission at degree angular scales
• Mapping the CMB I: the first flight of the QMAP experiment
• Comparing Cosmic Microwave Background Datasets
• Mapping the CMB II: the second flight of the QMAP experiment

Cited by in corpus (35)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• The Microwave Anisotropy Probe (MAP) Mission
• Prospects for probing the dark energy via supernova distance measurements
• Foregrounds and Forecasts for the Cosmic Microwave Background
• Measurement of a Peak in the Cosmic Microwave Background Power Spectrum from the North American test flight of BOOMERANG
• Dark Energy and the CMB
• The Optical Design and Characterization of the Microwave Anisotropy Probe
• Binned Cosmic Microwave Background Anisotropy Power Spectra: Peak Location
• The Impact of Atmospheric Fluctuations on Degree-scale Imaging of the Cosmic Microwave Background
• Characterizing the Peak in the CMB Angular Power Spectrum
• Astronomy in Antarctica
• The Antarctic Submillimeter Telescope and Remote Observatory (AST/RO)
• An Australia telescope survey for CMB anisotropies
• Bayesian `Hyper-Parameters' Approach to Joint Estimation: The Hubble Constant from CMB Measurements
• The QMAP and MAT/TOCO Experiments for Measuring Anisotropy in the Cosmic Microwave Background
• Supernova data may be unable to distinguish between quintessence and k-essence
• First Results from Viper: Detection of Small-Scale Anisotropy at 40 GHZ
• Analysis of cosmic microwave background data on an incomplete sky
• Window Function for Non-Circular Beam CMB Anisotropy Experiment
• Harmonic analysis of cosmic microwave background data II: from ring-sets to the sky
• Cosmic string lens effects on CMB polarization patterns
• Galactic Foregrounds in OVRO and UCSB South Pole 1994 Cosmic Microwave Background Anisotropy Data
• Effects of Foreground Contamination on the Cosmic Microwave Background Anisotropy Measured by MAP
• Galactic Foreground Constraints from the Python V Cosmic Microwave Background Anisotropy Data
• Cosmic Microwave Background Anisotropy Measurement From Python V
• Topological Defects and CMB anisotropies : Are the predictions reliable ?
• The History of Astrophysics in Antarctica
• Correlation of the South Pole 94 data with 100microns and 408 MHz maps
• A Spin Modulated Telescope to Make Two Dimensional CMB Maps
• Can inflationary models of cosmic perturbations evade the secondary oscillation test?
• Goodness--of--fit Statistics and CMB Data Sets
• Testing the CMB Data for Systematic Effects
• Cosmic Microwave Background: Past, Future, and Present
• A characterization of the diffuse Galactic emissions at large angular scales using the Tenerife data