Measurements of Anisotropy in the Cosmic Microwave Background Radiation at 0\fdg5 Scales near the Stars HR5127 and Phi Herculis

Abstract

We present measurements of cosmic microwave background (CMB) anisotropy near the stars HR5127 and Phi Herculis from the fifth flight of the Millimeter-wave Anisotropy eXperiment (MAX). We scanned 8\arcdeg\ strips of the sky with an approximately Gaussian 0\fdg5 FWHM beam and a 1\fdg4 peak to peak sinusoidal chop. The instrument has four frequency bands centered at 3.5, 6, 9, and 14~cm${}^{-1}$. The IRAS 100~\micron\ map predicts that these two region have low interstellar dust contrast. The HR5127 data are consistent with CMB anisotropy. The Phi Herculis data, which were measured at lower flight altitudes, show time variability at 9 and 14~cm${}^{-1}$ which we believe to be due to atmospheric emission. However, the Phi Herculis data at 3.5 and 6~cm${}^{-1}$ are essentially independent of this atmospheric contribution and are consistent with CMB anisotropy. Confusion from galactic foregrounds is unlikely based on the spectrum and amplitude of the structure at these frequencies. If the observed HR5127 structure and the atmosphere independent Phi Herculis structure are attributed to CMB anisotropy, then we find $\Delta T/T=⟨\frac{l(l+1)C_l}{2\pi }{⟩}^{1/2}=1.2_{-0.3}^{+0.4}\times 10^{-5}$ for HR5127 and $1.9_{-0.4}^{+0.7}\times 10^{-5}$ for Phi Herculis in the flat band approximation. The upper and lower limits represent a 68\% confidence interval added in quadrature with a 10\% calibration uncertainty.

17 pages, 2 Postscript figures, uses aasms4.sty

Cited by in corpus (28)

• Radical Compression of Cosmic Microwave Background Data
• Cosmic Microwave Background Anisotropies from Scaling Seeds: Global Defect Models
• What Can Cosmic Microwave Background Observations Already Say About Cosmological Parameters in Open and Critical-Density Cold Dark Matter Models?
• COBE-DMR-Normalized Open CDM Cosmogonies
• The Cosmic Microwave Background Radiation
• UCSB South Pole 1994 CMB anisotropy measurement constraints on open and flat-Lambda CDM cosmogonies
• CMB Anisotropy Constraints on Open and Flat-Lambda CDM Cosmogonies from UCSB South Pole, ARGO, MAX, White Dish, and SuZIE Data
• Cosmic microwave background constraints on the epoch of reionization
• CMB Anisotropy in COBE-DMR-Normalized Open CDM Cosmogony
• CMB Anisotropy in COBE-DMR-Normalized Flat $\Lambda$ CDM Cosmogony
• Analysis of cosmic microwave background data on an incomplete sky
• The BOOMERANG North America Instrument: a balloon-borne bolometric radiometer optimized for measurements of cosmic background radiation anisotropies from 0.3 to 4 degrees
• The Gravitational-Wave contribution to the CMB anisotropies
• CMB anisotropy at degree angular scales and the thermal history of the Universe
• Harmonic analysis of cosmic microwave background data II: from ring-sets to the sky
• Using SuZIE arcminute-scale CMB anisotropy data to probe open and flat-ΛCDM cosmogonies
• MAX 4 and MAX 5 CMB anisotropy measurement constraints on open and flat-Lambda CDM cosmogonies
• Large primordial gravitational wave background in a class of BSI Lambda-CDM models
• Python I, II, and III CMB Anisotropy Measurement Constraints on Open and Flat-Lambda CDM Cosmogonies
• The Cosmic Microwave Background: State of the Art
• Concerning Parameter Estimation Using the Cosmic Microwave Background
• ARGO CMB Anisotropy Measurement Constraints on Open and Flat-Lambda CDM Cosmogonies
• CMB anisotropy predictions for a model of double inflation
• Using White Dish CMB Anisotropy Data to Probe Open and Flat-Lambda CDM Cosmogonies
• From Local Velocities to Microwave Background
• Polarization of the Microwave Background: theoretical framework
• Testing the CMB Data for Systematic Effects
• Observations of the Cosmic Microwave Background and Implications for Cosmology and Large Scale Structure