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Title:
A limit of the anisotropy of the microwave background radiation on arc minute scales
Authors:
Readhead, A. C. S.; Lawrence, C. R.; Myers, S. T.; Sargent, W. L. W.; Hardebeck, H. E.; Moffet, A. T.
Affiliation:
AA(Owens Valley Radio Observatory, Pasadena, CA), AB(Owens Valley Radio Observatory, Pasadena, CA), AC(Owens Valley Radio Observatory, Pasadena, CA), AD(Owens Valley Radio Observatory, Pasadena, CA), AE(Owens Valley Radio Observatory, Pasadena, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 566-587. Research supported by the James Irvine Foundation, IBM Corp., and California Institute of Technology. (ApJ Homepage)
Publication Date:
11/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ANISOTROPY, GALACTIC EVOLUTION, RELIC RADIATION, ANTENNA RADIATION PATTERNS, COMPUTATIONAL ASTROPHYSICS, ERROR ANALYSIS
DOI:
10.1086/168039
Bibliographic Code:
1989ApJ...346..566R

Abstract

After adjustment for observational parameters, various models predict an upper anisotropy limit of microwave background radiation of delta T/T less than 0.00017 at the 95 percent confidence level for uncorrelated patches of sky that are uniform on a 2-arcsec scale. This limit is more than a factor of 2 lower than previous limits on comparable angular scales. Results obtained assuming Gaussian fluctuations place useful constraints on models of galaxy formation based on adiabatic or isocurvature fluctuations in baryonic matter, provided that any reionization of the intergalactic medium occurred at z less than 40. Adiabatic models are ruled out with greater than 95 percent confidence, and isocurvature models with Omega less than 0.8 are inconsistent with the measured limits. Nonbaryonic models with early reionization predict anisotropy levels up to a factor of 3 below the present limit. The lowest predictions come from models with biased galaxy formation, nonbaryonic matter, and early reionization and are as much as a factor of 10 below the present sensitivity limit. The predictions of most popular contending theories of galaxy formation are within reach of the techniques used in this study.

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