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Small-scale microwave background anisotropies implied by large-scale dataIn the absence of reheating microwave background radiation (MBR) anisotropies on arcminute scales depend uniquely on the amplitude and the coherence length of the primordial density fluctuations (PDFs). These can be determined from the recent data on galaxy correlations, xi(r), on linear scales (APM survey). We develop here expressions for the MBR angular correlation function, C(theta), on arcminute scales in terms of the power spectrum of PDFs and demonstrate their accuracy by comparing with detailed calculations of MBR anisotropies. We then show how to evaluate C(theta) directly in terms of the observed xi(r) and show that the APM data give information on the amplitude, C(O), and the coherence angle of MBR anisotropies on small scales.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Kashlinsky, A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 402
Issue: 2
ISSN: 0004-637X
Subject Category
Distribution Limits