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The amplitude and spectral index of the large angular scale anisotropy in the cosmic microwave background radiationIn many cosmological models, the large angular scale anisotropy in the cosmic microwave background is parameterized by a spectral index, n, and a quadrupolar amplitude, Q. For a Harrison-Peebles-Zel'dovich spectrum, n = 1. Using data from the Far Infrared Survey (FIRS) and a new statistical measure, a contour plot of the likelihood for cosmological models for which -1 less than n less than 3 and 0 equal to or less than Q equal to or less than 50 micro K is obtained. Depending upon the details of the analysis, the maximum likelihood occurs at n between 0.8 and 1.4 and Q between 18 and 21 micro K. Regardless of Q, the likelihood is always less than half its maximum for n less than -0.4 and for n greater than 2.2, as it is for Q less than 8 micro K and Q greater than 44 micro K.
Document ID
19950038185
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ganga, Ken (Princeton Univ. Princeton, NJ, United States)
Page, Lyman (Princeton Univ. Princeton, NJ, United States)
Cheng, Edward (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Meyer, Stephan (Chicago Univ. Chicago, IL, United States)
Date Acquired
August 16, 2013
Publication Date
September 1, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 432
Issue: 1
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-1841
CONTRACT_GRANT: NAG5-2412
CONTRACT_GRANT: NSF PHY-89-21378
Distribution Limits
Public
Copyright
Other