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Cross-correlation between the 170 GHz survey map and the COBE differential microwave radiometer first-year mapsThis letter describes results of a cross-correlation between the 170 GHz partial-sky survey, made with a 3.8 deg beam balloon-borne instrument, and the COBE DMR 'Fit Technique' reduced galaxy all-sky map with a beam of 7 deg. The strong correlation between the data sets implies that the observed structure is consistent with thermal variations in a 2.7 K emitter. A chi-square analysis applied to the correlation function rules out the assumption that there is no structure in either of the two maps. A second test shows that if the DMR map has structure but the 170 GHz map does not, the probability of obtaining the observed correlation is small. Further analyses support the assumption that both maps have structure and that the 170 GHz-DMR cross-correlation is consistent with the analogous DMR correlation function. Maps containing various combinations of noise and Harrison-Zel'dovich power spectra are simulated and correlated to reinforce the result. The correlation provides compelling evidence that both instruments have observed fluctuations consistent with anisotropies in the cosmic microwave background.
Document ID
19930057659
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ganga, Ken
(Princeton Univ. NJ, United States)
Cheng, ED
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Meyer, Stephan
(MIT Cambridge, MA, United States)
Page, Lyman
(Princeton Univ. NJ, United States)
Date Acquired
August 16, 2013
Publication Date
June 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 410
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A41656
Funding Number(s)
CONTRACT_GRANT: NAGW-1841
Distribution Limits
Public
Copyright
Other

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