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Interpretation of observed cosmic microwave background radiationThe Alfven and Mendis (1977) conclusion that dust grains in galaxies render the universe opaque to cosmic microwave background at a red shift ratio equal to 40 is challenged by a calculation of the opacity of galactic dust grains to the microwave background radiation from the time of decoupling at emission red shift ratio equal to 1500 to the present in the standard big bang model. In the present calculation, evolutionary effects on grain opacity and abundance are estimated. At wavelengths used in studying the microwave background, the optical depth of the grains is found to be 0.18 when the deceleration parameter equals 0.03, and 0.05 when the deceleration parameter equals 0.5. The results indicate that microwave background can provide information on an early dense phase of the universe.
Document ID
19780039674
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Pollaine, S.
(California, University Berkeley, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
February 2, 1978
Publication Information
Publication: Nature
Volume: 271
Subject Category
Space Radiation
Accession Number
78A23583
Distribution Limits
Public
Copyright
Other

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