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Title:
An upper limit on the microwave background temperature at Z = 1.776
Authors:
Meyer, D. M.; York, D. G.; Black, J. H.; Chaffee, F. H., Jr.; Foltz, C. B.
Affiliation:
AA(Chicago, University, IL), AB(Chicago, University, IL), AC(Steward Observatory, Tucson, AZ), AD(Multiple Mirror Telescope Observatory, Tucson, AZ), AE(Multiple Mirror Telescope Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. L37-L41. Research supported by the University of Chicago. (ApJ Homepage)
Publication Date:
09/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BACKGROUND RADIATION, COSMIC RAYS, MICROWAVES, QUASARS, TEMPERATURE DISTRIBUTION, ABSORPTION SPECTRA, ASTRONOMICAL SPECTROSCOPY, BIG BANG COSMOLOGY, BRIGHTNESS TEMPERATURE, LINE SPECTRA, RED SHIFT
DOI:
10.1086/184739
Bibliographic Code:
1986ApJ...308L..37M

Abstract

The authors present observations of C I lines in the z = 1.776 absorption-line system toward the QSO 1331+170 which indicate a 2σ upper limit of 0.67 on the N(3P1)/N(3P0) fine-structure population ratio. Even in the presence of other excitation mechanisms in C0, this value provides an upper limit of 16K on the cosmic microwave background (CMB) temperature at 0.61 mm at z = 1.776. Based on the present-day 2.7K blackbody spectrum for the CMB, the CMB temperature at z = 1.776 should be 7.5K according to the standard Big Bang model prediction.

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