Titlebook: Observational Cosmology; Proceedings of the 1 Adelaide Hewitt,Geoffrey Burbidge,Li Zhi Fang Conference proceedings 1987 International Astro

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978-90-277-2476-2International Astronomical Union 1987

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Measurement of the Microwave Background Temperature from CN AbsorptionObservations of the interstellar lines of CN near 3875Å toward ζ Oph provide precise measurements of the Microwave Background Radiation (MBR) temperature and determine the intrinsic linewidth necessary for the saturation correction. We report T. =2.74±0.05 K at λ=2.64 mm and T. =2.75 (+0.24, -0.29) K at λ=1.32 mm..