An upper limit on the microwave background temperature at Z = 1.776

Details An upper limit on the microwave background temperature at Z = 1.776 An upper limit on the microwave background temperature at Z = 1.776

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308l..37m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. L37-L41. Research supported

Other

41

Background Radiation, Cosmic Rays, Microwaves, Quasars, Temperature Distribution, Absorption Spectra, Astronomical Spectroscopy, Big Bang Cosmology, Brightness Temperature, Line Spectra, Red Shift

Scientific paper

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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