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Title:
A precise measurement of the cosmic microwave background radiation temperature from CN observations toward Zeta Persei
Authors:
Kaiser, Mary Elizabeth; Wright, Edward L.
Affiliation:
AA(California, University, Los Angeles), AB(California, University, Los Angeles)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 356, June 10, 1990, p. L1-L4. (ApJ Homepage)
Publication Date:
06/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BIG BANG COSMOLOGY, CYANO COMPOUNDS, INTERSTELLAR GAS, RELIC RADIATION, SIGNAL TO NOISE RATIOS, BLACK BODY RADIATION, HIGH RESOLUTION, LIGHT (VISIBLE RADIATION), LINE OF SIGHT
DOI:
10.1086/185737
Bibliographic Code:
1990ApJ...356L...1K

Abstract

High-SNR high-resolution (R = 150,000-170,000) optical spectra of interstellar CN toward Zeta Per are presented. Fits to the data yield a value of 1.25 + or - 0.02 km/s for the R(O) linewidth parameter b along this line of sight. The column densities of the level populations are directly determined from the convolution of the instrument response function with a model which is then fitted to the data. Tex = 2.79 + or - 0.03 K is obtained along this line of sight.

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