Cyanogen excitation in diffuse interstellar clouds

Details Cyanogen excitation in diffuse interstellar clouds Cyanogen excitation in diffuse interstellar clouds

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..129r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 1, p. 129-143

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Background Radiation, Cyanogen, Excitation, Gas Temperature, Interstellar Matter, Line Spectra, Vibrational Spectra, Absorption Spectroscopy, Cosmic Background Explorer Satellite, Optical Measuring Instruments, Signal To Noise Ratios

Scientific paper

We present high signal-to-noise ratio observations of optical CN absorption from the B (2)sigma(+) -X (2)sigma(+) (0, 0) and (1, 0) vibrational bands in the five diffuse lines of sight toward zeta Ophiuchi, zeta Persei, HD 27778, HD 21483, and HD 154368. The observed level of CN excitation is consistent with direct satellite and rocket measurements of the cosmic microwave background radiation (CMBR), implying that local collision effects are small. The weak 2.64 mm CN line emission observed toward HD 21483 and HD 154368 is used to correct the observed CN excitation temperatures and derive a weighted mean CMBR temperature at 2.64 mm of 2.729(+0.023, -0.031) K which agrees remarkably well with the Cosmic Background Explorer Satellite (COBE) measurement obtained with the Far Infrared Absolute Spectrometer (FIRAS) instrument of 2.726 +/- 0.010 K. These absorption data were obtained during 10 separate observing runs, and we find excellent agreement between independent equivalent width measurements resulting from widely varying instrument combinations. Finally we discuss the limitations and future applications of CN excitation absorption-line measurements.

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