OH radiation from the interstellar cloud medium

Details OH radiation from the interstellar cloud medium OH radiation from the interstellar cloud medium

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....46..413n&link_type=abstract

Astronomy and Astrophysics, vol. 46, no. 3, Feb. 1976, p. 413-428. Research supported by the Max-Planck Gesellschaft, Max-Planc

Astronomy and Astrophysics

Astronomy

36

Hydrogen Clouds, Hydroxyl Emission, Interstellar Masers, Microwave Emission, Radio Sources (Astronomy), Extragalactic Radio Sources, Formaldehyde, Galactic Radio Waves, Interstellar Gas, Optical Pumping, Radio Spectra

Scientific paper

This paper reports observations at 1612, 1665, 1667, and 1720 MHz of OH radiation in H I clouds in the direction of 22 strong galactic and extragalactic radio sources, OH emission and absorption in the neighborhood of 21-cm continuum sources, and strong OH absorption features in the 6-cm formaldehyde line. Absorption at 1667 MHz was observed in the direction of nine of the 22 strong sources. Fine structures in the spectra of the sources 3C 123 and 3C 353 are discussed along with general properties of the 1667-MHz absorption, and the data for that line are compared with those for H I absorption. Since the OH and H I radial velocities are found to agree to within 1 km/s, it is suggested that both OH and H I gas exist in the same interstellar clouds. For the clouds in the direction of several sources, calculations are made of the OH excitation temperatures, optical depths, and column densities. A pumping mechanism for the OH radiation is proposed which involves far-IR radiation and collisions with neutral as well as charged particles.

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