Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..275m&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 3, Oct. 1979, p. 275-286.
Astronomy and Astrophysics
Astrophysics
35
Hydroxyl Emission, Interstellar Chemistry, Nebulae, Radio Telescopes, Astronomical Maps, Excitation, Formaldehyde, Hydroxyl Radicals, Optical Density, Rotating Matter, Thermodynamic Equilibrium, Velocity Distribution
Scientific paper
The paper considers the 18 cm emission lines observed in the dark nebula L 134 with the Effelsberg 100-m telescope. The cloud was mapped in the 1667 MHz line, and the distributions of the peak antenna temperature and area of the line follow the dust distribution in L 134. Assuming LTE for the main lines, the excitation temperature and optical depth at the cloud center, and the column density were determined. The satellite line intensities at the cloud center appear to be incompatible with LTE for the main lines, and the velocity field for OH is very similar to the velocity field for HI and H2CO indicating that the cloud is rotating. The linewidth of OH was determined over the cloud area, showing that it increases abruptly in the SE part of the cloud. The OH and H2CO antenna temperature distribution, and the OH and CO-13 column densities in L 134 were compared, indicating a good correlation.
Grasshoff Matthias
Mattila Kalevi
Winnberg Anders
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