Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..264m&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 3, Oct. 1979, p. 264-274.
Astronomy and Astrophysics
Astrophysics
19
Hydrogen Clouds, Hydroxyl Emission, Interstellar Chemistry, Nebulae, Dust, Neutral Gases, Optical Density, Radial Velocity, Radio Telescopes, Thermodynamic Equilibrium
Scientific paper
The H I observations of the dark nebula L 1780 which reveal the existence of an excess of 21-cm emission at one edge of the cloud are presented. The high galactic latitude dark nebula L 1780 was observed in the 21-cm H I line and the 18-cm OH lines with the Effelsberg 100-m telescope. An excess emission over the whole southern half of the dust cloud was detected, and the progress of its intensity agreed with the theory of Hollenbach (1971) for H2 formation in dust clouds. The 1667 and 1665 MHz OH lines were detected in the center of L 1780 with relative intensities corresponding to LTE and low optical depth, and the OH column density was determined. A comparison of the 21-cm excess emission line with the molecular lines of OH, CH, H2CO, and CO shows agreement in radial velocity, concluding that H I and the molecules are spatially connected with each other and the dust cloud.
Mattila Kalevi
Sandell Goeran
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