Observations of highly excited OH towards galactic H II regions

Astronomy and Astrophysics – Astronomy

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H Ii Regions, Hydroxyl Emission, Infrared Astronomy, Interstellar Masers, Milky Way Galaxy, Radio Astronomy, Line Spectra, Molecular Gases, Orion Nebula

Scientific paper

The authors have observed the 2Π3/2, J = 9/2 Λ-doubling lines of OH towards seven galactic sources. Both the F = 4→4 and 5→5 transitions have been detected in absorption towards W3(OH), G 10.6-0.4, G 45.13+0.14, and K3-50. The F = 5→5 transition was seen towards DR21. These data confirm the presence of hot clumps containing OH in the neighbourhood of many compact H II regions and show that inversion or maser action in the J = 9/2 level is unusual. The estimated rotation temperatures along the 2Π3/2 ladder vary in the range 70 - 550K. The authors compare the OH and infrared characteristics of these compact H II regions and discuss the interpretation of recent far infrared and radio observations of OH towards the Orion-KL region.

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