Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..151w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 151-156.
Astronomy and Astrophysics
Astronomy
21
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.
Baudry Alain
Guilloteau Stéphane
Walmsley Charles Malcolm
Winnberg Anders
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