Submillimeter observations of OH and CH in M 42.
Abstract
The authors have detected the 2Π1/2 J = 3/2→1/2 transitions of OH at 163.12 and 163.40 μm and obtained upper limits for the 2Π3/2 J = 3/2→1/2 transitions of CH at 149.09 and 149.39 μm, in observations of the Kleinmann-Low nebula of Orion. All four flux levels lie between 1 and 1.2×10-17W cm-3. Taken together with existing data on molecular hydrogen and CO and recent data on other OH transitions, the results suggest OH emission from postshock regions at temperatures T ≈ 103K and densities nH2 ≈ 7×106cm-3 and nOH ≈ 80 cm-3. The OH column density is NOH ≈ 4×1016cm-2 in the emitting regions.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1985
- DOI:
- 10.1086/163427
- Bibcode:
- 1985ApJ...296..142V
- Keywords:
-
- Hydrocarbons;
- Hydroxyl Emission;
- Interstellar Gas;
- Line Spectra;
- Orion Nebula;
- Carbon Monoxide;
- Self Absorption;
- Submillimeter Waves;
- Thermal Emission;
- Astrophysics