Vabrationally Excited Silicon Monoxide in the Orion Nebula
Abstract
A 1 K line has been detected in the center of the molecular cloud in the Orion Nebula which is probably the 129,363.1-MHz, j = 3 2 rotational transition of SiO in its first excited (v = 1) vibrational state. The LSR radial velocity based on this assigument is 15.3 km s ', which is exactly that of the second strongest of the seven lines at 86.2 GHz recently found by Snyder and Buhl, and attributed by them to maser emission by the v = 1, j = 2 1 transition of SiO. We have been unable to detect vibrationally excited SiO in any other source at 129 GHz, and a search for the v = 1, J = I H 0 line of CO has also proved unsuccessful. Subject headings: Orion Nebula - radio lines
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1974
- DOI:
- 10.1086/181520
- Bibcode:
- 1974ApJ...190L.117D