Absorption against the cosmic 2.7 K background: A technique for detection of asymmetric top molecules in cosmic objects
Abstract
Observation of an interstellar line in absorptionagainst the cosmic 2.7 K background is an unusual phenomenon. Up to now, onlytwo lines have been reported in absorption against the cosmic 2.7 Kbackground: (i) the 110 - 111 transition of formaldehyde, and (ii) the 220 - 211 transition of cyclopropenylidene. In the present investigation, we discuss about the conditions under which the transitions 220 - 211 and 220 - 221 in asymmetric topmolecules may be observed in absorption, even against the cosmic 2.7 K background. Observing these lines in absorption may be used as a technique for detection of some asymmetric top molecules in cosmic objects.
- Publication:
-
IAU Joint Discussion
- Pub Date:
- 2000
- Bibcode:
- 2000IAUJD...1E..63C