Absorption against the cosmic 2.7 K background

Details Absorption against the cosmic 2.7 K background Absorption against the cosmic 2.7 K background

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367..995c&link_type=abstract

Astronomy and Astrophysics, v.367, p.995-999 (2001)

Astronomy and Astrophysics

Astrophysics

2

Molecular Processes, Ism: Molecules, Cosmology: Cosmic Microwave Background, Radio Lines: Ism

Scientific paper

Two interstellar lines, 110-> 111 of formaldehyde at 4.831 GHz, and 220-> 211 of cyclopropenylidene at 21.590 GHz, have so far been observed in absorption against the cosmic 2.7 K background. Observation of an interstellar line in absorption against the cosmic 2.7 K background is an unusual phenomenon, and can only be possible under rather peculiar conditions developed in the molecule, generating the line. We predict that two more lines, 330-> 321 at 27.100 GHz, and 331-> 322 at 59.550 GHz of cyclopropenylidene, and three lines, 220-> 211 at 15.600 GHz, 330-> 321 at 23.100 GHz, and 331-> 322 at 39.700 GHz of ethylene oxide, may show absorption against the cosmic 2.7 K background. We speculate that such peculiar conditions are characteristic for b-type asymmetrical top molecules. - The observation of these lines may be used to place upper bounds to the density in the absorbing region.

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