Molecules among the stars

Details Molecules among the stars Molecules among the stars

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976newsc..69..170p&link_type=abstract

New Scientist, vol. 69, Jan. 22, 1976, p. 170-173.

Astronomy and Astrophysics

Astronomy

1

Galactic Structure, Interstellar Gas, Molecular Physics, Radio Astronomy, Astronomical Maps, Carbon Monoxide, Cosmic Dust, Dark Matter, Electron Transitions, Hydrocyanic Acid, Hydrogen, Interstellar Matter, Line Spectra, Milky Way Galaxy, Millimeter Waves, Nebulae

Scientific paper

The article discusses the importance of simple molecules abundant in interstellar space, specifically H2, CO, CS, and HCN, as tools for probing the cool dark matter and the velocity and structure of gas clouds. CO molecules, while less abundant than H2 molecules, possess a dipole moment and remain hotter than the cosmic background blackbody radiation. The information obtained from vibrational transitions of these molecules is not affected by daytime brightness nor by accumulation of material on the line of sight or obscuration by dust clouds. Advantages of the simpler excitation mechanisms for the simpler molecules are also stressed. A list of interstellar molecules discovered to date is presented.

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