Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Carbon Monosulfide

  • William M. Irvine
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_1804-4




The diatomic molecule carbon monosulfide, CS, is widespread in interstellar and circumstellar molecular clouds, in our Milky Way and in external galaxies. Its emission at millimeter wavelengths is frequently used to estimate the density in these regions, since these pure rotational transitions require densities greater than about 105 molecules per cubic centimeter to be excited by collisions. Various isotopic variants have been observed astronomically, including those with 13C, 34S, and 33S, as well as the most abundant 12C32S. CS is also observed in cometary comae.


Interstellar CS was first detected by radio astronomers in 1971.

See Also


Bioorganic Chemistry Diatomic Molecule Molecular Cloud Rotational Transition Isotopic Variant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References and Further Reading

  1. Penzias AA, Solomon PM, Wilson RW, Jefferts KB (1971) Interstellar carbon monosulfide. Astrophys J 168:L53–L58CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Department of AstronomyUniversity of Massachusetts, Lederle Graduate Research Tower B 619EAmherstUSA