Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lastr..99..513r&link_type=abstract
L'Astronomie (ISSN 0004-6302), vol. 99, Nov. 1985, p. 513-522. In French.
Astronomy and Astrophysics
Astronomy
Millimeter Waves, Radio Astronomy, Carbon Monoxide, Galaxies, Interstellar Masers, Interstellar Matter, Milky Way Galaxy, Quasars, Solar System
Scientific paper
Millimeter radioastronomy has allowed the identification of numerous molecules in interstellar regions, the location of pulsars, and the chemical processes occurring in other galaxies, stars, planets and comets. The interstellar medium is at temperatures from 10-100 K and features molecular densities of 10-1,000,000 molecules/cu cm. The densities of interstellar clouds, 100,000 molecules/cu cm, is about the same as the best laboratory vacuums which can be achieved on earth, which makes the millimeter wavelength measurements of interstellar chemistry capable of recording phenomena that are impossible to duplicate. The searches for molecules are carried out either by tuning to a known frequency or by performing broadband scans to develop a database of spectral signatures. The latter technique occasionally leads to the discovery of new molecules. Other applications of millimeter for studying interstellar masers, the features of galaxies and quasars and the fine structures of the planetary bodies and interplanetary space in the solar system are discussed.
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