A search for interstellar neutral sodium at 17 centimeter wavelength

Details A search for interstellar neutral sodium at 17 centimeter wavelength A search for interstellar neutral sodium at 17 centimeter wavelength

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..363t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 363-373.

Astronomy and Astrophysics

Astronomy

7

Abundance, Centimeter Waves, Cosmic Dust, Interstellar Matter, Neutral Atoms, Sodium, Atomic Spectra, Hydrogen, Hyperfine Structure, Molecular Clouds, Radio Astronomy

Scientific paper

The 17 cm hyperfine transition of neutral atomic sodium has been searched for unsuccessfully in a wide variety of atomic and molecular interstellar clouds. The results show that atomic sodium is indeed depleted in dense molecular clouds, as expected. Analysis of the chemical and ionization equilibrium shows that sodium cannot be hiding in the form Na II. It is argued that sodium-bearing molecules are also unimportant. Therefore, it is concluded that sodium resides in grains, from which it cannot be returned to the gas phase in any form.

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