Electron density and carriers of the diffuse interstellar bands

Details Electron density and carriers of the diffuse interstellar bands Electron density and carriers of the diffuse interstellar bands

2007-01-02

arxiv.org/abs/astro-ph/0701037v2

Astron.Astrophys.469:201,2007

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1051/0004-6361:20077077

We have used the ionisation equilibrium equation to derive the electron density in interstellar clouds in the direction to 13 stars. A linear relation was found, that allows the determination of the electron density from the Mg I and Mg II column densities in diffuse clouds. The comparison of normalised equivalent width of 12 DIBs with the electron density shows that the DIBs equivalent width do not change with electron density varying in the range ne=0.01-2.5 cm^-3. Therefore the DIBs carriers (1) can be observed only in one ionisation stage, or (2) the DIBs are arising in cloud regions (eg. cores or cloud coronas) for which we can not determine the electron density.

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