Determination of Electron Density in Interstellar Clouds from N(Ca0)/N(Ca+)

Details Determination of Electron Density in Interstellar Clouds from N(Ca0)/N(Ca+) Determination of Electron Density in Interstellar Clouds from N(Ca0)/N(Ca+)

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973apl....15..185f&link_type=abstract

Astrophysical Letters, Vol. 15, p.185

Astronomy and Astrophysics

Astrophysics

Interstellar Matter, Electron Density Of Ism

Scientific paper

The percentage concentrations lambda of CaI and CaII are calculated as a function of optical depth within a uniformly dense cloud under the influence of an interstellar radiation field attenuated by exp^(-tau_lambda). The common assumption that the two ionization species are coexistent within the cloud is shown to be unjustified in general, since the radius at which n(CaII) falls to one-half of its central value is not the same as the radius at which n(CaI) falls to one-half of its central value. A standard method for determining interstellar electron densities must therefore be applied with discretion. It is also shown that the ratio N(CaI)/N(CaII), and therefore the deduced electron density, is relatively insensitive to the uncertain assumptions about the far-ultraviolet parameters.

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