Electron and local gas densities in diffuse interstellar clouds from measurements of CA I absorption

Details Electron and local gas densities in diffuse interstellar clouds from measurements of CA I absorption Electron and local gas densities in diffuse interstellar clouds from measurements of CA I absorption

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..813f&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 813-816. Research supported by the Robert A. Welch Foundation;

Astronomy and Astrophysics

Astrophysics

20

Calcium, Electron Density (Concentration), Interstellar Gas, Interstellar Radiation, Molecular Clouds, Absorption Spectra, Gas Density

Scientific paper

Electron and local gas densities in 12 diffuse interstellar clouds have been determined from absorption measurements of Ca I λ4226 and Ca II λ3934 and an assumed fractional ionization χɛ = 3 × l0-4. Individual velocity components have been analyzed separately. The values for the electron density range from 0.055 to 0.57 cm-3, while the local gas densities are between 180 and 1900 cm-3. The large values for the electron and local gas densities toward ι, ζ, and perhaps 23 Ori, where few hydrogen molecules occur, may arise from recently compressed gas behind a shock.

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