Broad forbidden NE III line emission and intermediate-density gas around QSO nuclei

Details Broad forbidden NE III line emission and intermediate-density gas around QSO nuclei Broad forbidden NE III line emission and intermediate-density gas around QSO nuclei

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..497z&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, May 1990, p. 497-502.

Astronomy and Astrophysics

Astronomy

3

Active Galactic Nuclei, Forbidden Transitions, Interstellar Gas, Neon, Quasars, Spectral Emission, Spectral Line Width, Flux Density, Gas Density, Image Dissector Tubes, Radiation Pressure

Scientific paper

A broad emission feature, with a velocity width of the order of 5000 km/s, has been observed near rest wavelength 3870 A in the spectra of three low-redshift QSOs. The line is identified as forbidden Ne III 3869. This broad line may have varied over a time scale of two years, indicating that clouds of intermediate density between 10 to the 8th and 10 to the 11th/cu cm may coexist in the broad-line region. Such clouds would be optically thin, highly ionized, and subject to rapid destruction by radiation pressure.

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