Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201...26b&link_type=abstract
Astrophysical Journal, vol. 201, Oct. 1, 1975, pt. 1, p. 26-44.
Astronomy and Astrophysics
Astrophysics
235
Astronomical Photometry, Emission Spectra, Quasars, Red Shift, Astronomical Spectroscopy, Balmer Series, Cosmology, Helium Atoms, Line Spectra, Photoionization, Recombination Reactions, Shock Waves
Scientific paper
Emission-line strengths, low-resolution line profiles, and continuum energy distributions were measured for 14 low-redshift QSOs. The profiles of many of the broad emission lines are quite symmetrical and in excellent agreement either with electron-scattering profiles or with the profiles expected for mass loss driven by radiation pressure, but some of these QSOs have asymmetrical broad lines which necessarily involve mass motions at high velocities. The Balmer decrements are considerably steeper than is predicted by recombination theory, implying that there is either reddening or at least some collisional excitation. Helium is found to have a normal abundance in these QSOs. The narrow O III and Ne III forbidden-line strengths are consistent with heating by photoionizations, but the strengths of the O II forbidden line at 3727 A are much stronger than can be easily explained by existing models.
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