Hydrogen line spectrum in quasars. II - A critical discussion of model calculations for the broad line region

Details Hydrogen line spectrum in quasars. II - A critical discussion of model calculations for the broad line region Hydrogen line spectrum in quasars. II - A critical discussion of model calculations for the broad line region

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106..362c&link_type=abstract

Astronomy and Astrophysics, vol. 106, no. 2, Feb. 1982, p. 362-374.

Astronomy and Astrophysics

Astrophysics

66

Astronomical Models, H Alpha Line, H Beta Line, Quasars, Seyfert Galaxies, Spectral Line Width, Balmer Series, Collisional Plasmas, Helium Ions, Iron, Line Spectra, Magnesium, Paschen Series, Photoionization, Spectral Energy Distribution

Scientific paper

The most important, recent observations of hydrogen spectra in quasars and Seyfert galaxies are reviewed. By solving the line transfer with an exact numerical method, it is shown that the standard photoionized model produces H-alpha/H-beta line ratios which are too large. It is proposed that broad lines can be produced by a composite model comprising two physically distinct regions: (1) a standard photoionized region with an HII zone where the high excitation lines of HI (Lyman), CIII, HeI, HeII. . . are formed, and possibly a transition zone that contributes to the Balmer, Paschen, MgII and FeII line fluxes, and (2) a hot dense ionized medium which is collisionally heated. Some observations are suggested that could be made to test this composite model.

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