Physics – Optics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991an....312..167r&link_type=abstract
Astronomische Nachrichten (ISSN 0004-6337), vol. 312, no. 3, 1991, p. 167-176.
Physics
Optics
3
Astronomical Spectroscopy, Balmer Series, Seyfert Galaxies, Spectral Line Width, Cassegrain Optics, Emission Spectra, Luminous Intensity
Scientific paper
Medium-resolution spectrophotometry of 19 Seyfert-I galaxies with M(v) between -20m and -24m is presented. Balmer line broad and narrow components are decomposed and relative narrow-line intensities are compared with a grid of power law photoionization models. Diagrams displaying ratios of strong forbidden lines are devised which allow to read power law indices alpha and ionization parameters U for individual objects. On the average, alpha-values derived from forbidden O I/forbidden O III versus forbidden N II/forbidden O III are in good agreement with power-law slope indices derived from continuum measurements at 1450 A (U) and 0.7 keV (X). However, for the same parameters, the theoretical forbidden S II/forbidden O III values appear to be 40 percent too large. It is suggested that this discrepancy might be removed by including a black-body component in the ionizing continuum and a high-density component in the narrow-line region.
Rafanelli Piero
Schulz Holger
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