Spectrophotometry of Seyfert 1 galaxies

Relative emission-line intensities measured from image-tube/image-dissector spectral scans performed with a resolution of approximately 10 A are presented for 36 Seyfert 1 galaxies. The emission-line intensities are linked to the continuum by measuring the equivalent width of H-beta, the relative intensities for the Seyfert 1 galaxies are compared with those for five broad-line radio galaxies, and each Seyfert is classified into one of four groups on the basis of the appearance of its H-beta profile. It is shown that the broad-line radio galaxies generally have larger H-alpha/H-beta ratios and steeper Balmer gradients than the Seyferts, that the He I 5876-A and He II 4686-A lines in the Seyferts have widths comparable to those of the H I lines, and that the He abundances are approximately normal in most Seyfert 1 and broad-line radio galaxies. Nearly every Seyfert is found to have measurable Fe II emission, but a wide intensity range is observed.