Complete sample of soft X-ray-selected AGNs. I. The data

We present the optical spectra and simple statistical analysis for a complete sample of 110 soft X-ray-selected AGNs. About half of the sources are narrow-line Seyfert 1 galaxies (NLS1's), which have the steepest X-ray spectra, the strongest Fe II emission, and slightly weaker [O III] lambda5007 emission than broad-line Seyfert 1's (BLS1's). Kolmogorov-Smirnov tests show that NLS1's and BLS1's have clearly different distributions of the X-ray spectral slope alpha(X), X-ray short-term variability, and Fe II equivalent widths and luminosity and Fe II/Hbeta ratios. The differences in the [O III]/Hbeta and [O III] equivalent widths are only marginal. We found no significant differences between NLS1's and BLS1's in their rest-frame 0.2-2.0 X-ray luminosities, rest-frame 5100 monochromatic luminosities, bolometric luminosities, redshifts, and their Hbeta equivalent widths.