Calán-Tololo survey. IV. Seyfert 1 galaxies.

The fourth list of the Calan-Tololo Survey is presented. It contains information for 50 new type 1 Seyfert galaxies in the southern hemisphere. The objects were found searching objective prism plates from the Curtis-Schmidt telescope at Cerro Tololo Inter-American Observatory, using the thin UV prism and IIIaJ plates. The present list contains only confirmed Seyfert galaxies, drawn from a larger unpublished list of Seyfert galaxy candidates. The Seyfert nature of these objects was established through slit spectrophotometry performed at Las Campanas Observatory using the du Pont 2.5-m telescope and also at CT1O using the 4-m telescope; the spectrophotometry will be published elsewhere.