Detailed observations of NGC 4151 with IUE - III. Variability of the strong emission lines from 1978 February to 1980 May

Abstract

Observations of the variability of the three strong ultraviolet emission lines in the Seyfert galaxy NGC 4151 (C IV, C III] and Mg II) are used to study the structure of the broad line region and the nuclear energy source of this active galaxy.