Principal component analysis of two ultraviolet emission - lines in 18 active galactic nuclei


We apply a principal component analysis (PCA) to the spectra of each of the 18 Seyfert 1-like objects observed more than 15 times by the international ultraviolet explorer (IUE) from 1978 until the end of 1991. PCA allows us to decompose the Ly and C iv 1549 emission-lines of each object into two components with uncorrelated variations. We nd that the… (More)


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