Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..370m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Feb. 1, 1990, p. 370-378.
Astronomy and Astrophysics
Astronomy
26
Active Galactic Nuclei, Astronomical Spectroscopy, Principal Components Analysis, Seyfert Galaxies, Ultraviolet Spectra, Iue, Light Curve, Spectrum Analysis, Variability
Scientific paper
In an attempt at a decomposition of the different sources of variation in the IUE spectra of NGC 4151, a principal component analysis of the spectra is conducted, seeking the number and form of the significant linearly independent spectra that are needed to reconstruct the data within the errors. Methods are outlined with particular emphasis on the effect of noise. Simulations are presented which aid interpretation of the results. The independent existence of about ten variable components identified previously using physical intuition is verified. No simple physical interpretation can be made for most of the linearly independent components, suggesting that principal component analysis has a fairly limited application to the analysis of spectroscopic variability of AGNs.
Mittaz Jon P. D.
Penston Michael V.
Snijders A. J. M.
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