Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..101r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 101-104.
Astronomy and Astrophysics
Astrophysics
5
Active Galactic Nuclei, Cross Correlation, Light Curve, Seyfert Galaxies, Statistical Correlation, Emission Spectra, Iue, Radiant Flux Density
Scientific paper
Over the past few years, cross-correlation techniques have become of increasing importance in the context of active galactic nuclei (AGN) variability studies. Here, the capabilities of the two techniques most commonly used, namely the Discrete Correlation Function (Edelson and Krolik, 1988) and the more familiar Cross-Correlation Function e.g., Gaskell and Peterson (1986), are reviewed. Both techniques are applied to the well sampled ultraviolet continuum light-curve of the Seyfert galaxy NGC 5548, and the results are compared. It is concluded that the CCF and the DCF yield essentially the same results, and that the limiting factor is the frequency and the regularity of the observations rather than the details of the technique being used to infer time delays.
Clavel Jean
Rodriguez-Pascual Pedro M.
Santos-Lleo Maria
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