Statistics – Computation
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333..646e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. 646-659.
Statistics
Computation
521
Active Galactic Nuclei, Quasars, Radio Sources (Astronomy), Seyfert Galaxies, Stellar Luminosity, Ultraviolet Radiation, Computational Astrophysics, Cross Correlation, Emission Spectra, Line Spectra
Scientific paper
A method of measuring correlation functions without interpolating in the temporal domain, "the discrete correlation function," is introduced. It provides an assumption-free representation of the correlation measured in the data and allows meaningful error estimates. This method avoids the problem of spurious correlations at zero lag due to correlated errors. The method is applied to the case of AGN line-continuum cross-correlation functions by using published data for Akn 120 and NGC 4151. No correlation was found for the optical data for Akn 120, but the ultraviolet NGC 4151 data show a strong correlation, indicating that the broad C IV feature emanates from a region whose size is greater than 1.2 and less than 20 light-days.
Edelson Richard A.
Krolik Julian H.
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