The correlation between colour and line intensities in type-1 Seyfert galaxies

Details The correlation between colour and line intensities in type-1 Seyfert galaxies The correlation between colour and line intensities in type-1 Seyfert galaxies

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982iraj...15..281z&link_type=abstract

Irish Astronomical Journal (ISSN 0021-1052), vol. 15, Sept. 1982, p. 281-287.

Astronomy and Astrophysics

Astronomy

Astronomical Spectroscopy, Galactic Radiation, Seyfert Galaxies, Spectral Correlation, Spectral Line Width, Galactic Nuclei, H Beta Line, Line Spectra, Luminosity, Oxygen Spectra

Scientific paper

Published observations of overlapping 19-35-member sets of type -I Seyfert galaxies in H-beta and Q III (5007 A) are analyzed statistically in terms of correlations between line luminosity (J), equivalent width (W), and color indices. A 'generalized color difference' is defined by the expression Q(a) = (U-B)-a(B-V), and it is found that J correlates best with Q(a) when a = about 0.5. It is inferred that Q(0.5) is a better indicator of the radiation strength beyond the Lyman limit in the nucleus than (U-B). J is shown to give better correlations to Q(a) than W, but with lager rms dispersion about the regression line. A strong positive correlaton between J and K, the continuum luminosity, is demonstrated for H-beta.

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