Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..273w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 292, p. 273
Other
27
Seyfert Galaxies, Galactic Nuclei, Ubv Spectra, Astronomical Photometry, Brightness Distribution, Particle Flux Density, Linear Equations, Statistical Analysis, Luminosity, Error Analysis
Scientific paper
UBV(RI)C aperture photometry was carried out over a four-yr period for 92 broad-line Seyfert galaxies. Where possible, the observations were repeated at different epochs in order to try to detect brightness variations. Significant variations were found in the majority of the objects observed at more than one epoch. Plots of the flux measurements through different bands against each other closely resemble linear relationships. Error contours of the data points in these plots are shown to be covariant ellipses. A statistical method is developed that enables one to obtain the best linear fit taking into account the error geometry peculiar to these data. The nuclear colors are determined for 50 significantly variable objects by calculating the best straight-line fits according to this statistical method. Chi-squared tests are used to show that, contrary to claims made in some recent studies, there is no significant deviation of the data from the straight-line fit in the vast majority of cases. The relationship between galaxy inclination and nuclear extinction is found to be very poorly defined, showing that the extinction largely depends on the amount of dust in in the circumnuclear region rather than interstellar dust in the galaxy itself.
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