AAS 198th Meeting, June 2001
Session 72. Seyfert Galaxies
Display, Thursday, June 7, 2001, 9:20am-4:00pm, Exhibit Hall

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[72.10] A CCD Color Comparison of Seyfert 1 and 2 Host Galaxies

S.N. Virani (Harvard-Smithsonian CfA), M.M. De Robertis (York U.)

Wide-field, R-band CCD data of 15 Seyfert 1 and 15 Seyfert 2 galaxies taken from the CfA survey were analysed in order to compare the properties of their host galaxies. Also, B-band images for a subset of 12 Seyfert 1s and 7 Seyfert 2s were acquired and analysed in the same way.

The nuclear contribution of the Seyfert host galaxies was modeled and removed empirically by using a robust technique for decomposing the nucleus, bulge and disk components (see Virani et al. 2000, De Robertis and Virani, 2001). Profile fits to the remaining bulge+disk light were then performed.

Of the many B-R color comparisons that were performed (i.e., component colors, color gradient, etc.) between Seyfert 1s and 2s, only two distributions differed at greater than the 95% confidence level for the K-S test: the magnitude of the nuclear component, and the radial color gradient outside the nucleus. The former is expected. The latter could be consistent with some proposed evolutionary models. There is some suggestion that other parameters may differ, but at a lower confidence level. Color contour maps and results from all tests performed (K-S test and Wilcoxon-Rank Sum Test) are presented.

The author(s) of this abstract have provided an email address for comments about the abstract: svirani@cfa.harvard.edu

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