A comparative study of the stellar content in normal and active nuclei of spiral galaxies |
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| Authors: | Horácio A Dottori Miriani G Pastoriza |
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| Institution: | (1) Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil |
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| Abstract: | We present spectrophotometry andUBV photometry of the central region of spiral galaxies. The sample consists of the Seyfert galaxies NGC 1566, 3783 and IC 4329A; NGC 1097, 2997, and 5236 containing peculiar nucleus and NGC 5530, 5643, and 6699 with normal nucleus.The stellar composition of the nuclei was derived by treating the equivalent widths of a sample of absorption lines with the method of constrained nonlinear optimization. The observed continua and theUBV colours were compared with the theoretical results in order to obtain the internal reddening and the contribution of the hot gas or non-thermal radiation. The age of the last cycle of star formation, the internal absorption and the theoretical relations M/L and H/K Caii present differences among the three types of nuclei. |
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