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Spectropolarimetry and variability of Seyfert 1.8 and 1.9 galaxies
The phenomenon which produces the spectra classified as Seyfert 1.8 or1.9 is investigated through CCD spectropolarimetry and through analysisof three highly variable objects. The Seyfert 1.9 galaxy IRAS 1958-183has a highly polarized continuum and a broad H-alpha line which is 30percent polarized. The variability of NGC 2622, NGC 7603 (= Mrk 530),and Mrk 1018 are studied. The changes in flux of the broad lines and thecontinuum near H-alpha and H-beta are consistent with changes in theextinction in all cases. Improved IRAS photometry supports theconclusion that most Seyfert 1.8s and 1.9s are normal Seyfert 1s seenthrough a screen of dust located in or just outside of the broad-lineregions. Variability is due to changes in the optical depth of thisscreen.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Yilan |
| Sað Açýklýk: | 15h58m00.78s |
| Yükselim: | +20°02'40.4" |
| Görünürdeki Parlaklýk: | 9.461 |
| özdevim Sað Açýklýk: | 12.5 |
| özdevim Yükselim: | 6.7 |
| B-T magnitude: | 9.674 |
| V-T magnitude: | 9.479 |
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