| タイトル | The ultraviolet excess of Seyfert 1 galaxies and quasars |
| 著者（英） | Malkan, M. A.; Sargent, W. L. W. |
| 著者所属（英） | California Inst. of Tech. |
| 発行日 | 1982-03-01 |
| 言語 | eng |
| 内容記述 | A sharp rise from 4000 to 3650 A in the excess flux was obtained when a power-law determined in the red and infrared was subtracted from IR-optical-UV composite spectra of eight Seyfert 1 galaxies and quasars to measure UV excess. The excess is produced by Balmer continuum emission which, relative to H-alpha, is greater than the prediction of Case B recombination by a factor of 1.5-2.5. An additional component from 5000 A to the far-UV was found when the spectra were fitted with combinations of power-law and hydrogen recombination continua. The component is well described by a blackbody at a single temperature ranging from 20,000 to 30,000 K. All of the observed spectra were producible with combinations of power-law, recombination and blackbody emission, and all of the objects in the sample were found to have a power-law component with a slope of -1.1 + or - 0.1. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 82A27337 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/411302 |
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