Ionizing Continuum and Emission-Line Energetics of Quasars and Seyfert Galaxies
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2003
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| _version_ | 1876484570224787456 |
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| author | G. M. MacAlpine |
| author_facet | G. M. MacAlpine |
| contents | Ionizing Continuum and Emission-Line Energetics of Quasars and Seyfert Galaxies G. M. MacAlpine Física, Astronomía y Matemáticas Quasars: General Galaxies: Seyfert Ultraviolet: Galaxies Quasars: Emission Lines There has been renewed interest in apparently discrepant energy budgets suggested by consideration of the observed ionizing continua in combination with certain broad emission-line measurements for active galactic nuclei. This discussion reviews the history for the worrisome dilemma, and the evolving situation is reexamined in light of the most recent observations along with improvements in our understanding of various contributing factors. The problem is not as serious as was once believed, although there are still some indications that observed continua, extrapolated to far ultraviolet wavelengths, are energetically insuficient to cause photoionization as necessary to account for all of the broad emission lines seen in the spectra of quasars and Seyfertgalaxies. Several potential ramifications or resolutions of remaining inconsistencies are considered here. 2003 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57101816 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.18 |
| format | Artículo científico |
| id | redalyc_57101816 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Ionizing Continuum and Emission-Line Energetics of Quasars and Seyfert Galaxies G. M. MacAlpine Física, Astronomía y Matemáticas Quasars: General Galaxies: Seyfert Ultraviolet: Galaxies Quasars: Emission Lines Ionizing Continuum and Emission-Line Energetics of Quasars and Seyfert Galaxies G. M. MacAlpine Física, Astronomía y Matemáticas Quasars: General Galaxies: Seyfert Ultraviolet: Galaxies Quasars: Emission Lines There has been renewed interest in apparently discrepant energy budgets suggested by consideration of the observed ionizing continua in combination with certain broad emission-line measurements for active galactic nuclei. This discussion reviews the history for the worrisome dilemma, and the evolving situation is reexamined in light of the most recent observations along with improvements in our understanding of various contributing factors. The problem is not as serious as was once believed, although there are still some indications that observed continua, extrapolated to far ultraviolet wavelengths, are energetically insuficient to cause photoionization as necessary to account for all of the broad emission lines seen in the spectra of quasars and Seyfertgalaxies. Several potential ramifications or resolutions of remaining inconsistencies are considered here. 2003 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57101816 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.18 |
| title | Ionizing Continuum and Emission-Line Energetics of Quasars and Seyfert Galaxies |
| topic | Física, Astronomía y Matemáticas Quasars: General Galaxies: Seyfert Ultraviolet: Galaxies Quasars: Emission Lines |
| url | https://www.redalyc.org/articulo.oa?id=57101816 |