The density of the narrow-line region of type 1 Active Galactic Nuclei
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2008
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| _version_ | 1876437526446604288 |
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| author | Dawei Xu |
| author_facet | Dawei Xu |
| contents | The density of the narrow-line region of type 1 Active Galactic Nuclei Dawei Xu Hongyan Zhou Stefanie Komossa Física, Astronomía y Matemáticas galaxies: ISM Galaxies: active galaxies: Seyfert galaxies: emission lines We utilize the diagnostic power of the [S II] λλ6716,6731 intensity ratio to measure the density of the narrowline region (NLR) systematically for a large sample of narrow-line Seyfert 1 (NLS1) galaxies, and we perform a comparison with a sample of broad-line Seyfert 1 (BLS1) galaxies. The key detection is the discovery of a"zone of avoidance" in density in the sense that AGN with broad lines (FWHM(Hβ) > 2000kmsֿ¹) avoid lowdensities, while NLS1 galaxies show a wider distribution in the NLR density, including a significant numberof objects with low densities. A correlation analysis further shows that the Eddington ratio L/Ledd anticorrelates with density. We tentatively favor the effects of winds/outflows, stronger in NLS1 galaxies than in BLS1 galaxies, to explain the observed trends. 2008 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57103231 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.32 |
| format | Artículo científico |
| id | redalyc_57103231 |
| institution | Redalyc |
| language | en |
| publishDate | 2008 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | The density of the narrow-line region of type 1 Active Galactic Nuclei Dawei Xu Física, Astronomía y Matemáticas galaxies: ISM Galaxies: active galaxies: Seyfert galaxies: emission lines The density of the narrow-line region of type 1 Active Galactic Nuclei Dawei Xu Hongyan Zhou Stefanie Komossa Física, Astronomía y Matemáticas galaxies: ISM Galaxies: active galaxies: Seyfert galaxies: emission lines We utilize the diagnostic power of the [S II] λλ6716,6731 intensity ratio to measure the density of the narrowline region (NLR) systematically for a large sample of narrow-line Seyfert 1 (NLS1) galaxies, and we perform a comparison with a sample of broad-line Seyfert 1 (BLS1) galaxies. The key detection is the discovery of a"zone of avoidance" in density in the sense that AGN with broad lines (FWHM(Hβ) > 2000kmsֿ¹) avoid lowdensities, while NLS1 galaxies show a wider distribution in the NLR density, including a significant numberof objects with low densities. A correlation analysis further shows that the Eddington ratio L/Ledd anticorrelates with density. We tentatively favor the effects of winds/outflows, stronger in NLS1 galaxies than in BLS1 galaxies, to explain the observed trends. 2008 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57103231 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.32 |
| title | The density of the narrow-line region of type 1 Active Galactic Nuclei |
| topic | Física, Astronomía y Matemáticas galaxies: ISM Galaxies: active galaxies: Seyfert galaxies: emission lines |
| url | https://www.redalyc.org/articulo.oa?id=57103231 |