How do we see Narrow-Line Seyfert 1 galaxies? - Properties of emission-line regions in Narrow-Line Seyfert 1 galaxies

被引：0
|
作者：
Nagao, T [1 ]
Taniguchi, Y [1 ]
Murayama, T [1 ]
机构：
[1] Tohoku Univ, Grad Sch Sci, Astron Inst, Sendai, Miyagi 9808578, Japan
来源：
PHYSICS OF GALAXY FORMATION, PROCEEDINGS | 2001年 / 222卷
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D O I：
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Narrow-Line Seyfert 1 Galaxies (NLS1s) are not fully understood in context of the unified model of active galactic nuclei (AGN). To investigate what NLS1s are, we have compiled emission-line data from the literature. Using this data set, we found the following facts. (1) The Strength of highly ionized emission lines of NLS1s and that of normal Seyfert 1 galaxies are indistinguishable and stronger than that of Seyfert 2 galaxies statistically. This suggests the similarity of the viewing angle between NLS1s and normal Seyfert 1 galaxies. (2) Some other emission-line ratios are similar between NLS1s and the other Seyferts although NLS1s have steeper X-ray spectral energy distribution than the other types of Seyferts. We confirmed from our photoionization model calculations that this property can be understood in the framework of the photoionization scheme.
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页码：379 / 382
页数：4
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