X-ray study for the Unified Seyfert Model and evolution of AGN

统一 Seyfert 模型和 AGN 演化的 X 射线研究

• 批准号: 07454040
• 负责人: AWAKI Hisamitsu
• 金额: $ 4.1万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454040/
• 关键词: X-ray; AGN; Unified Model; evolution; スターバースト; X線; スターバースト銀河

Our motivations for this research are to examine the Unified Seyfert model and to reveal an evolutional link between Seyfert galaxies and Starburst galaxies.1)examination of the Unified SeyfertmodelIn the unified Seyfert model, Seyfert 2 galaxies have the same nuclei as those of Seyfert 1 galaxies, and the nuclei are obscured by surrounding matter. The Japanese X-ray sattelite Ginga found several Seyfert 2 galaxies which X-ray spectra could be well explained by the mode. However, it is still unclear whether the model can be applied for all Seyfert 2 galaxies. We made non X-ray bias sample in order to resolve this problem, then we observed them with the Japanese X-ray satellite ASCA.We found obscured nuclei from all of our targets, and their luminosities were similar to those of Seyfer 1 galaxies as predicted by the unified Seyfert model. We studied the disctribution of column density of the obscuring matter, then found that Seyfert 2 galaxies have similar clumn density of 10^<23> cm^<-2> each other.2)evolution of AGNAn evolutional scenario of active galactic nucleus were proposed by Sanders. In order to examine this scenario, we observed Seyfert 2 galaxied with weak activity and composite type of Seyfert and starburst activities with ASCA.We found that the spectral property was quite similar to that of starburst galaxy or LINER.Recent optical observations suggests that these galaxies except for NGC1667, should be classified into LINER.Our observations and the optical identification indicate that previous classification were not complete.

我们的研究目的是检验统一Seyfert模型，揭示Seyfert星系和星暴星系之间的演化联系。1）统一Seyfert模型的检验在统一Seyfert模型中，Seyfert 2星系和Seyfert 1星系具有相同的核，并且核被周围的物质所掩盖。日本的X射线卫星Ginga发现了几个Seyfert 2星系，它们的X射线光谱可以很好地用该模式解释。然而，目前还不清楚该模型是否适用于所有的塞弗特2星系。为了解决这一问题，我们制作了无X射线偏差的样品，并用日本的X射线卫星ASCA对它们进行了观测，在所有的目标星系中都发现了被遮蔽的核，它们的光度与统一的Seyfert模型预测的Seyfer 1星系的光度相似。我们研究了暗物质柱密度的差异，发现Seyfert 2星系的柱密度相近，均为10^<23>cm^<-2>。2）活动星系核的演化Sanders提出了活动星系核的演化方案。为了验证这一假设，我们观测了弱活动的Seyfert 2星系，发现它的光谱性质与星暴星系或LINER的光谱性质非常相似。最近的光学观测表明，除NGC1667外，这些星系都应归入LINER。我们的观测和光学鉴别表明，以前的分类是不完整的。

项目成果

H.Matsumoto: "Discovery of an Abundance Gradient in the Central Region of the Virg cluste" Publ.Astron.Soc.Japan. 48. 201-210 (1996)

H.Matsumoto：“处女座中央区域丰度梯度的发现”Publ.Astron.Soc.Japan。

K.Iwasawa et al.: "An IRAS-selected Seyfert 2 galaxy IRAS 18325-5926 : the X-ray source and nuclear obscuration" Astron.J.110. 551-558 (1995)

K.Iwasawa 等人：“IRAS 选择的 Seyfert 2 星系 IRAS 18325-5926：X 射线源和核遮蔽”Astron.J.110。

H. Matsumoto: "Discovery of an Abundance Gradient in the Central Region of the Virgo Cluster" Publication of the Astronomical Society of Japan. (in press). (1996)

H. Matsumoto：“室女星团中央区域的丰度梯度的发现”，日本天文学会出版物。

H.Matsumoto et al.: "X-ray property of Early-type galaxies as observed with ASCA" Astrophys.J.482. 133-142 (1997)

H.Matsumoto 等人：“用 ASCA 观察到的早期型星系的 X 射线特性”Astrophys.J.482。

H.Awaki et al.: "X-ray Imaging Spectroscopy of Stephan's Quintet and Seyfert 2 galaxy NGC 7319" Publ.Astron.Soc.Japan. 49. 445-452 (1997)

H.Awaki 等人：“斯蒂芬五重奏和 Seyfert 2 星系 NGC 7319 的 X 射线成像光谱”Publ.Astron.Soc.Japan。