THE ORIENTATION OF THE NUCLEAR OBSCURER OF THE ACTIVE GALACTIC NUCLEI
THE ORIENTATION OF THE NUCLEAR OBSCURER OF THE ACTIVE GALACTIC NUCLEI
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DOI：
10.1088/2041-8205/725/2/l210
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
S. Shen;Z. Shao;M. Gu
中科院分区：
文献类型：
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作者：
S. Shen;Z. Shao;M. Gu
我们研究的轴比的大样本盘星系托管2型活动星系核（AGN）从斯隆数字巡天选择的分布，并将其与一个定义明确的控制样本的非活动星系。我们发现它们显着不同，2型活动星系核既表现出过剩的边缘上的对象和赤字的圆形对象。这种系统偏差不能用相对于星盘随机取向的核遮蔽物来解释。然而，与恒星盘共面的核遮蔽物也不能很好地拟合数据。通过假设核遮蔽物的张角为<$60 °，我们发现核遮蔽物与星盘之间的平均倾斜角为<$30 °就可以很好地再现观测到的轴比分布。
We examine the distribution of axis ratios of a large sample of disk galaxies hosting type 2 active galactic nuclei (AGNs) selected from the Sloan Digital Sky Survey and compare it with a well-defined control sample of non-active galaxies. We find them significantly different, where the type 2 AGNs show both an excess of edge-on objects and deficit of round objects. This systematical bias cannot be explained by a nuclear obscurer oriented randomly with respect to the stellar disk. However, a nuclear obscurer coplanar with the stellar disk also does not fit the data very well. By assuming that the nuclear obscurer having an opening angle of ∼60°, we find that the observed axis ratio distribution can be nicely reproduced by a mean tilt angle of ∼30° between the nuclear obscurer and the stellar disk.