Host galaxy-active galactic nucleus alignments in the Sloan Digital Sky Survey Data Release 7
Host galaxy-active galactic nucleus alignments in the Sloan Digital Sky Survey Data Release 7
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斯隆数字巡天数据第 7 版中的宿主星系活跃星系核排列
DOI：
10.1111/j.1365-2966.2011.18531.x
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发表时间：
2011-07
影响因子：
4.8
通讯作者：
Hao, Lei
中科院分区：
文献类型：
--
作者：
Lagos, Claudia del P.;Padilla, Nelson D.;Strauss, Michael A.;Cora, Sofia A.;Hao, Lei
通过研究活动星系核（AGN）宿主的投影轴比分布，确定了斯隆数字巡天数据Release 7光谱样本中27450个I型和II型活动星系核（AGN）星系的内禀形状和取向。我们的目标是研究活动星系核和宿主星系系统之间可能的排列（例如。G.的吸积盘和星系角动量）和尘埃遮蔽的AGN类型的几何形状的影响。我们定义控制样本的非活动星系核星系，模仿的形态，颜色，光度和浓度分布的活动星系核人口，考虑到尘埃消光和变红的影响。假设AGN星系具有与其相应的控制样本相同的基本3D形状分布，我们发现，螺旋和椭圆I型AGN人口强烈倾向于正面星系，而椭圆和螺旋II型AGN人口倾向于边缘取向。这些发现排除了活动星系核主体在高置信度下的随机取向，对于I型螺旋星系（delta chi（2）约为230）和II型椭圆星系（delta chi（2）约为15），而I型椭圆星系和II型螺旋星系的信号较弱（delta chi（2）分别约为3和6）。当只考虑高[OIII]等效宽度（EW）活动星系核时，我们得到了一个更强的趋势，即II型螺旋是边缘朝上的，这表明光学样品中可能缺少> 20%的低[OIII] EW边缘朝上的II型活动星系核。银河尘埃吸收的宽线区域单独不能解释所观察到的倾角和投影轴比分布的I型和II型塞弗特星系，这意味着由一个小规模的环核环面遮蔽是必要的。这些结果有利于这样一种情况，即供给黑洞的物质的角动量至少在某种程度上保留了其原始气体源的记忆。
We determine the intrinsic shapes and orientations of 27450 types I and II active galactic nucleus (AGN) galaxies in the spectroscopic sample of the Sloan Digital Sky Survey Data Release 7 by studying the distribution of projected axial ratios of AGN hosts. Our aim is to study possible alignments between the AGN and host galaxy systems (e. g. the accretion disc and the galaxy angular momentum) and the effect of dust obscuration geometry on the AGN type. We define control samples of non-AGN galaxies that mimic the morphology, colour, luminosity and concentration distributions of the AGN population, taking into account the effects of dust extinction and reddening. Assuming that AGN galaxies have the same underlying 3D shape distribution as their corresponding control samples, we find that the spiral and elliptical type I AGN populations are strongly skewed towards face-on galaxies, while elliptical and spiral type II AGN populations are skewed towards edge-on orientations. These findings rule out random orientations for AGN hosts at high confidence for type I spirals (delta chi(2) approximate to 230) and type II ellipticals (delta chi(2) approximate to 15), while the signal for type I ellipticals and type II spirals is weaker (delta chi(2) approximate to 3 and approximate to 6, respectively). We obtain a much stronger tendency for the type II spirals to be edge-on when just high [OIII] equivalent width (EW) AGN are considered, suggesting that > 20 per cent of low [OIII] EW edge-on type II AGN may be missing from the optical sample. Galactic dust absorption of the broad-line region alone cannot explain the observed inclination angle and projected axial ratio distributions of types I and II Seyfert galaxies, implying that obscuration by a small-scale circumnuclear torus is necessary. These results favour a scenario in which the angular momentum of the material which feeds the black hole retains a memory of its original gas source at least to some small, non-negligible degree.
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影响因子：
6.5
作者：
D. Lutz;E. Sturm;R. Genzel;H. Spoon;A. Moorwood;H. Netzer;A. Sternberg
通讯作者：
D. Lutz;E. Sturm;R. Genzel;H. Spoon;A. Moorwood;H. Netzer;A. Sternberg
DOI：
10.1111/j.1365-2966.2008.13805.x
发表时间：
2008-08
影响因子：
4.8
作者：
R. Somerville;P. Hopkins;T. J. Cox;B. Robertson;L. Hernquist
通讯作者：
R. Somerville;P. Hopkins;T. J. Cox;B. Robertson;L. Hernquist
影响因子：
4.8
作者：
K. Iwasawa;A. Fabian;R. Mushotzky;W. N. Brandt;H. Awaki;H. Kunieda
通讯作者：
K. Iwasawa;A. Fabian;R. Mushotzky;W. N. Brandt;H. Awaki;H. Kunieda
影响因子：
64.8
作者：
K. Chambers;G. Miley;W. Breugel
通讯作者：
K. Chambers;G. Miley;W. Breugel
DOI：
10.1088/0004-637x/707/1/787
发表时间：
2009-11
期刊：
The Astrophysical Journal
影响因子：
--
作者：
L. Greenhill;P. T. Kondratko;J. Moran;A. Tilak
通讯作者：
L. Greenhill;P. T. Kondratko;J. Moran;A. Tilak