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arXiv 0803.0240astro-ph
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具有高[ OIII ]5007蓝移的Seyfert星系的性质

On the nature of Seyfert galaxies with high [OIII]5007 blueshifts

S. Komossa, D. Xu, H. Zhou, T. Storchi-Bergmann, L. Binette

摘要:

我们研究了具有高[OIII]5007蓝移的Seyfert星系(“蓝离群者”)的性质,这些蓝离群者最初是由于它们强烈偏离正常窄线Seyfert 1(NLS 1)和宽线Seyfert 1(BLS 1)星系的M_BH -σ关系而被识别出来的。这些蓝色的异常值被证明是重要的实验台模型的窄线区(NLR),驱动大规模外流的机制,NLS 1星系和射电星系之间的联系,并为取向依赖NLS 1模型。我们报道了在每个星系中探测到的线蓝移与电离势的强相关性,包括测量径向速度高达500- 1000 km/s的日冕线。所有[OIII]蓝色离群值的宽巴耳末线宽度较窄,爱丁顿比率较高。虽然存在的非移位低电离线表示存在一个经典的外部静态NLR在蓝色离群值,我们还报告没有任何第二个,非蓝移[OIII]组件从经典的内部NLR。这些结果对NLR模型提出了严格的限制。我们倾向于一个方案,其中NLR云夹带在一个减速风,这解释了强烈的分层和没有一个零蓝移内NLR的蓝色离群值。风的起源仍然是推测在这个时候(准直无线电等离子体,热风,辐射加速云)。这可能与蓝色异常值的高爱丁顿比率有关。类似地,所有的塞弗特星系都可能存在较弱的风,但通常只会影响日冕线区域(日冕线区域),或者甚至在到达日冕线区域之前就稳定下来。简要讨论了NLS 1星系中蓝野值与(致密)射电源之间的相似性。

英文摘要:

We have studied the properties of Seyfert galaxies with high [OIII]5007 blueshifts (`blue outliers'), originally identified because of their strong deviation from the M_BH - sigma relation of normal, narrow-line Seyfert 1 (NLS1) and broad-line Seyfert 1 (BLS1) galaxies. These blue outliers turn out to be important test-beds for models of the narrow-line region (NLR), for mechanisms of driving large-scale outflows, for links between NLS1 galaxies and radio galaxies, and for orientation-dependent NLS1 models. We report the detection of a strong correlation of line blueshift with ionization potential in each galaxy, including the measurement of coronal lines with radial velocities up to 500--1000 km/s. All [OIII] blue outliers have narrow widths of their broad Balmer lines and high Eddington ratios. While the presence of non-shifted low-ionization lines signifies the presence of a classical outer quiescent NLR in blue outliers, we also report the absence of any second, non-blueshifted [OIII] component from a classical inner NLR. These results place tight constraints on NLR models. We favor a scenario in which the NLR clouds are entrained in a decelerating wind which explains the strong stratification and the absence of a zero-blueshift inner NLR of blue outliers. The origin of the wind remains speculative at this time (collimated radio plasma, thermal winds, radiatively accelerated clouds). It is perhaps linked to the high Eddington ratios of blue outliers. Similar, less powerful winds could be present in all Seyfert galaxies, but would generally only affect the coronal line region (CLR), or level off even before reaching the CLR. Similarities between blue outliers in NLS1 galaxies and (compact) radio sources are briefly discussed.

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