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arXiv 1505.00536astro-ph.GA
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从全体积有限硬X射线AGN样品的光学和X射线遮蔽对尘埃环面和中性环面的认识

Insights on the Dusty Torus and Neutral Torus from Optical and X-ray Obscuration in a Complete Volume Limited Hard X-ray AGN Sample

R. Davies, L. Burtscher, D. Rosario, T. Storchi-Bergmann, A. Contursi, R. Genzel, J. Graciá-Carpio, E. Hicks, A. Janssen, M. Koss, M. -Y. Lin, D. Lutz, W. Macie… 展开作者

R. Davies, L. Burtscher, D. Rosario, T. Storchi-Bergmann, A. Contursi, R. Genzel, J. Graciá-Carpio, E. Hicks, A. Janssen, M. Koss, M. -Y. Lin, D. Lutz, W. Maciejewski, F. Müller-Sánchez, G. Orban de Xivry, C. Ricci, R. Riffel, R. A. Riffel, M. Schartmann, A. Schnorr-Müller, A. Sternberg, E. Sturm, L. Tacconi, S. Veilleux

摘要:

我们描述了一个完整的体积有限的样本附近的活动星系选择他们的14- 195千电子伏的光度,并概述其基本原理研究调节气体流入和流出的机制。我们还描述了一个互补的样本不活跃的星系,选择匹配的活动星系核宿主星系的属性。活动样本似乎没有偏向活动星系核的类型,唯一的区别是中性吸收柱,这是两个数量级以上的塞弗特2s。在样品所跨越的光度范围内,log L_{14-195keV} [erg/s] = 42.4-43.7,光学遮蔽和X射线吸收部分为50- 65%。这些分数的相似性,更遥远的光谱AGN样品,虽然在有限的光度范围内,表明环并没有强烈的红移演变。我们的样本证实,X射线未吸收的塞弗特2是罕见的,包括不超过百分之几的塞弗特2人口。在更高的光度下,光学遮蔽部分减少(如预期的增加尘埃升华半径),但X射线吸收部分变化不大。我们认为,冷X射线吸收在这些塞弗特1的云,也有助于宽线区(BLR)的排放中性气体可以占,并建议,一个几何厚的中性气体环与BLR共存,桥梁的差距,尘埃环。

英文摘要:

We describe a complete volume limited sample of nearby active galaxies selected by their 14-195keV luminosity, and outline its rationale for studying the mechanisms regulating gas inflow and outflow. We describe also a complementary sample of inactive galaxies, selected to match the AGN host galaxy properties. The active sample appears to have no bias in terms of AGN type, the only difference being the neutral absorbing column which is two orders of magnitude greater for the Seyfert 2s. In the luminosity range spanned by the sample, log L_{14-195keV} [erg/s] = 42.4-43.7, the optically obscured and X-ray absorbed fractions are 50-65%. The similarity of these fractions to more distant spectroscopic AGN samples, although over a limited luminosity range, suggests that the torus does not strongly evolve with redshift. Our sample confirms that X-ray unabsorbed Seyfert 2s are rare, comprising not more than a few percent of the Seyfert 2 population. At higher luminosities, the optically obscured fraction decreases (as expected for the increasing dust sublimation radius), but the X-ray absorbed fraction changes little. We argue that the cold X-ray absorption in these Seyfert 1s can be accounted for by neutral gas in clouds that also contribute to the broad line region (BLR) emission; and suggest that a geometrically thick neutral gas torus co-exists with the BLR and bridges the gap to the dusty torus.

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