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arXiv 1602.06452astro-ph.GA
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附近Seyfert Galerkin核中稠密气体的厚层和外流

Thick Disks, and an Outflow, of Dense Gas in the Nuclei of Nearby Seyfert Galaxies

Ming-Yi Lin, R. I. Davies, L. Burtscher, A. Contursi, R. Genzel, E. González-Alfonso, J. Graciá-Carpio, A. Janssen, D. Lutz, G. Orban de Xivry, D. Rosario, A. S… 展开作者

Ming-Yi Lin, R. I. Davies, L. Burtscher, A. Contursi, R. Genzel, E. González-Alfonso, J. Graciá-Carpio, A. Janssen, D. Lutz, G. Orban de Xivry, D. Rosario, A. Schnorr-Müller, A. Sternberg, E. Sturm, L. Tacconi

摘要:

我们讨论了附近塞弗特星系中心区域的致密分子气体,并报告了3个物体的新角秒分辨率的HCN(1-0)和HCO $^+$(1-0)观测结果。在NGC 3079中,由于自吸收和饱和连续吸收,谱线呈现复杂的轮廓。H $^{13}$ CN揭示了连续吸收剖面,峰值接近星系的系统速度,跟踪磁盘旋转,第二个功能与蓝色翅膀延伸到$-350$公里秒$^{-1}$,最有可能跟踪核流出。发射线的形态和光谱特性使我们能够约束稠密气体动力学。我们结合我们的运动学分析,这3个对象,以及另一个与档案数据,与以前的可比分析的4个其他对象,创建一个样本8塞弗特。在其中7个中,发射线运动学意味着$\sim$ 100 pc径向尺度上的厚盘结构,表明这种结构是常见的。我们发现环核LHCN和Mdyn之间的关系可以用10%的气体分数和气体质量和HCN光度之间的转换因子αHCN $\sim$ 10来解释。最后,采用不同的角度来探测活动星系核周围气体的物理性质,我们报告的分子线比的分析表明,在这个地区的云是没有自引力。

英文摘要:

We discuss the dense molecular gas in central regions of nearby Seyfert galaxies, and report new arcsec resolution observations of HCN(1-0) and HCO$^+$(1-0) for 3 objects. In NGC 3079 the lines show complex profiles as a result of self-absorption and saturated continuum absorption. H$^{13}$CN reveals the continuum absorption profile, with a peak close to the galaxy's systemic velocity that traces disk rotation, and a second feature with a blue wing extending to $-350$km s$^{-1}$ that most likely traces a nuclear outflow. The morphological and spectral properties of the emission lines allow us to constrain the dense gas dynamics. We combine our kinematic analysis for these 3 objects, as well as another with archival data, with a previous comparable analysis of 4 other objects, to create a sample of 8 Seyferts. In 7 of these, the emission line kinematics imply thick disk structures on radial scales of $\sim$100pc, suggesting such structures are a common occurrence. We find a relation between the circumnuclear LHCN and Mdyn that can be explained by a gas fraction of 10% and a conversion factor αHCN $\sim$ 10 between gas mass and HCN luminosity. Finally, adopting a different perspective to probe the physical properties of the gas around AGN, we report on an analysis of molecular line ratios which indicates that the clouds in this region are not self-gravitating.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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