...
首页> 外文期刊>The Astrophysical journal >FUELING ACTIVE GALACTIC NUCLEI. II. SPATIALLY RESOLVED MOLECULAR INFLOWS AND OUTFLOWS
【24h】

FUELING ACTIVE GALACTIC NUCLEI. II. SPATIALLY RESOLVED MOLECULAR INFLOWS AND OUTFLOWS

机译:感觉活跃的银河核素。二。空间解决的分子流入和流出

获取原文
   

获取外文期刊封面封底 >>

       

摘要

We analyze the two-dimensional distribution and kinematics of the stars as well as molecular and ionized gas in the central few hundred parsecs of five active and five matched inactive galaxies. The equivalent widths of the Brγ line indicate that there is no ongoing star formation in their nuclei, although recent (terminated) starbursts are possible in the active galaxies. The stellar velocity fields show no signs of non-circular motions, while the 1-0?S(1) H2 kinematics exhibit significant deviations from simple circular rotation. In the active galaxies the H2 kinematics reveal inflow and outflow superimposed on disk rotation. Steady-state circumnuclear inflow is seen in three active galactic nuclei (AGNs), and hydrodynamical models indicate it can be driven by a large-scale bar. In three of the five AGNs, molecular outflows are spatially resolved. The outflows are oriented such that they intersect, or have an edge close to, the disk, which may be the source of molecular gas in the outflow. The relatively low speeds imply the gas will fall back onto the disk, and with moderate outflow rates, they will have only a local impact on the host galaxy. H2 was detected in two inactive galaxies. These exhibit chaotic circumnuclear dust morphologies and have molecular structures that are counter-rotating with respect to the main gas component, which could lead to gas inflow in the near future. In our sample, all four galaxies with chaotic dust morphology in the circumnuclear region exist in moderately dense groups with 10-15 members where accretion of stripped gas can easily occur.
机译:我们分析了五个活跃和五个相配的非活跃星系的中央几百秒差距的恒星以及分子和离子化气体的二维分布和运动学。 Brγ线的等价宽度表明,尽管活跃星系中可能出现最近的(终止的)星暴,但它们的核中没有正在进行的恒星形成。恒星速度场没有任何非圆周运动的迹象,而1-0?S(1)H2运动学表明与简单的圆周旋转有明显的偏差。在活动星系中,H2运动学显示出流入和流出都叠加在圆盘旋转上。在三个活跃的银河核(AGN)中可以看到稳态的环状核流入,并且流体动力学模型表明它可以由大型的条带驱动。在五个AGN中的三个中,分子流出在空间上得到解决。流出物的方向应使其与圆盘相交或具有靠近圆盘的边缘,圆盘可能是流出物中分子气体的来源。相对较低的速度意味着气体将回落到磁盘上,并且具有适度的流出速率,它们只会对宿主星系产生局部影响。在两个非活动星系中检测到H2。这些表现出周围核尘埃形态混乱,并且具有相对于主要气体成分反向旋转的分子结构,这可能会在不久的将来导致气体流入。在我们的样本中,在核周围区域所有具有混沌尘埃形态的四个星系都存在于中等密度的群体中,该群体具有10-15个成员,很容易发生汽提气体的积聚。

著录项

获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号