GALAXY（NUGA）VII的原子核中的分子气体。NGC4569，一个大尺度的棒，将气体漏斗状注入核区
Molecular gas in NUclei of GAlaxies (NUGA) VII. NGC4569, a large scale bar funnelling gas into the nuclear region
摘要：
这项工作是NUGA调查附近活动星系中CO排放的一部分。我们对室女星系团的成员星系NGC 4569进行了观测。我们分析了分子气体的分布和运动学在中心区域，我们调查了一个可能的联系，以强大的星爆目前在核。在内侧20”探测到的1.1x10^9兆太阳分子气体中，有70%集中在内侧800秒差距内，并且分布在近红外观测中看到的大尺度恒星棒上。CO分布中的空穴与发射大部分Halpha发射和蓝光的原子核一致。运动学建模在三个不同的方式，从纯粹的几何最物理。这种方法使我们能够逐步限制星系的物理性质，并最终出现一个合理的适合的分析模型的轨道在一个禁止的潜力。拟合轴对称模型表明，非圆形运动的幅度必须与圆形运动（120公里/秒）相当。拟合模型的基础上椭圆轨道，使我们能够确定与信心的单一内林德布拉德共振（ILR）的大比例尺。最后，一个模型的基础上的分析解决方案的气体粒子轨道的弱禁止的潜在约束的ILR半径再现的意见。质量流入率，然后估计和讨论的最佳拟合模型的解决方案的基础上。这个模型所隐含的引力矩能够有效地将ILR内的气体漏斗到300 pc，尽管另一种机制必须在100 pc内接管核恒星爆发。
英文摘要：
This work is part of the NUGA survey of CO emission in nearby active galaxies. We present observations of NGC4569, a member of the Virgo Cluster. We analyse the molecular gas distribution and kinematics in the central region and we investigate a possible link to the strong starburst present at the nucleus. 70% of the 1.1x10^9 Msolar of molecular gas detected in the inner 20" is found to be concentrated within the inner 800 pc and is distributed along the large scale stellar bar seen in near-infrared observations. A hole in the CO distribution coincides with the nucleus where most of the Halpha emission and blue light are emitted. The kinematics are modelled in three different ways, ranging from the purely geometrical to the most physical. This approach allows us to constrain progressively the physical properties of the galaxy and eventually to emerge with a reasonable fit to an analytical model of orbits in a barred potential. Fitting an axisymmetric model shows that the non-circular motions must be comparable in amplitude to the circular motions (120 km/s). Fitting a model based on elliptical orbits allows us to identify with confidence the single inner Lindblad resonance (ILR) of the large scale bar. Finally, a model based on analytical solutions for the gas particle orbits in a weakly barred potential constrained by the ILR radius reproduces the observations well. The mass inflow rate is then estimated and discussed based on the best fit model solution. The gravitational torques implied by this model are able to efficiently funnel the gas inside the ILR down to 300 pc, although another mechanism must take over to fuel the nuclear starburst inside 100 pc.
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