星系核中的分子气体（NUGA）。XI。完整的NGC4579重力力矩图：关于沙坝演化的新线索
Molecular gas in NUclei of GAlaxies (NUGA). XI. A complete gravity torque map of NGC4579: new clues on bar evolution
摘要：
我们创建了一个完整的引力力矩图的磁盘LINER/Seyfert 1.9星系NGC 4579。本文定量分析了活动星系核（AGN）附近从r~ 15 kpc到内部r~ 50 pc的角动量输运效率，并寻找了长期演化的特征。我们使用的1-0和2-1线的CO与高原德布尔干涉仪（PdBI）的一部分，核Galerkin-（NUGA）-项目获得的地图。我们从银河系的近红外（K波段）宽视场图像推导出恒星势。K波段的图像，它揭示了一个恒星酒吧，连同高分辨率HI地图的NGC 4579获得的超大阵列（VLA），使我们能够扩展到外磁盘的重力力矩分析。追踪的CO PdBI地图的气体响应的大部分遵循预期的气体流动模式，在两个内林德布拉德共振（ILR）的存在下，由杆电位诱导。我们还检测到一个椭圆形失真的内部r~ 200 pc的K波段图像。椭圆形与大比例尺条不对齐，这是动态解耦的标志。外盘的形态表明，中性气体目前堆积在由两个缠绕的螺旋臂形成的伪环中，这两个螺旋臂在形态上与棒结构分离。在外盘中，螺旋的解耦允许气体在中等规模上有效地产生净气体流入。由于长期的进化过程，共转障碍似乎被克服了。内圆盘中的气体被重力扭矩有效地漏斗化，下降到r~ 300 pc。在活动星系核附近，两个m=2的模式（条形和椭圆形）协同作用，产生的净气体流入下降到r~ 50 pc，提供了一个明确的吸烟枪证据，燃料与相关的短动力学时间尺度。
英文摘要：
We create a complete gravity torque map of the disk of the LINER/Seyfert 1.9 galaxy NGC4579. We quantify the efficiency of angular momentum transport and search for signatures of secular evolution in the fueling process from r~15kpc down to the inner r~50pc around the Active Galactic Nucleus (AGN). We use both the 1-0 and 2-1 line maps of CO obtained with the Plateau de Bure Interferometer (PdBI) as part of the NUclei of Galaxies-(NUGA)-project. We derive the stellar potential from a NIR (K band) wide field image of the galaxy. The K-band image, which reveals a stellar bar, together with a high resolution HI map of NGC4579 obtained with the Very Large Array (VLA), allow us to extend the gravity torque analysis to the outer disk. The bulk of the gas response traced by the CO PdBI maps follows the expected gas flow pattern induced by the bar potential in the presence of two Inner Lindblad Resonances (ILR). We also detect an oval distortion in the inner r~200pc of the K-band image. The oval is not aligned with the large-scale bar, a signature of dynamical decoupling. The morphology of the outer disk suggests that the neutral gas is currently piling up in a pseudo-ring formed by two winding spiral arms that are morphologically decoupled from the bar structure. In the outer disk, the decoupling of the spiral allows the gas to efficiently produce net gas inflow on intermediate scales. The corotation barrier seems to be overcome due to secular evolution processes. The gas in the inner disk is efficiently funneled by gravity torques down to r~300pc. Closer to the AGN, the two m=2 modes (bar and oval) act in concert to produce net gas inflow down to r~50pc, providing a clear smoking gun evidence of fueling with associated short dynamical time-scales.
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。
