棒星系NGC 1097中环核星暴环的物理性质
Physical properties of the circumnuclear starburst ring in the barred Galaxy NGC 1097
摘要：
利用亚毫米波阵对Seyfert 1/星暴环星系NGC 1097进行了高分辨率12 CO（J = 2 - 1）、13 CO（J = 2-1）和12 CO（J = 3-2）成像，研究了1 kpc环核星暴环的物理和运动学性质。用Pa_alpha谱线的HST图中的单个星团来确定恒星的形成速率，并与分子气体的性质进行了比较。在三条CO谱线中，分子环在200- 300 μ c的GMA尺度下被分解成单个的团簇。在1.5x1.0（105 x70 pc）~（12）CO（J = 2-1）图中，尘埃带与星暴环的交叉点（与轨道拥挤区有关）被分解为两个物理/运动学上截然不同的特征。与尘埃带相关的团块具有更宽的线宽，更高的表面气体密度和更低的恒星形成率，而与星暴环相关的窄线团块具有相反的特征。Toomre-Q值在环半径处小于1，表明分子环在GMA尺度下是引力不稳定的。团簇的气体质量的线宽和面密度显示出与大尺度动力学相关的方位角变化。另一方面，恒星的形成速率并不受动力学的显著影响，但与12 CO（J = 3-2）和12 CO（J = 2-1）的强度比有相关性，它追踪了与恒星形成相关的密度更大的气体。我们解决CO地图，特别是在轨道拥挤区域，第一次证明观测的物理/运动学性质的GMAs的影响，在NGC 1097的大尺度的酒吧位动力学。
英文摘要：
We report high resolution 12CO(J = 2-1), 13CO(J = 2-1), and 12CO(J = 3-2) imaging of the Seyfert 1/starburst ring galaxy NGC 1097 with the Submillimeter Array to study the physical and kinematic properties of the 1-kpc circumnuclear starburst ring. Individual star clusters as detected in the HST map of Pa_alpha line emission have been used to determine the star formation rate, and are compared with the properties of the molecular gas. The molecular ring has been resolved into individual clumps at GMA-scale of 200--300 pc in all three CO lines. The intersection between the dust lanes and the starburst ring, which is associated with orbit-crowding region, is resolved into two physically/kinematically distinct features in the 1.5x1.0 (105x70 pc) 12CO(J = 2-1) map. The clumps associated with the dust lanes have broader line width, higher surface gas density, and lower star formation rate, while the narrow line clumps associated with the starburst ring have opposite characteristics. Toomre-Q value under unity at the radius of the ring suggests that the molecular ring is gravitationally unstable to fragment at the scale of the GMA. The line widths and surface density of gas mass of the clumps show an azimuthal variation related to the large scale dynamics. The star formation rate, on the other hand, is not significantly affected by the dynamics, but has a correlation with the intensity ratio of 12CO (J = 3-2) and 12CO(J = 2-1), which traces the denser gas associated with star formation. Our resolved CO map, especially in the orbit-crowding region, for the first time demonstrates observationally that the physical/kinematic properties of the GMAs are affected by the large scale bar-potential dynamics in NGC 1097.
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