A SINFONI VIEW OF GALAXY CENTERS: MORPHOLOGY AND KINEMATICS OF FIVE NUCLEAR STAR-FORMATION RINGS
A SINFONI VIEW OF GALAXY CENTERS: MORPHOLOGY AND KINEMATICS OF FIVE NUCLEAR STAR-FORMATION RINGS
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星系中心的交响观：五个核恒星形成环的形态和运动学
DOI：
10.1088/0004-6256/135/2/479
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
S. Ryder
中科院分区：
文献类型：
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作者：
T. Böker;J. Falcón;E. Schinnerer;J. Knapen;S. Ryder
我们给出了近红外(H波段和K波段)对附近五个螺旋星系中的环核恒星形成环的积分场观测。使用SINFONI光谱仪在甚大望远镜上获得的数据被用来构建各种发射线的地图，这些地图揭示了勾勒出光环的各个恒星形成区域(“热点”)。我们推导了环的形态参数，并构造了恒星的速度场和发射线气体的速度场。基于BRγ、He I和[Fe II]发射线的强度比，我们提出了一种定性但稳健的相对热点年龄诊断方法。将这一诊断应用于这里提供的数据，初步支持了这样一种情况，即环中的恒星形成主要是在靠近星云带尘埃带和林德布莱德内部共振的交叉点附近及其下游的两个明确定义的区域触发的。
We present near-infrared (H- and K-band) integral-field observations of the circumnuclear star formation rings in five nearby spiral galaxies. The data, obtained at the Very Large Telescope with the SINFONI spectrograph, are used to construct maps of various emission lines that reveal the individual star forming regions (“hot spots”) delineating the rings. We derive the morphological parameters of the rings, and construct velocity fields of the stars and the emission line gas. We propose a qualitative, but robust, diagnostic for relative hot spot ages based on the intensity ratios of the emission lines Brγ, He i, and [Fe ii]. Application of this diagnostic to the data presented here provides tentative support for a scenario in which star formation in the rings is triggered predominantly at two well-defined regions close to, and downstream from, the intersection of dust lanes along the bar with the inner Lindblad resonance.