WISDOM项目- XI。活动星系核宿主星系NGC 3169膨胀区的恒星形成效率与SITELLE和ALMA
WISDOM project -- XI. Star Formation Efficiency in the Bulge of the AGN-host Galaxy NGC 3169 with SITELLE and ALMA
摘要：
恒星形成效率（SFE）已被证明在不同的环境中会有所不同，特别是在星系的恒星爆发和星系的隆起深处。各种猝灭机制可能负责，从星系动力学的反馈活动星系核（AGN）。在这里，我们使用空间分辨的观测温暖的电离气体发射线从成像傅里叶变换光谱仪SITELLE在加拿大-法国-夏威夷望远镜（CFHT）和冷分子气体（CO（2-1））从阿塔卡马大型毫米/亚毫米阵列（ALMA）研究的超临界流体在活动星系核的主星系NGC 3169的凸起。在区分了恒星形成区和活动星系核电离区后，我们测量了空间分辨的分子气体耗尽时间（τ_dep = 1/SFE），空间分辨率为\approx 100 pc，银河系中心半径为1.8 kpc。我们确定了一个恒星形成环，其半径为1.25 \pm 0.6 kpc，平均τ_dep为0.3 Gyr。然而，在半径< 0.9 kpc时，分子气体表面密度和耗尽时间随半径减小而增加，后者在半径\approx 500 pc时达到约2.3 Gyr。基于气体运动学的分析和模拟的比较，我们确定活动星系核反馈，隆起形态和动力学的径向轮廓观察到的NGC 3169的中心区域的SFE的可能原因。
英文摘要：
The star formation efficiency (SFE) has been shown to vary across different environments, particularly within galactic starbursts and deep within the bulges of galaxies. Various quenching mechanisms may be responsible, ranging from galactic dynamics to feedback from active galactic nuclei (AGN). Here, we use spatially-resolved observations of warm ionised gas emission lines from the imaging Fourier transform spectrograph SITELLE at the Canada-France-Hawaii Telescope (CFHT) and cold molecular gas (CO(2-1)) from the Atacama Large Millimeter/sub-millimeter Array (ALMA) to study the SFE in the bulge of the AGN-host galaxy NGC 3169. After distinguishing star-forming regions from AGN-ionised regions using emission-line ratio diagnostics, we measure spatially-resolved molecular gas depletion times (τ_dep = 1/SFE) with a spatial resolution of \approx 100 pc within a galactocentric radius of 1.8 kpc. We identify a star-forming ring located at radii 1.25 \pm 0.6 kpc with an average τ_dep of 0.3 Gyr. At radii < 0.9 kpc, however, the molecular gas surface densities and depletion times increase with decreasing radius, the latter reaching approximately 2.3 Gyr at a radius \approx 500 pc. Based on analyses of the gas kinematics and comparisons with simulations, we identify AGN feedback, bulge morphology and dynamics as the possible causes of the radial profile of SFE observed in the central region of NGC 3169.
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