SAMI星系巡天：面外气体、星系风及其与恒星形成历史的关系
The SAMI Galaxy Survey: extraplanar gas, galactic winds, and their association with star formation history
摘要：
我们调查了一个样本的40个本地，主序星，边缘盘星系使用积分场光谱与悉尼-AAO多目标积分场光谱仪（SAMI）星系巡天，以了解属性的面外气体和它们的宿主星系之间的联系。面外气体的运动学性质，包括速度不对称性和增加的色散，被用来区分星系托管大规模的星系风从那些占主导地位的扩展弥漫电离气体。我们发现，而不是弥漫的气体为主，以风为主的星系存在的光谱。风主导星系的恒星形成率（$-1 \lesssim \log({\rm SFR/M_{\odot} yr^{-1}}) \lesssim 0.5$）跨越了样本的整个恒星质量范围（$8.5 \lesssim \log({\rm M_{*}/M_{\odot}}) \lesssim 11$）。风星系的SFR表面密度（$10^{-3} \textrm{--} 10^{-1.5}\rm~M_{\odot} ~yr^{-1}~kpc^{-2}$）也有很大的范围，远低于$\rm0.1~M_{\odot} ~yr^{-1}~kpc^{-2}$的正则阈值。风星系的平均SFR表面密度和$\rm Hδ_A$值都比没有强风特征的高。增强的$\rm Hδ_A$表明，最近的恒星形成爆发是驱动大规模星系风的必要条件。我们证明了与斯隆数字巡天数据，具有高SFR表面密度的星系经历了恒星形成的爆发在最近的过去。我们的研究结果表明，我们的研究中揭示的星系风确实是由恒星形成的爆发驱动的，因此在时域中探测恒星形成对于发现和理解星系风至关重要。
英文摘要：
We investigate a sample of 40 local, main-sequence, edge-on disc galaxies using integral field spectroscopy with the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey to understand the link between properties of the extraplanar gas and their host galaxies. The kinematics properties of the extraplanar gas, including velocity asymmetries and increased dispersion, are used to differentiate galaxies hosting large-scale galactic winds from those dominated by the extended diffuse ionized gas. We find rather that a spectrum of diffuse gas-dominated to wind dominated galaxies exist. The wind-dominated galaxies span a wide range of star formation rates ($-1 \lesssim \log({\rm SFR/M_{\odot} yr^{-1}}) \lesssim 0.5$) across the whole stellar mass range of the sample ($8.5 \lesssim \log({\rm M_{*}/M_{\odot}}) \lesssim 11$). The wind galaxies also span a wide range in SFR surface densities ($10^{-3} \textrm{--} 10^{-1.5}\rm~M_{\odot} ~yr^{-1}~kpc^{-2}$) that is much lower than the canonical threshold of $\rm0.1~M_{\odot} ~yr^{-1}~kpc^{-2}$. The wind galaxies on average have higher SFR surface densities and higher $\rm Hδ_A$ values than those without strong wind signatures. The enhanced $\rm Hδ_A$ indicates that bursts of star formation in the recent past are necessary for driving large-scale galactic winds. We demonstrate with Sloan Digital Sky Survey data that galaxies with high SFR surface density have experienced bursts of star formation in the recent past. Our results imply that the galactic winds revealed in our study are indeed driven by bursts of star formation, and thus probing star formation in the time domain is crucial for finding and understanding galactic winds.
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