DUVET巡天：一个致密星暴盘星系中恒星形成驱动外流的分辨图
The DUVET Survey: Resolved Maps of Star Formation Driven Outflows in a Compact, Starbursting Disk Galaxy
AI总结：
本研究利用KCWI观测数据开发新方法分析星暴盘星系IRAS08339+6517的恒星形成驱动外流，发现其具有高覆盖比例，且外流速度和质量负载因子与恒星形成率面密度的关系符合能量驱动反馈模型而非动量驱动模型。
摘要：
我们利用Keck宇宙网成像仪（KCWI）的空间分辨测量数据，研究了红移$z\sim0.02$的星暴盘星系IRAS08339+6517中恒星形成驱动的外流。我们开发了一种包含多步过程的新方法，以确定是否应在每个空间像素中拟合外流，随后将发射线分解为多个成分。我们在几百秒差距的分辨率单元中，探测到速度$v_{\rm out}$从$100-600$ km s$^{-1}$变化的外流，其跨越的恒星形成率面密度$Σ_{\rm SFR}$范围约为$\sim$0.01-10 M$_\odot$ yr$^{-1}$ kpc$^{-2}$。在半光半径内约$\sim100\\%$的所有空间像素中，以及在$r_{90}$内约$\sim70\\%$的像素中均探测到外流，这表明该星暴盘星系具有很高的覆盖比例。大约$2/3$的总外流质量源自恒星形成环，该环对应于星系总面积的不到$10\\%$。我们发现$v_{\rm out}$与$Σ_{\rm SFR}$之间的关系，以及质量负载因子$η$与$Σ_{\rm SFR}$之间的关系，均与能量驱动反馈模型预期的趋势一致。我们研究了分辨率对这种关系的影响，发现在重新分箱的尺度大于$\sim500$ pc时存在更强的相关性。相反，我们没有发现与动量驱动风预测在统计上显著一致的结果。
英文摘要：
We study star formation driven outflows in a $z\sim0.02$ starbursting disk galaxy, IRAS08339+6517, using spatially resolved measurements from the Keck Cosmic Web Imager (KCWI). We develop a new method incorporating a multi-step process to determine whether an outflow should be fit in each spaxel, and then subsequently decompose the emission line into multiple components. We detect outflows ranging in velocity, $v_{\rm out}$, from $100-600$ km s$^{-1}$ across a range of star formation rate surface densities, $Σ_{\rm SFR}$, from $\sim$0.01-10 M$_\odot$ yr$^{-1}$ kpc$^{-2}$ in resolution elements of a few hundred parsec. Outflows are detected in $\sim100\%$ of all spaxels within the half-light radius, and $\sim70\%$ within $r_{90}$, suggestive of a high covering fraction for this starbursting disk galaxy. Around $2/3$ of the total outflowing mass originates from the star forming ring, which corresponds to $<10\%$ of the total area of the galaxy. We find that the relationship between $v_{\rm out}$ and the $Σ_{\rm SFR}$, as well as between the mass loading factor, $η$, and the $Σ_{\rm SFR}$, are consistent with trends expected from energy-driven feedback models. We study the resolution effects on this relationship and find stronger correlations above a re-binned size-scale of $\sim500$ pc. Conversely, we do not find statistically significant consistency with the prediction from momentum-driven winds.
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