Arp 220核外超气泡的HST/WFC3观测
HST/WFC3 Observations of an Off-Nuclear Superbubble in Arp 220
摘要：
我们提出了一个高空间分辨率的光学和红外研究的Arp 220，一个后期的星系合并的环核区域。使用HST/WFC 3的窄带成像已将先前观察到的H $α$ +[NII]发射峰解析为气泡状特征。这个特征的直径为1.6”，或600 pc，位于西核西北方仅1”。气泡与西方的核和X射线中看到的大规模流出轴对齐。我们探讨了几种可能性的泡沫起源，包括一个隐藏的活动星系核（AGN）的喷流或流出，从几百pc的核气体盘内的高水平的恒星形成的流出，或一个超亮的X射线源。根据气泡的排列和能量参数，在核的内部$\sim$ 100 pc内有一个模糊的活动星系核或高水平的恒星形成是有利的。
英文摘要：
We present a high spatial resolution optical and infrared study of the circumnuclear region in Arp 220, a late-stage galaxy merger. Narrowband imaging using HST/WFC3 has resolved the previously observed peak in H$α$+[NII] emission into a bubble-shaped feature. This feature measures 1.6" in diameter, or 600 pc, and is only 1" northwest of the western nucleus. The bubble is aligned with the western nucleus and the large-scale outflow axis seen in X-rays. We explore several possibilities for the bubble origin, including a jet or outflow from a hidden active galactic nucleus (AGN), outflows from high levels of star formation within the few hundred pc nuclear gas disk, or an ultraluminous X-ray source. An obscured AGN or high levels of star formation within the inner $\sim$100 pc of the nuclei are favored based on the alignment of the bubble and energetics arguments.
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