吹散活动星系核宿主中的恒星形成（BAH）——I. 利用JWST MIRI观测温暖分子外流
Blowing star formation away in AGN Hosts (BAH) -- I. Observation of Warm Molecular Outflows with JWST MIRI
AI总结：
本研究利用JWST MIRI观测射电响AGN宿主UGC 8782，发现其核区存在温暖分子和电离气体外流，外流率最高达4.90 M/yr，能在1 Myr内清除核区气体，其动能耦合效率达2-5%，足以有效抑制恒星形成。
摘要：
我们使用詹姆斯·韦伯空间望远镜（JWST）中红外仪器（MIRI）中分辨率光谱仪（MRS）对射电响活动星系核宿主UGC 8782的观测，来绘制温暖分子和电离气体的运动学特征。数据揭示了内部2 kpc内空间可分辨的外流，这些外流在低电离气体（由[Ar ii] 6.99um发射示踪）和温暖分子气体（由H2跃迁示踪）中均可观测到。我们发现，在距离核心约900 pc处，温暖外流（198 K < T < 1000 K）的最大质量外流率为4.90 (2.04) M/yr，并估计更热气体相（T > 1000 K）的外流率高达1.22 (0.51) M/yr。这些外流能够在大约1 Myr内清除核区所有的温暖分子气体储库。推导出的分子外流动能功率对应的耦合效率达到AGN光度的2-5%，远高于AGN反馈有效抑制恒星形成所需的最低预期值。
英文摘要：
We use the James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) medium-resolution spectrometer (MRS) observations of the radio loud AGN host UGC 8782 to map the warm molecular and ionized gas kinematics. The data reveal spatially resolved outflows in the inner 2 kpc, seen in low ionization (traced by the [Ar ii] 6.99um emission) and in warm molecular gas (traced by the H2 rotational transitions). We find a maximum mass-outflow rate of 4.90 (2.04) M/yr at ~900 pc from the nucleus for the warm outflow (198 K< T< 1000 K) and estimate and outflow rate of up to 1.22 (0.51) M/yr for the hotter gas phase (T > 1000 K). These outflows can clear the entire nuclear reservoir of warm molecular gas in about 1 Myr. The derived kinetic power of the molecular outflows lead to coupling efficiencies of 2-5 percent of the AGN luminosity, way above the minimum expected to the AGN feedback be effective quenching the star formation.
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