Active Galactic Nucleus and Extended Starbursts in a Midstage Merger VV 114
Active Galactic Nucleus and Extended Starbursts in a Midstage Merger VV 114
复制标题
中期合并中的活跃星系核和扩展星暴 VV 114
DOI：
10.1093/pasj/65.3.l7
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发表时间：
2013
影响因子：
2.3
通讯作者：
Masatoshi Imanishi et al.
中科院分区：
文献类型：
--
作者：
Daisuke Iono;Toshiki Saito;Min S Yun;Ryohei Kawabe;Daniel Espada;Yoshiaki Hagiwara;Masatoshi Imanishi et al.
高分辨率（04）阿塔卡马大型毫米/亚毫米阵列（阿尔马）第0周期对HCO（4-3）和HCN（4-3）的观测朝向中期红外明亮合并VV 114，揭示了一个紧凑的核（200 pc）和扩展（3-4 kpc）的致密气体分布在星系对的东部。我们发现在VV 114东核中发现的一个未分辨的致密而宽的（290 km s）成分中HCN（4-3）发射显著增强，并提出与活动星系核（AGN）周围物质有关的致密气体，其质量上限为410。扩展的致密气体分布沿着一个致密结构，致密气体浓度（230 pc;10）由600 pc的平均投影距离分开，其中许多是一般一致的位置，星星形成跟踪Paemission。辐射传输的计算表明，中等密度（10- 10厘米）的气体平均在整个发射区。这些新的阿尔马观测结果表明，即使在当地宇宙中最尘埃笼罩的环境中，稠密气体示踪剂也能在星系合并中识别活动星系核和恒星形成活动。
High-resolution (04) Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 0 observations of HCO(4–3) and HCN (4–3) toward a midstage infrared bright merger, VV 114, have revealed a compact nuclear (200 pc) and extended (3–4 kpc) dense gas distribution across the eastern part of the galaxy pair. We have found a significant enhancement of HCN (4–3) emission in an unresolved compact and broad (290 km s) component found in the eastern nucleus of VV 114, and suggest dense gas associated with the surrounding material around an Active Galactic Nucleus (AGN), with a mass upper limit of410. The extended dense gas is distributed along a filamentary structure with resolved dense gas concentrations (230 pc;10) separated by a mean projected distance of600 pc, many of which are generally consistent with the location of star formation traced in Paemission. Radiative-transfer calculations suggest moderately dense (10–10cm) gas averaged over the entire emission region. These new ALMA observations demonstrate the strength of the dense gas tracers for identifying both the AGN and the star-formation activity in a galaxy merger, even in the most dust-enshrouded environment in the local universe.