Ionized Gas Outflows from the MAGNUM Survey: NGC 1365 and NGC 4945
Ionized Gas Outflows from the MAGNUM Survey: NGC 1365 and NGC 4945
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MAGNUM 巡天的电离气体流出：NGC 1365 和 NGC 4945
DOI：
10.3389/fspas.2017.00046
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
F. Mannucci
中科院分区：
文献类型：
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作者：
G. Venturi;A. Marconi;M. Mingozzi;S. Carniani;G. Cresci;G. Risaliti;F. Mannucci
活动星系核反馈，通过强烈的外流加速在活动星系核主机的核区域，调用作为一个关键成分的星系演化的许多模型来解释所观察到的BH星系标度关系。最近，终于在z>1.5的类星体中发现了辐射模反馈作用的直接观测证据。然而，由于空间信息受到角分辨率的限制，不可能在小尺度（100 pc）的红移下研究类星体的外流。相反，这在附近的活动星系中是可行的，这些星系是探索外流结构和性质的理想实验室，以及AGN对其宿主星系的影响。在这一过程中，我们提出了MAGNUM调查的初步结果，其中包括附近的塞弗特星系观测的积分场摄谱仪VLT/MUSE。我们聚焦于两个源，NGC 1365和NGC 4945，它们表现出双锥形流出，距离>1 kpc。我们解开的主要贡献，观察到的各种气体成分的电离在中央$\sim$5.3千秒差距的NGC 1365。通过简单的运动学建模，试图推断出NGC 4945的外流三维结构，建议一个中空的圆锥几何形状。
AGN feedback, acting through strong outflows accelerated in the nuclear region of AGN hosts, is invoked as a key ingredient for galaxy evolution by many models to explain the observed BH-galaxy scaling relations. Recently, some direct observational evidence of radiative mode feedback in action has been finally found in quasars at $z$>1.5. However, it is not possible to study outflows in quasars at those redshifts on small scales ($\lesssim$100 pc), as spatial information is limited by angular resolution. This is instead feasible in nearby active galaxies, which are ideal laboratories to explore outflow structure and properties, as well as the effects of AGN on their host galaxies. In this proceeding we present preliminary results from the MAGNUM survey, which comprises nearby Seyfert galaxies observed with the integral field spectrograph VLT/MUSE. We focus on two sources, NGC 1365 and NGC 4945, that exhibit double conical outflows extending on distances >1 kpc. We disentangle the dominant contributions to ionization of the various gas components observed in the central $\sim$5.3 kpc of NGC 1365. An attempt to infer outflow 3D structure in NGC 4945 is made via simple kinematic modeling, suggesting a hollow cone geometry.