AGN的长期动力外流：非并合驱动的超大质量黑洞增长的主导
Secularly powered outflows from AGN: the dominance of non-merger driven supermassive black hole growth
摘要：
最近的观测和模拟显示，在驱动超大质量黑洞（SMBH）和星系演化的增长中，长期过程比合并占主导地位。在这里，我们获得窄带成像的活动星系核动力外流的$12$星系与磁盘占主导地位的形态，其历史被认为是合并自由的样本。我们检测流出$10/12$源在窄带成像的[OIII] $5007 \unicode{x212B}$发射使用过滤器的谢恩-3米望远镜。我们计算了这些活动星系核的平均外流率为$0.95\pm0.14~\rm{M}_{\odot}~\rm{yr}^{-1}$。这超过其SMBH（$0.054\pm0.039~\rm{M}_{\odot}~\rm{yr}^{-1}$）的平均吸积速率$\sim18$倍。假设星系必须至少提供足够的物质来驱动活动星系核和外流，这就给出了$\sim1.01\pm0.14~\rm{M}_{\odot}~\rm{yr}^{-1}$的平均流入速率的下限，模拟表明，通过棒、旋臂和冷吸积可以达到这个速率。我们比较我们的磁盘为主的样本与附近的活动星系核合并为主的历史，并表明，在我们的样本中的黑洞吸积率高5倍（$4.2σ$）和流出率低5倍（$2.6σ$）。我们认为，这可能是一个结果的几何形状的平滑，平面流入长期主导的系统，这是两个旋转的黑洞，以增加吸积效率和较少的影响，从流出的反馈，比在合并驱动的系统与混沌准球形流入。这项工作提供了进一步的证据表明，长期的过程是足够的燃料SMBH的增长。
英文摘要：
Recent observations and simulations have revealed the dominance of secular processes over mergers in driving the growth of both supermassive black holes (SMBH) and galaxy evolution. Here we obtain narrowband imaging of AGN powered outflows in a sample of $12$ galaxies with disk-dominated morphologies, whose history is assumed to be merger-free. We detect outflows in $10/12$ sources in narrow band imaging of the [OIII] $5007 \unicode{x212B}$ emission using filters on the Shane-3m telescope. We calculate a mean outflow rate for these AGN of $0.95\pm0.14~\rm{M}_{\odot}~\rm{yr}^{-1}$. This exceeds the mean accretion rate of their SMBHs $0.054\pm0.039~\rm{M}_{\odot}~\rm{yr}^{-1}$) by a factor of $\sim18$. Assuming that the galaxy must provide at least enough material to power both the AGN and the outflow, this gives a lower limit on the average inflow rate of $\sim1.01\pm0.14~\rm{M}_{\odot}~\rm{yr}^{-1}$, a rate which simulations show can be achieved by bars, spiral arms and cold accretion. We compare our disk dominated sample to a sample of nearby AGN with merger dominated histories and show that the black hole accretion rates in our sample are 5 times higher ($4.2σ$) and the outflow rates are 5 times lower ($2.6σ$}. We suggest that this could be a result of the geometry of the smooth, planar inflow in a secular dominated system, which is both spinning up the black hole to increase accretion efficiency and less affected by feedback from the outflow, than in a merger-driven system with chaotic quasi-spherical inflows. This work provides further evidence that secular processes are sufficient to fuel SMBH growth.
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