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arXiv 1506.03096astro-ph.GA
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z $\sim$ 2.4类星体宿主星系的电离外流

Ionised outflows in z $\sim$ 2.4 quasar host galaxies

S. Carniani, A. Marconi, R. Maiolino, B. Balmaverde, M. Brusa, M. Cano-Díaz, C. Cicone, A. Comastri, G. Cresci, F. Fiore, C. Feruglio, F. La Franca, V. Mainieri… 展开作者

S. Carniani, A. Marconi, R. Maiolino, B. Balmaverde, M. Brusa, M. Cano-Díaz, C. Cicone, A. Comastri, G. Cresci, F. Fiore, C. Feruglio, F. La Franca, V. Mainieri, F. Mannucci, T. Nagao, H. Netzer, E. Piconcelli, G. Risaliti, R. Schneider, O. Shemmer

摘要:

活动星系核驱动的外流被星系演化模型用来淬灭恒星的形成,并解释超大质量黑洞和它们的宿主星系之间的关系的起源。这项工作的目的是检测在发光类星体中是否存在扩展的电离外流,我们期望在恒星形成和黑洞吸积中都有最大的活动。目前,只有少数研究的基础上的空间分辨观测流出在高红移,$z>2$。我们分析了在$z\sim2.4$上用VLT的近红外积分场光谱仪SINFONI在H波段观测到的六个发光(${\rm L>10^{47} \ erg/s}$)类星体的样品。我们在$λ= 5007Å$上对[OIII]发射线进行了运动学分析。[OIII]具有复杂的气体运动学,蓝移速度为几百km/s,线宽高达1500 km/s。使用光谱测定方法,我们推断的电离流出物的大小高达$\sim$ 2千秒差距。电离流出的质量流出率、动量率和动能功率的性质与活动星系核的光度有关。随着活动星系核亮度的增加,外流速率的增加与发光活动星系核通过辐射压力驱动的快速外流推开周围气体的想法是一致的,这取决于发射的亮度。我们推导出质量流出率约为6-700 M $_{\odot}$ /年,为我们的样品,这是低于分子外流中观察到的。事实上,电离流出的物理性质显示依赖于活动星系核的光度,这是类似的分子流出,但表明电离气体的质量小于分子之一。或者,电离和分子外流之间的这种差异可以用不同的加速机制来解释。

英文摘要:

AGN-driven outflows are invoked by galaxy evolutionary models to quench star formation and to explain the origin of the relations observed locally between super massive black holes and their host galaxies. This work aims to detect the presence of extended ionised outflows in luminous quasars where we expect the maximum activity both in star formation and in black hole accretion. Currently, there are only a few studies based on spatially resolved observations of outflows at high redshift, $z>2$. We analyse a sample of six luminous (${\rm L>10^{47} \ erg/s}$) quasars at $z\sim2.4$, observed in H-band using the near-IR integral field spectrometer SINFONI at VLT. We perform a kinematic analysis of the [OIII] emission line at $λ= 5007Å$. [OIII] has a complex gas kinematic, with blue-shifted velocities of a few hundreds of km/s and line widths up to 1500 km/s. Using the spectroastrometric method we infer size of the ionised outflows of up to $\sim$2 kpc. The properties of the ionised outflows, mass outflow rate, momentum rate and kinetic power, are correlated with the AGN luminosity. The increase in outflow rate with increasing AGN luminosity is consistent with the idea that a luminous AGN pushes away the surrounding gas through fast outflows driven by radiation pressure, which depends on the emitted luminosity. We derive mass outflow rates of about 6-700 M$_{\odot}$/yr for our sample, which are lower than those observed in molecular outflows. Indeed physical properties of ionised outflows show dependences on AGN luminosity which are similar to those of molecular outflows but indicating that the mass of ionised gas is smaller than that of the molecular one. Alternatively, this discrepancy between ionised and molecular outflows could be explained with different acceleration mechanisms.

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