供给和遮蔽NGC1068活性核的分子气体流
Molecular gas streamers feeding and obscuring the active nucleus of NGC1068
摘要：
我们报道了利用SINFONI近红外积分场光谱仪在<30 pc尺度上对NGC 1068核中中性分子气体流的首次直接观测。在0.075”分辨率下，2.12 $μ$ m1 -0 S（1）分子氢辐射通量图显示了活动星系核的南北两个明显的线性结构。这些特征中气体的运动学主要由非圆形运动控制，表明物质以高度椭圆或抛物线的轨迹流向核，其方向与星系盘平面的方向一致。我们将这些数据解释为向中部地区提供天然气的证据。从~30秒差距到距核数秒差距的径向输送速率为~15 M $_\sun$/年$^{-1}$。其中一片下落的云就在中央发动机的正前方。我们将其解释为一个潮汐中断流光，形成了光学厚的外部的无定形clustrial分子/尘埃结构，这有助于核遮蔽。
英文摘要：
We report the first direct observations of neutral, molecular gas streaming in the nucleus of NGC1068 on scales of <30 pc using SINFONI near-infrared integral field spectroscopy. At a resolution of 0.075", the flux map of 2.12 $μ$m 1-0 S(1) molecular hydrogen emission around the nucleus in the central arcsec reveals two prominent linear structures leading to the AGN from the north and south. The kinematics of the gas in these features are dominated by non-circular motions and indicate that material is streaming towards the nucleus on highly elliptical or parabolic trajectories whose orientations are compatible with that of the disk plane of the galaxy. We interpret the data as evidence for fueling of gas to the central region. The radial transport rate from ~30 pc to a few parsec from the nucleus is ~15 M$_\sun$ yr$^{-1}$. One of the infalling clouds lies directly in front of the central engine. We interpret it as a tidally disrupted streamer that forms the optically thick outerpart of an amorphous clumpy molecular/dusty structure which contributes to the nuclear obscuration.
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