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arXiv 1508.02702astro-ph.GA
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根据近红外IFU观测XI:NGC 2110中的进食与反馈

Feeding Versus Feedback in AGN from Near-Infrared IFU Observations XI: NGC 2110

Marlon R. Diniz, Rogemar A. Riffel, Thaisa Storchi-Bergmann, Claudia Winge

摘要:

利用Gemini NIFS获得的K波段积分场光谱,在~ 24 pc的空间分辨率和~40 km/s的光谱分辨率下,给出了Seyfert星系NGC 2110内部220 pc的气体通量分布以及气体和恒星运动学的二维映射。H2辐射在整个视场中延伸,并归因于活动星系核的X射线和/或激波的加热,而Brgamma辐射仅限于沿东南西北方向延伸的双极区域。暖分子气体和电离气体的质量分别为~1.4x10^3 Msun和~1.8x10^6 Msun。恒星运动学的速度色散达到250 km/s,旋转模式达到200 km/s。气体速度场呈现出类似的旋转模式,但也有额外的组件,我们认为流入和流出最清楚地观察到的分子气体排放。在内部70 pc之外观察到的流入与蓝移到东北的螺旋臂和另一个红移到西南的螺旋臂有关。我们估计,温暖分子气体的质量流入速率约为4.6 × 10 ^-4 Msun/年。在内部70 pc内,在H2辐射中观察到另一个运动学分量,可以解释为是由于沿东西方向的双极核流出,在温暖的H2中,质量流出速率约为4.3 × 10 ^-4 Msun/年。

英文摘要:

We present a two-dimensional mapping of the gas flux distributions, as well as of the gas and stellar kinematics in the inner 220 pc of the Seyfert galaxy NGC 2110, using K-band integral field spectroscopy obtained with the Gemini NIFS at a spatial resolution of ~24pc and spectral resolution of ~40 km/s. The H2 emission extends over the whole field-of-view and is attributed to heating by X-rays from the AGN and/or by shocks, while the Brgamma emission is restricted to a bi-polar region extending along the South-East-North-West direction. The masses of the warm molecular gas and of the ionized gas are ~1.4x10^3 Msun and ~1.8x10^6 Msun, respectively. The stellar kinematics present velocity dispersions reaching 250km/s and a rotation pattern reaching an amplitude of 200 km/s. The gas velocity fields present a similar rotation pattern but also additional components that we attribute to inflows and outflows most clearly observed in the molecular gas emission. The inflows are observed beyond the inner 70 pc and are associated to a spiral arm seen in blueshift to the North-East and another in redshift to the South-West. We have estimated a mass inflow rate in warm molecular gas of ~4.6x10^-4 Msun/year. Within the inner 70 pc, another kinematic component is observed in the H2 emission that can be interpreted as due to a bipolar nuclear outflow oriented along the East-West direction, with a mass-outflow rate of ~4.3x10^-4 Msun/year in warm H2.

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