Resolving the Nuclear Obscuring Disk in the Compton-thick Seyfert Galaxy NGC 5643 with ALMA-猫眼课题宝

DOI：

10.3847/1538-4357/aabe30

发表时间：

2018-04

期刊：

The Astrophysical Journal

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通讯作者：

中科院分区：

其他

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作者：

A. Alonso-Herrero;A. Alonso-Herrero;M. Pereira-Santaella;S. Garcia-Burillo;R. Davies;F. Combes;D. Asmus;D. Asmus;A. Bunker;T. Díaz-Santos;P. Gandhi;O. González-Martín;A. Hernán-Caballero;E. Hicks;S. Hönig;Á. Labiano;N. Levenson;C. Packham;C. R. Almeida;C. R. Almeida;C. Ricci;C. Ricci;C. Ricci;D. Rigopoulou;D. Rosario;E. Sani;Martin P. Ward

利用阿尔马6波段12 CO（2-1）谱线和静止标架对附近康普顿厚度的Seyfert星系NGC 5643进行了232 GHz连续谱观测，角分辨率为0.“11-0.”26（9- 2 - 1 pc）. CO（2-1）积分线图显示了来自核和环核区域的辐射，每侧延伸10″的双臂核螺旋。环核CO（2-1）的运动学可以用旋转圆盘拟合，尽管存在具有大的剩余速度和/或速度分散的区域。CO（2-1）线剖面显示两种不同的速度分量。一个归因于环形分量，另一个归因于活动星系核流出物（由[O iii]λ5007 π辐射跟踪）与距活动星系核几百秒差距的盘中分子气体的相互作用。在核尺度上，我们检测到一个倾斜的CO（2-1）盘（直径26 pc，半高宽），几乎在南北方向取向。CO（2-1）核运动学可以用一个相对于大尺度圆盘倾斜的旋转圆盘来拟合。在0.2 ″-0.3 ″中心有强烈的非圆运动，速度高达110 km s−1。在没有核棒的情况下，这些运动可以解释为核盘中的径向流出。我们估计核盘的总分子气体质量为M（H2）= 1.1 × 107 M，活动星系核附近的H2柱密度为N（H2）= 1.5 × 1023 cm−2（对于标准的CO到H2的转换因子）。我们解释这个核分子气体盘作为NGC 5643的遮蔽环面以及电离锥的准直结构。

We present ALMA Band 6 12CO(2–1) line and rest-frame 232 GHz continuum observations of the nearby Compton-thick Seyfert galaxy NGC 5643 with angular resolutions 0.″11–0.″26 (9–21 pc). The CO(2–1) integrated line map reveals emission from the nuclear and circumnuclear region with a two-arm nuclear spiral extending ∼10″ on each side. The circumnuclear CO(2–1) kinematics can be fitted with a rotating disk, although there are regions with large residual velocities and/or velocity dispersions. The CO(2–1) line profiles of these regions show two different velocity components. One is ascribed to the circular component and the other to the interaction of the AGN outflow, as traced by the [O iii]λ5007 Å emission, with molecular gas in the disk a few hundred parsecs from the AGN. On nuclear scales, we detected an inclined CO(2–1) disk (diameter 26 pc, FWHM) oriented almost in a north–south direction. The CO(2–1) nuclear kinematics can be fitted with a rotating disk that appears to be tilted with respect to the large-scale disk. There are strong non-circular motions in the central 0.″2–0.″3 with velocities of up to 110 km s−1. In the absence of a nuclear bar, these motions could be explained as radial outflows in the nuclear disk. We estimate a total molecular gas mass for the nuclear disk of M(H2) = 1.1 × 107 M⊙ and an H2 column density toward the location of the AGN of N(H2) ∼ 5 × 1023 cm−2, for a standard CO-to-H2 conversion factor. We interpret this nuclear molecular gas disk as the obscuring torus of NGC 5643 as well as the collimating structure of the ionization cone.

Resolving the Nuclear Obscuring Disk in the Compton-thick Seyfert Galaxy NGC 5643 with ALMA

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