GALAXY（NUGA）XIII核中的分子气体。相互作用的Seyfert 2/ LINER星系NGC 5953
Molecular Gas in NUclei of GAlaxies (NUGA) XIII. The interacting Seyfert 2/LINER galaxy NGC 5953
摘要：
本文给出了用IRAM干涉仪在分辨率分别为2 \farcs 1 $\times$ 1 \farcs 4和1 \farcs 1 $\times$ 0 \farcs 7下获得的相互作用Seyfert 2/LINER星系NGC 5953的PDMATHABMMCO（1- 0）和PDMATHABMMCO（2- 1）图。CO发射分布在直径为$\sim$ 16 \arcsec（$\sim$ 2.2 kpc）的圆盘上，其中有几个随机分布的峰。最强的峰并不与核心重合，而是从中心$\sim2-3^{\prime\prime}$（$\sim$ 340 pc）向西/西南偏置。分子组分的运动学是很有规律的，这是典型的旋转圆盘。我们还比较了NGC 5953的$^{12}$ CO分布与其他波长的观测结果，以研究星际介质中不同示踪剂之间的相关性。利用近红外图像，我们计算了恒星势对气体施加的重力力矩。在$^{12}$ CO（1- 0）和$^{12}$ CO（2- 1）中，转矩主要是正的，这表明气体没有流入中心，并且在每次旋转中交换的气体角动量小于5%。这来自于星系中心的规则和几乎轴对称的总质量和气体分布。在NGC 5953中，活动星系核在当前时期显然没有被活跃地注入燃料。
英文摘要：
We present $^{12}$CO(1--0) and $^{12}$CO(2--1) maps of the interacting Seyfert 2/LINER galaxy NGC 5953 obtained with the IRAM interferometer at resolutions of 2\farcs1 $\times$ 1\farcs4 and 1\farcs1 $\times$ 0\farcs7, respectively. The CO emission is distributed over a disk of diameter $\sim$16\arcsec ($\sim$2.2 kpc), within which are several, randomly distributed peaks. The strongest peak does not coincide with the nucleus, but is instead offset from the center, $\sim2-3^{\prime\prime}$ ($\sim$340 pc) toward the west/southwest. The kinematics of the molecular component are quite regular, as is typical of a rotating disk. We also compared the $^{12}$CO distribution of NGC 5953 with observations at other wavelengths in order to study correlations between different tracers of the interstellar medium. Using NIR images, we computed the gravity torques exerted by the stellar potential on the gas. The torques are predominantly positive in both $^{12}$CO(1--0) and $^{12}$CO(2--1), suggesting that gas is not flowing into the center, and less than 5% of the gas angular momentum is exchanged in each rotation. This comes from the regular and almost axisymmetric total mass and gas distributions in the center of the galaxy. In NGC 5953, the AGN is apparently not being actively fueled in the current epoch.
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