当地Seyfert Galerkin中潮汐相互作用的普遍性：对照试验
Prevalence of Tidal Interactions among Local Seyfert Galaxies: The Control Experiment
摘要：
我们测试是否有观察到的潮汐相互作用和Seyfert活动之间的关系，通过在HI 20个不活跃的星系成像在相同的空间分辨率和检测阈值的Seyfert样本。这个不活跃星系的对照样本在哈勃类型、大小和倾角上都非常匹配，并且与塞弗特星系的光学光度大致相当。我们发现，在我们的控制样本中，只有~15%的星系在HI中受到干扰，而其余的~85%在HI中没有任何干扰。即使在~10千秒差距的空间分辨率，后者的星系没有明显的HI干扰让人想起潮汐功能。在一篇配套论文（Kuo et al. 2008）中，我们报告了第一次在氢原子（HI）气体中对塞弗特星系进行系统成像调查的结果。我们发现，只有28%的18个塞弗特星系的样本中可见光星光干扰。相比之下，在大于20 kpc的星系尺度上，同样的赛弗特星系中，约94%的星系在空间上和运动学上都受到了HI气体的干扰。在至少~67%和可能高达~94%的情况下，观测到的扰动可以追溯到在HI中也检测到的与邻近星系的潮汐相互作用。观察到的流行HI干扰的塞弗特和控制样本之间的显着对比暗示潮汐相互作用引发的事件，导致发光的塞弗特活动在很大一部分的本地盘星系。
英文摘要：
We test whether there is a relation between the observed tidal interactions and Seyfert activity by imaging in HI twenty inactive galaxies at the same spatial resolution and detection threshold as the Seyfert sample. This control sample of inactive galaxies were closely matched in Hubble type, range in size and inclination, and have roughly comparable galaxy optical luminosity to the Seyfert galaxies. We find that only ~15% of the galaxies in our control sample are disturbed in HI, whereas the remaining ~85% show no disturbances whatsoever in HI. Even at a spatial resolution of ~10 kpc, none of the latter galaxies show appreciable HI disturbances reminiscent of tidal features. In a companion paper (Kuo et al. 2008), we report results from the first systematic imaging survey of Seyfert galaxies in atomic hydrogen (HI) gas. We find that only ~28% of the eighteen Seyfert galaxies in that sample are visibly disturbed in optical starlight. By contrast, ~94% of the same Seyfert galaxies are disturbed spatially and usually also kinematically in HI gas on galactic scales of >~20 kpc. In at least ~67% and up to perhaps ~94% of cases, the observed disturbances can be traced to tidal interactions with neighboring galaxies detected also in HI. The dramatic contrast between the observed prevalence of HI disturbances in the Seyfert and control samples implicates tidal interactions in initiating events that lead to luminous Seyfert activity in a large fraction of local disk galaxies.
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