松散星系群中的星系相互作用：KAT-7和VLA HI对IC 1459星系群的观测
Galaxy interactions in loose galaxy groups: KAT-7 and VLA HI Observations of the IC 1459 group
摘要：
我们报告的结果，从深HI观测，进行了卡鲁阵列望远镜和卡尔G。Jansky甚大阵是以早期型星系IC 1459为中心的松散星系群。从我们的观测的主要结果是检测到一个几乎连续的，500 kpc长的HI尾巴，穿过整个集团。澳大利亚望远镜紧凑阵列的早期观测显示，在这个星系群中存在一个大的HI尾巴，但由于新数据的覆盖范围更大，现在可以看到这个尾巴的全部范围。该结构的HI质量为3.1 +- 0.3 × 10^9 Msun。基于其形态和运动学，我们得出结论，尾部由气体剥离NGC 7418通过潮汐相互作用，冲压压力的影响发挥最多的次要作用。IC 1459星系群的光学图像并没有显示出许多迹象表明星系间的相互作用在这个星系群中很常见。HI数据揭示了一个非常不同的图像，并显示IC 1459群中几乎所有富含气体的星系都有扭曲的HI分布，这表明该群中发生了许多相互作用。如此多的相互作用表明，驱动星系转变的过程也发生在相当松散的星系群中。
英文摘要：
We report on the results from deep HI observations, performed with the Karoo Array Telescope and with the Karl G. Jansky Very Large Array of the loose galaxy group centred on the early-type galaxy IC 1459. The main result from our observations is the detection of a nearly continuous, 500-kpc long HI tail which crosses the entire group. Earlier observations with the Australia Telescope Compact Array had shown the presence of a large HI tail in this galaxy group, but because of the much larger coverage of the new data, the full extent of this tail is now visible. The HI mass of this structure is 3.1 +- 0.3 10^9 Msun . Based on its morphology and kinematics, we conclude that the tail consists of gas stripped from NGC 7418 through tidal interactions, with ram-pressure affects playing at most a minor role. Optical images of the IC 1459 group do not show many indications that galaxy interactions are common in this group. The HI data reveal a very different picture and show that almost all gas-rich galaxies in the IC 1459 group have a distorted HI distribution indicating that many interactions are occurring in this group. This high number of interactions shows that the processes that drive galaxy transformation are also occurring in fairly loose galaxy groups.
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