孤立早型盘星系中的退耦气体运动学
Decoupled gas kinematics in isolated early-type disc galaxies
摘要：
我们在6米望远镜上用长缝光谱学研究了一个完全孤立的星系样品。我们发现12个星系中有7个（58 +/-14%）揭示了大尺度电离气体成分的存在，这些成分的角动量大多与恒星不同：7个星系中有5个（71 +/-17%）显示出可见的反旋转。诊断图展示了广泛的气体激发机制。我们估计了年轻恒星激发机制占主导地位的情况下的气体氧丰度，并发现电离气体具有太阳下的金属丰度。我们的结论是，来自原始宇宙学细丝的冷气体吸积不太可能用于这些物体，而来自富含气体的矮卫星的外部吸积更合适。
英文摘要：
We have studied a sample of completely isolated galaxies by means of long-slit spectroscopy at the 6-m telescope. We have found that 7 of 12 (58 +/- 14 %) galaxies have revealed a presence of large-scale ionized-gas component which angular momentum is mostly differ from stellar one: 5 of 7 (71 +/- 17 %) show a visible counterrottation. The diagnostic diagram demonstrates a wide range of gas excitation mechanism. We have estimated the gas oxygen abundance in the cases where excitation mechanism by young stars dominates and have found that ionized gas has a subsolar metallicity. We concluded that cold-gas accretion from primordial cosmological filaments is unlikely for these objects, while external accretion from dwarf gas-rich satellites is more suitable.
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