十几个新星系被捕获：后发座星系团中的气体剥离和扩展发射线区域
A dozen new galaxies caught in the act: Gas stripping and extended emission line regions in the Coma cluster
摘要：
我们目前的图像扩展H-α云与后发座星系团的14个成员星系从深窄带成像观测与Suprime-Cam在斯巴鲁望远镜。扩展的H-α云的母星系分布在距离星团X射线发射峰值0.2 Mpc以上的地方。大多数星系的颜色比g-r大约0.5更蓝，它们占后发座星系团中心区域蓝色（g-r<0.5）明亮（r<17.8等）星系的57%。它们位于后发座星系团径向速度分布的红移和蓝移边缘附近。这些发现表明，大部分的母星系最近被后发座星系团势捕获，现在正在向星系团中心坠落，其盘气体被剥离并产生观察到的H-α云。
英文摘要：
We present images of extended H-alpha clouds associated with 14 member galaxies in the Coma cluster obtained from deep narrow band imaging observations with Suprime-Cam at the Subaru Telescope. The parent galaxies of the extended H-alpha clouds are distributed farther than 0.2 Mpc from the peak of X-ray emission of the cluster. Most of the galaxies have colors bluer than g-r approx 0.5 and they account for 57% of the blue (g-r<0.5) bright (r<17.8 mag) galaxies in the central region of the Coma cluster. They reside near the red- and blue-shifted edges of the Coma cluster's radial velocity distribution. These findings suggest that the most of the parent galaxies were recently captured by the Coma cluster potential and are now infalling toward the cluster center with their disk gas being stripped off and producing the observed H-alpha clouds.
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