Authors: Masafumi Yagi, Michitoshi Yoshida, Yutaka Komiyama, Nobunari Kashikawa, Hisanori Furusawa, Sadanori Okamura, Alister W. Graham, Neal A. Miller, David Carter, Bahram Mobasher, Shardha Jogee
Abstract: We present images of extended Hα clouds associated with 14 galaxies in the Coma cluster that were obtained from deep narrow band imaging observations with Suprime-Cam at the Subaru Telescope. The parent galaxies of the extended Hα clouds are distributed farther than 200 kpc from the peak of the cluster's X-ray emission. Most of the galaxies have colors bluer than (g-r) ~ 0.5 and they account for 57% of the blue (g-r < 0.5) bright (r < 17.8 mag) galaxies in the (projected) 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 Hα clouds.