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We present images of extended H-alpha clouds associated with 14 membergalaxies in the Coma cluster obtained from deep narrow band imagingobservations with Suprime-Cam at the Subaru Telescope. The parent galaxies ofthe extended H-alpha clouds are distributed farther than 0.2 Mpc from the peakof X-ray emission of the cluster. Most of the galaxies have colors bluer thang-r approx 0.5 and they account for 57% of the blue (g-r<0.5) bright (r<17.8mag) galaxies in the central region of the Coma cluster. They reside near thered- and blue-shifted edges of the Coma cluster's radial velocity distribution.These findings suggest that the most of the parent galaxies were recentlycaptured by the Coma cluster potential and are now infalling toward the clustercenter with their disk gas being stripped off and producing the observedH-alpha clouds.

A dozen new galaxies caught in the act: Gas stripping and extended emission line regions in the Coma cluster