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In the deep narrow band image of the Coma Cluster taken with Suprime-Cam ofthe Subaru telescope, we found an extremely long and narrow (~ 60 kpc x 2 kpc)Halpha emitting region associated with a poststarburst galaxy (D100). Follow upspectroscopy shows that the region has the same redshift as D100. The surfacebrightness of the region is typically 25 mag(AB) arcsec^-2 in Halpha, whichcorresponds to 0.5--4x10^-17 erg s^-1 cm^-2 arcsec^-2. We set two possibleexplanations for the origin of the region; gas stripped off from a mergeddwarf, or gas stripped off from D100 by ram pressure. Either scenario hasdifficulty to fully explain all the observed characteristics of the region.Comment: 6 pages, 9 figures, accepted for publication in Ap

The Remarkable 60 x 2 kpc Optical Filament Associated with a Poststarburst Galaxy in the Coma Cluster