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Paper: Very Extended Emission-Line Region around the Seyfert 2 Galaxy NGC 4388
Volume: 289, The Proceedings of the IAU 8th Asian-Pacific Regional Meeting, Volume I
Page: 337
Authors: Yoshida, M.; Yagi, M.; Okamura, S.; Aoki, K.; Ohyama, Y.; Komiyama, Y.; Yasuda, N.; Iye, M.; Kashiawa, N.; Doi, M.; Furusawa, H.; Hamabe, M.; Kimura, M.; Miyazaki, M.; Miyazaki, S.; Nakata, F.; Ouchi, M.; Sekiguchi, M.; Shimasaku, K.; Ohtani, H.
Abstract: We found a very large, about 35 kpc, emission-line region (VEELR) around the Seyfert type 2 galaxy NGC 4388, using deep narrow-band imaging with the Suprime-Cam of the Subaru telescope. This region consists of many faint gas clouds or filaments, and extends northeastwards from the galaxy. The total ionized gas mass calculated from the L_Hα is about 4 x 10^6 f_v ^{-1/2} M_o. Deep spectroscopy of the VEELR suggests that most of the clouds in the VEELR is ionized by the nuclear ionizing radiation. Shock heating plays an important role in ionizing some VEELR clouds outside the nuclear radiation cone. The velocity field of the VEELR is complicated and almost all the clouds are blue-shifted ralative to the galaxy. Most plausible origin of the VEELR gas is the interstellar medium of NGC 4388, stripped by the ram pressure of the hot intracluster medium of the Virgo cluster. The VEELR may provide us an important clue to investigate the evolutional link between galaxy activity and ram pressure stripping.
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