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Discovery of Very Extended Emission-Line Region around the Seyfert 2 Galaxy NGC 4388 | | Michitoshi Yoshida
; Masafumi Yagi
; Sadanori Okamura
; Kentaro Aoki
; Youichi Ohyama
; Yutaka Komiyama
; Naoki Yasuda
; Masanori Iye
; Nobunari Kashikawa
; Mamoru Doi
; Hisanori Furusawa
; Masaru Hamabe
; Masahiko Kimura
; Masayuki Miyazaki
; Satoshi Miyazaki
; Fumiaki Nakata
; Masami Ouchi
; Maki Sekiguchi
; Kazuhiro Shimasaku
; Hiroshi Ohtani
; | | Date: |
22 Oct 2001 | | Subject: | astro-ph | | Affiliation: | 1,2), Youichi Ohyama , Yutaka Komiyama , Naoki Yasuda , Masanori Iye , Nobunari Kashikawa , Mamoru Doi , Hisanori Furusawa , Masaru Hamabe , Masahiko Kimura , Masayuki Miyazaki , Satoshi Miyazaki , Fumiaki Nakata , Masami Ouchi , Maki Sekiguchi , Kazu | | Abstract: | We found a very large, 35 kpc, emission-line region around the Seyfert type 2 galaxy NGC 4388, using deep narrow-band imaging with the prime focus camera (Suprime-Cam) of the Subaru telescope. This region consists of many faint gas clouds or filaments, and extends northeastwards from the galaxy. The typical H-alpha luminosity L(H-alpha) of the clouds is 10^37 erg s^-1, and the total L(H-alpha) of the region within 10 kpc from the nucleus is 2 x 10^38 erg s^-1, which corresponds to an ionized gas mass of 10^5 M_solar. The map of the emission-line intensity ratio I([OIII])/I(H-alpha) indicates that the inner (r < 12 kpc) region of the VEELR may be excited by nuclear ionizing radiation. The excitation mechanism of the outer (r > 12 kpc) region is unclear, but it is likely that the nuclear radiation is also a dominant source of its ionization. We discuss the origin of the ionized gas. Two plausible origins of the gas in the VEELR are (i) the tidal debris resulting from a past interaction with a gas-rich dwarf galaxy, i.e., a minor merger, or (ii) the interstellar medium of NGC 4388, stripped by the ram pressure of the hot intracluster medium of the Virgo cluster. | | Source: | arXiv, astro-ph/0110473 | | Services: | Forum | Review | PDF | Favorites | |
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