Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-22
Astronomy and Astrophysics
Astrophysics
15 pages, 7 figures, ApJ accepted
Scientific paper
10.1086/338353
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.
Aoki Kentaro
Doi Mamoru
Furusawa Hisanori
Hamabe Masaru
Iye Masanori
No associations
LandOfFree
Discovery of Very Extended Emission-Line Region around the Seyfert 2 Galaxy NGC 4388 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Discovery of Very Extended Emission-Line Region around the Seyfert 2 Galaxy NGC 4388, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery of Very Extended Emission-Line Region around the Seyfert 2 Galaxy NGC 4388 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-232793