Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-08
Astron.Astrophys. 406 (2003) 427-434
Astronomy and Astrophysics
Astrophysics
8 pages with 7 figures. Accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20030516
We have discovered 6 10^7 M_{\odot} of atomic gas at a projected distance greater than 4' (20 kpc) from the highly inclined Virgo spiral galaxy NGC 4388. This gas is most probably connected to the very extended H\alpha plume detected by Yoshida et al. (2002). Its mass makes a nuclear outflow and its radial velocity a minor merger as the origin of the atomic and ionized gas very unlikely. A numerical ram pressure simulation can account for the observed HI spectrum and the morphology of the H\alpha plume. An additional outflow mechanism is still needed to reproduce the velocity field of the inner H\alpha plume. The extraplanar compact HII region recently found by Gerhard et al. (2002) can be explained as a stripped gas cloud that collapsed and decoupled from the ram pressure wind due to its increased surface density. The star-forming cloud is now falling back onto the galaxy.
Huchtmeier Walter
Vollmer Bernd
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