Atomic gas far away from the Virgo cluster core galaxy NGC 4388 - A possible link to isolated star formation in the Virgo cluster?

被引：38
|
作者：
Vollmer, B [1 ]
Huchtmeier, W [1 ]
机构：
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2003年 / 406卷 / 02期
关键词：
galaxies : individual : NGC 4388; galaxies : interactions; galaxies : ISM; galaxies : kinematics and dynamics;
D O I：
10.1051/0004-6361:20030516
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have discovered 6 x 10(7) M. 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 Halpha 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 Halpha plume. An additional outflow mechanism is still needed to reproduce the velocity field of the inner Halpha 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.
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收藏
页码：427 / 434
页数：8
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