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

B. Vollmer·W. Huchtmeier
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Abstract

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 Hαplume 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 Hαplume. An additional outflow mechanism is still needed to reproduce the velocity field of the inner Hαplume. 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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B. Vollmer, W. Huchtmeier. 2003-04-08. Atomic gas far away from the Virgo cluster core galaxy NGC 4388. A possible link to isolated star formation in the Virgo cluster?. https://doi.org/10.1051/0004-6361%3A20030516

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