A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE).IX. The effects of ram pressure stripping down to the scale of individual HII regions in the dwarf galaxy IC 3476
A. Boselli, A. Lupi, B. Epinat, P. Amram, M. Fossati, J.P. Anderson,, S. Boissier, M. Boquien, G. Consolandi, P. Cote, J.C. Cuillandre, L., Ferrarese, L. Galbany, G. Gavazzi, J.A. Gomez-Lopez, S. Gwyn, G. Hensler, J., Hutchings, H. Kuncarayakti, A. Longobardi, E.W. Peng

TL;DR
This study reveals how ram pressure stripping in the dwarf galaxy IC 3476 causes rapid, localized changes in ionised gas and star formation, with effects observable down to individual HII regions, highlighting the violent nature of environmental interactions.
Contribution
First detailed analysis of ram pressure effects on individual HII regions in a dwarf galaxy within the Virgo cluster, combining deep imaging and hydrodynamic simulations.
Findings
Ram pressure stripping causes disturbed ionised gas morphology.
Star formation is quenched at the leading edge but enhanced in inner regions.
The perturbation is recent, occurring within ~50 Myr.
Abstract
We study the IB(s)m galaxy IC 3476 observed in the context of VESTIGE, a blind narrow-band Halpha+[NII] imaging survey of the Virgo cluster. The deep narrow-band (NB) image reveals a very pertubed ionised gas distribution, characterised by a prominent banana-shaped structure in the front of the galaxy formed of giant HII regions crossing the stellar disc, with star forming structures at ~8 kpc from the edges of the stellar disc, detected also in a deep FUV ASTROSAT/UVIT image. This particular morphology indicates that the galaxy is undergoing an almost edge-on ram pressure stripping event. The NB image also shows that the star formation activity is totally quenched in the leading edge of the disc, where the gas has been removed during the interaction. The SED fitting analysis indicates that this quenching episode is very recent (~50 Myr), and roughly corresponds to an increase of the…
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