A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE)

As part of the Virgo Cluster Survey Tracing Ionised Gas Emission, a blind narrow-band H ? +[NII] imaging survey cluster carried out with MegaCam at CFHT, we discovered eight massive (10 10 ? M star 11 ? ) lenticular galaxies prominent ionised gas emission features in their inner (a few kiloparsec) regions. These are either filaments similar to those observed cooling flows (two galaxies), or they thin discs sizes 0.7 R (H )?2.0 kpc (six thus significantly smaller than stellar disc ( )?7 ? 22% iso r )). The morphological properties these dust seen absorption high-resolution HST images. Using unique set multifrequency data, including new archival ASTROSAT/UVIT, GALEX, HST, Spitzer , and Herschel combined IFU (MUSE, ALMA) long-slit (SOAR) spectroscopy, show that while is located within photoionised by young stars, which signals ongoing formation, filamentary structures shock ionised. formation surface brightness late-type galaxies. Because reduced size, however, below main sequence unperturbed star-forming systems. By comparing masses measured from maps optical images, Balmer decrement, estimated fitting UV-to-far-IR spectral energy distribution target galaxies, confirm derived attenuation heavily underestimated because geometrical effects due relative absorbing emitting stars. We also have gas-to-dust ratios G / D ? 80 30 320 follows Schmidt relation, but an efficiency factor ?2.5. our discuss possible origin objects, suggests multiple complex scenarios for clusters.