A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE).I. Introduction to the Survey
A. Boselli, M. Fossati, L. Ferrarese, S. Boissier, G. Consolandi, A., Longobardi, P. Amram, M. Balogh, P. Barmby, M. Boquien, F. Boulanger, J., Braine, V. Buat, D. Burgarella, F. Combes, T. Contini, L. Cortese, P. Cote,, S. Cote, J.C. Cuillandre, L. Drissen, B. Epinat

TL;DR
VESTIGE is a deep, wide-field narrow-band Halpha+[NII] imaging survey of the Virgo cluster, designed to study galaxy evolution, gas stripping, star formation, and cluster dynamics with unprecedented sensitivity and coverage.
Contribution
This paper introduces the VESTIGE survey, detailing its technical design, observational strategy, data products, and initial findings, establishing it as the deepest and largest blind narrow-band survey of a nearby galaxy cluster.
Findings
Detection of extended ionised gas tails in cluster galaxies
High sensitivity imaging revealing faint Halpha emission
Initial data shows environmental effects on galaxy gas content
Abstract
The Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) is a blind narrow-band Halpha+[NII] imaging survey carried out with MegaCam at the Canada-France-Hawaii Telescope. The survey covers the whole Virgo cluster region from its core to one virial radius (104 deg^2). The sensitivity of the survey is of f(Halpha) ~ 4 x 10^-17 erg sec-1 cm^-2 (5 sigma detection limit) for point sources and Sigma (Halpha) ~ 2 x 10^-18 erg sec^-1 cm^-2 arcsec^-2 (1 sigma detection limit at 3 arcsec resolution) for extended sources, making VESTIGE the deepest and largest blind narrow-band survey of a nearby cluster. This paper presents the survey in all its technical aspects, including the survey design, the observing strategy, the achieved sensitivity in both the narrow-band Halpha+[NII] and in the broad-band r filter used for the stellar continuum subtraction, the data reduction, calibration,…
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