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We present the analysis of Halpha3, an Halpha imaging survey of 409 galaxiesselected from the HI Arecibo ALFALFA Survey in the Local Supercluster,including the Virgo cluster. We explore the relations between the stellar mass,the HI mass and the current, massive SFR of nearby galaxies in the Virgocluster and we compare them with those of isolated galaxies in the LocalSupercluster, disentangling the role of the environment in shaping the starformation properties of galaxies at the present cosmological epoch. Weinvestigate the relationships between atomic neutral gas and newly formed starsin different environments, across many morphological types, and over a widerange of stellar masses adopting an updated calibration of the HI deficiencyparameter. Studying the mean properties of late-type galaxies in the LocalSupercluster, we find that galaxies in increasing local galaxy densityconditions (or decreasing projected angular separation from M87) show asignificant decrease in the HI content and in the mean specific star formationrate, along with a progressive reddening of their stellar populations. Thegradual quenching of the star formation occurs outside-in, consistently withthe predictions of the ram pressure model. Once considered as a whole, theVirgo cluster is effective in removing neutral hydrogen from galaxies, and thisperturbation is strong enough to appreciably reduce the SFR of its entiregalaxy population. An estimate of the present infall rate of 300-400 galaxiesper Gyr in the Virgo cluster is obtained from the number of existing HI-richlate-type systems, assuming 200-300 Myr as the time scale for HI ablation. Ifthe infall process has been acting at constant rate this would imply that theVirgo cluster has formed approximately 2 Gyr ago, consistently with the ideathat Virgo is in a young state of dynamical evolution.

astronomy and astrophysics

Halpha3: an Halpha imaging survey of HI selected galaxies from ALFALFA.  II. The star formation properties of galaxies in the Virgo cluster and  surroundings