Virgo filaments

It is now well established that galaxies have different morphologies, gas contents, and star formation rates (SFR) in dense environments like galaxy clusters. The impact of environmental density extends to several virial radii, appear be pre-processed filaments groups before falling into the cluster. Our goal quantify this pre-processing terms content SFR, as a function cosmic filaments. We observed two first CO transitions 163 with IRAM-30 m telescope, added 82 more measurements from literature, thus forming sample 245 around Virgo gathered HI-21cm literature 69 Nançay telescope complete our sample. compare filament comparable samples cluster isolated AMIGA find clear progression field for decreasing increasing fraction quenching phase, an proportion early-type galaxies, content. Galaxies defined having SFR below one-third main sequence (MS), are only between 0% 20% sample, according local density, while they 20%–60% 30%–80% Processes lead already at play filaments; depend mostly on distance spine secondary parameter. While HI-to-stellar-mass ratio decreases by order magnitude filaments, orders respect field, decrease much less H 2 -to-stellar-mass ratio. As increases, depletion time decreases, because faster than SFR. This suggests precedes quenching.