The Influence of Environment in Star Forming Galaxies with UVIT/ASTROSAT

Abstract

Tracing star formation in void and filament galaxiesWe have observed small portions of the large-scale structures (LSSs) of the Universe i.e., the voids and filaments situated 300 Mpc from us using Ultraviolet Imaging Telescope (UVIT)/AstroSat. We detected a sample of void and filament galaxies in UV and calculated their star formation rates and colors, model spectral energy distribution (SED) using multi-band fluxes, and dissected their structural properties. Our analysis reveals a dominant fraction of bluer galaxies over the red ones in the void region probed while we detected an equal number of star-forming and non star-forming galaxies in filaments. We find that the large-scale environment weakly impacts the ongoing star formation in void galaxies. Whereas our study on the filament galaxies confirms the influence of the environment on their evolution. We studied the star formation properties of a massive void galaxy, I Zw81 and found that the star formation inside the lenticular galaxy is concentrated within the central few kpc region enclosing the bar.