COSMOS galaxies with ALMA 345.7GHz & 342.3GHz obs.

At this redshift, our targets span a wide range of environments allowing for a diverse sample of galaxies with densities of {Sigma}=0.16-10.5Mpc^-2^ (per {Delta}z=0.024). Using the ALMA observations, we calculate the total interstellar medium (ISM) mass (M_ISM_) and look for depletion as a function of galaxy density in order to understand the quenching or triggering of star formation in galaxies in different environments.

M_ISM_ is found to have a small dependence on the environment, while the depletion timescale remains constant (~200Myr) across all environments. We find elevated M_ISM_ values at intermediate densities and lower values at high densities compared to low (field) densities. Our observed evolution in gas fraction with density in this single redshift slice is equivalent to the observed evolution with cosmic time over 2-3Gyr.