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Galaxy evolution is driven by a variety of physical processes which arepredicted to proceed at different rates for different dark matter haloes andenvironments across cosmic times. A record of this evolution is preserved ingalaxy stellar populations, which we can access using absorption-linespectroscopy. Here we explore the large LEGA-C survey (DR3) to investigate therole of the environment and stellar mass on stellar populations at z~0.6-1.0 inthe COSMOS field. Leveraging the statistical power and depth of LEGA-C, wereveal significant gradients in D4000 and H-delta equivalent widths (EWs)distributions over the stellar mass vs environment 2D spaces for the massivegalaxy population (M>10^10 M$_{\odot}$) at z~0.6-1.0. D4000 and H-delta EWsprimarily depend on stellar mass, but they also depend on environment at fixedstellar mass. By splitting the sample into centrals and satellites, and interms of star-forming galaxies and quiescent galaxies, we reveal that thesignificant environmental trends of D4000 and H-delta EW when controlling forstellar mass are driven by quiescent galaxies. Regardless of being centrals orsatellites, star-forming galaxies reveal D4000 and H-delta EWs which dependstrongly on their stellar mass and are completely independent of theenvironment at 0.6<z<1.0. The environmental trends seen for satellite galaxiesare fully driven by the trends that hold only for quiescent galaxies, combinedwith the strong environmental dependency of the quiescent fraction at fixedstellar mass. Our results are consistent with recent predictions fromsimulations that point towards massive galaxies forming first in over-densitiesor the most compact dark matter haloes.

astrophysical journal/the astrophysical journal

The LEGA-C of nature and nurture in stellar populations of galaxies at  z~0.6-1.0: D4000 and H-delta reveal different assembly histories for  quiescent galaxies in different environments