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We present a study of the star-formation rate (SFR)-density relation at z ~0.9 using data drawn from the Observations of Redshift Evolution in Large ScaleEnvironments (ORELSE) survey. We find that SFR does depend on environment, butonly for intermediate-stellar mass galaxies (10^10.1 < M* / Msol < 10^10.8)wherein the median SFR at the highest densities is 0.2-0.3 dex less than atlower densities at a significance of 4 sigma. Interestingly, mass does notdrive SFR; galaxies that are more/less massive have SFRs that vary at most by~20% across all environments showing no statistically significant dependence.We further split galaxies into low-redshift (z ~ 0.8) and high-redshift (z ~1.05) subsamples and observe nearly identical behavior. We devise a simple toymodel to explore possible star-formation histories (SFHs) for galaxies evolvingbetween these redshifts. The key assumption in this model is that star-forminggalaxies in a given environment-stellar mass bin can be described as asuperposition of two exponential timescales (SFR ~ e^(-t/tau)): a long-tautimescale with tau = 4 Gyr to simulate "normal" star-forming galaxies, and ashort-tau timescale with free tau (between 0.3 < tau/Gyr < 2) to simulategalaxies on a quenching trajectory. In general we find that galaxies residingin low/high environmental densities are more heavily weighted to thelong-tau/short-tau pathways respectively, which we argue is a signature ofenvironmental quenching. Furthermore, for intermediate-stellar mass galaxiesthis transition begins at intermediate-density environments suggesting thatenvironmental quenching is relevant in group-like halos and/or cluster infallregions.

Conditional Quenching: A detailed look at the SFR-Density Relation at z ~ 0.9 from ORELSE