Observational evidence of galaxy assembly bias

Abstract

We analyze the spectra of 300,000 luminous red galaxies (LRGs) with stellar masses $M_{\ast }\gtrsim 10^{11}{M}_{\odot }$ from the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS). By studying their star-formation histories, we find two main evolutionary paths converging into the same quiescent galaxy population at $z\sim 0.55$. Fast-growing LRGs assemble $80\%$ of their stellar mass very early on ($z\sim 5$), whereas slow-growing LRGs reach the same evolutionary state at $z\sim 1.5$. Further investigation reveals that their clustering properties on scales of $\sim$1-30 Mpc are, at a high level of significance, also different. Fast-growing LRGs are found to be more strongly clustered and reside in overall denser large-scale structure environments than slow-growing systems, for a given stellar-mass threshold. Our results imply a dependence of clustering on stellar-mass assembly history (naturally connected to the mass-formation history of the corresponding halos) for a homogeneous population of similar mass and color, which constitutes a strong observational evidence of galaxy assembly bias.

6 pages, 5 figures. Submitted to ApJ Letters

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