On Detecting Halo Assembly Bias with Galaxy Populations

  title={On Detecting Halo Assembly Bias with Galaxy Populations},
  author={Yen-Ting Lin and Rachel Mandelbaum and Yun-Hsin Huang and Hung-Jin Huang and Neal Dalal and Benedikt Diemer and Hung-Yu Jian and Andrey V. Kravtsov},
  journal={arXiv: Astrophysics of Galaxies},
The fact that the clustering of dark matter halos depends not only on their mass, but also the formation epoch, is a prominent, albeit subtle, feature of the cold dark matter structure formation theory, and is known as assembly bias. At low mass scales ($\sim 10^{12}\,h^{-1}M_\odot$), early-forming halos are predicted to be more strongly clustered than the late-forming ones. In this study we aim to robustly detect the signature of assembly bias observationally, making use of formation time… 

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