# Cosmic web anisotropy is the primary indicator of halo assembly bias

20 Aug 2019 Ramakrishnan Sujatha IUCAA Paranjape Aseem IUCAA Hahn Oliver OCA Sheth Ravi K. UPenn/ICTP

The internal properties of dark matter haloes correlate with the large-scale halo clustering strength at fixed halo mass $-$ an effect known as assembly bias $-$ and are also strongly affected by the local, non-linear cosmic web. Characterising a halo's local web environment by its tidal anisotropy $\alpha$ at scales $\sim4$ x the halo radius, we demonstrate that these multi-scale correlations represent two distinct statistical links: one between the internal property and $\alpha$, and the other between $\alpha$ and large-scale ( $>30h^{-1}$Mpc) halo bias $b_1$... (read more)

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# Categories

• COSMOLOGY AND NONGALACTIC ASTROPHYSICS
• ASTROPHYSICS OF GALAXIES