Observations indicate galaxies are distributed in a filament-dominated web-like structure. Numerical experiments at high and low redshift of viable structure formation theories also show filament-dominance. The final-state web is shown to be actually present in embryonic form in the overdensity pattern of the initial fluctuations, and is largely defined by the position and primordial tidal fields of rare events in the medium, with the strongest filaments between nearby peaks (clusters at low redshift, galaxies at high redshift) whose tidal tensors are nearly aligned. The web theory is used to craft N-body and hydrodynamical simulations which confront observations probing low redshift cluster-cluster bridges by weak gravitational lensing and the Sunyaev-Zeldovich effect.
American Astronomical Society Meeting Abstracts
- Pub Date:
- December 1996