Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-12-21
Nature 380 (1996) 603-606
Astronomy and Astrophysics
Astrophysics
9 pages, gzipped uuencoded postscript file, 4 figures in separate files. The text + figures are also available from anonymous
Scientific paper
10.1038/380603a0
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. We present a simple quantitative explanation of why this is so, showing that the final-state web is actually present in embryonic form in the overdensity pattern of the initial fluctuations, with nonlinear dynamics just sharpening the image. The web is largely defined by the position and primordial tidal fields of rare events in the medium, with the strongest filaments between nearby clusters whose tidal tensors are nearly aligned. Applications of the cosmic web theory to observations include probing cluster-cluster bridges by weak gravitational lensing, X-rays, and the Sunyaev-Zeldovich effect and probing high redshift galaxy-galaxy bridges by low column density Lyman alpha absorption lines.
Bond Richard J.
Kofman Lev
Pogosyan Dmitri
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