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The Size of the longest filaments in the universe

Nov, 2003
7 pages
Published in:
  • Astrophys.J. 606 (2004) 25-31
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Abstract: (arXiv)
We analyze the filamentarity in the Las Campanas redshift survey (LCRS) and determine the length scale at which filaments are statistically significant. The largest length-scale at which filaments are statistically significant, real objects, is between 70 to 80h−180 h^{-1}Mpc, for the LCRS −3o-3^o slice. Filamentary features longer than 80h−180 h^{-1}Mpc, though identified, are not statistically significant: they arise from chance alignments. For the five other LCRS slices, filaments of lengths 50h−150 h^{-1}Mpc to 70h−170 h^{-1}Mpc are statistically significant, but not beyond. These results indicate that while individual filaments up to 80h−180 h^{-1}Mpc are statistically significant, the impression of structure on larger scales is a visual effect. On scales larger than 80h−180 h^{-1}Mpc the filaments interconnect by statistical chance to form the filament-void network. The reality of the 80h−180 h^{-1}Mpc features in the −3o-3^o slice make them the longest coherent features in the LCRS. While filaments are a natural outcome of gravitational instability, any numerical model attempting to describe the formation of large scale structure in the universe must produce coherent structures on scales that match these observations.
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