Are the filaments real?

Details Are the filaments real? Are the filaments real?

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331l..63b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 331, Aug. 15, 1988, p. L63-L68.

Statistics

Computation

60

Galactic Clusters, Galactic Evolution, Intergalactic Media, Spatial Distribution, Computational Astrophysics, Gravitational Effects, Red Shift, Sky Surveys (Astronomy), Statistical Analysis

Scientific paper

The extent to which two selection effects, visual bias and random accidents, enter into the perception of filaments in the CfA catalog is investigated. The minimal spanning tree (MST) algorithm is used to identify the filaments, and a data-permuting technique is used to determine their statistical significance. The suitability of the MST for this purpose is demonstrated. It is found that the filaments are not accidental alignments or illusions; they disappear when the small-amplitude correlations at large scale lengths are removed. This is the first objective, statistical evidence for the physical existence of the filaments.

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